B O N N E V I L L E P O W E R A D M I N I S T R A T I O N

2010 Level Modified Streamflow

1928 - 2008

August 2011

DOE/BP-4352

Cooperating Agencies: United States Army Corps of Engineers, United States Bureau of Reclamation

BONNEVILLE POWER ADMINISTRATION DOE/BP-4352 ▪ August 2011

Preface

The Bonneville Power Administration, in conjunction with the US Army Corp of Engineers and the US Bureau of Reclamation, is pleased to publish the 2010 edition of The Modified Streamflows for the Columbia River Basin, coastal basins of Washington and Oregon, and most of the closed basins in eastern Oregon. This was a three year effort to not only expand this critical, widely-used database nine years (1999-2008) to provide a total 80 year database (1928-2008) in this edition, but also to provide updated daily modified streamflows to facilitate better long-term planning for those studies that require daily flow data. This study could not have been done without the enthusiastic support of the Pacific Northwest Coordination Agreement (PNCA) parties. While the agreement mandates completion of this dataset at least once every ten years, their financial and technical support was critical to the completion of this project. Valuable contributions and suggestions were received form numerous sources, but we particularly wish to acknowledge BC Hydro and Power, FortisBC, Statistics Canada, Chelan County PUD, the Eugene Water and Electric Board, Energy Northwest, Idaho Power Company, Pend Oreille PUD, Portland General Electric, PPL Montana, Puget Sound Energy, Seattle City Light, PacifiCorp, Tacoma City Light, Washington Public Power Supply, The Northwest Power Pool, Portland General Electric, the Natural Resources Conservation Service, US Bureau of Reclamation, the US Geological Survey, the US Department of Agriculture and the US Army Corp of Engineers. We are of course grateful for the hard working and exceptional team that worked over two years to compile and recalculate this enormous and complicated dataset, while improving the quality of the dataset and greatly enhancing the project documentation: Maler Annamalai, US Army Corp of Engineers, Northwestern Division James Burton, US Army Corp of Engineers, Portland District Phillip Butcher, Bonneville Power Administration Arthur Evans, VOLT Workforce Solutions Gary Flightner, Gary Flightner Engineering Linda Jackson, Bonneville Power Administration Cara McCarthy, Bonneville Power Administration (current affiliation: Natural Resources

Conservation Service, Portland Office) Arun Mylvanahan, Bonneville Power Administration Paper copies of this documentation may be obtained form the Bonneville Power Administration Library: Bonneville Power Administration, Library-1 P.O. Box 3621 Portland, OR 97208-3621 library@bpa.gov Erik Pytlak Bonneville Power Administration 31 August 2011

Table of Contents

Section 1 Introduction ...................................................................................................1 1.1 Study History.........................................................................................................1 1.2 The Region ............................................................................................................2 1.3 Data Types.............................................................................................................3 1.4 Naming Conventions.............................................................................................3

Section 2 Process...........................................................................................................5 2.1 H............................................................................................................................5 2.2 S.............................................................................................................................5

2.2.1 Average Daily Storage Change Calculation ..................................................6 2.2.2 Initial Fill .......................................................................................................6 2.2.3 Grand Coulee Dam – Banks Lake (P and G).................................................6

2.3 A............................................................................................................................6 2.4 L and ARF.............................................................................................................7

2.4.1 Routing...........................................................................................................8 2.4.1.1 SSARR Routing Characteristics.................................................................8 2.4.1.2 Routing Details...........................................................................................9

2.4.2 Negative Local Flows ..................................................................................10 2.4.3 Indexing Local Flows ..................................................................................11

2.5 D and DD ............................................................................................................12 2.6 E and EE..............................................................................................................13 2.7 M .........................................................................................................................14

Section 3 Discussion by Region..................................................................................15 3.1 Upper Columbia and Kootenay Basins ...............................................................16

3.1.1 Regional Map...............................................................................................17 3.1.2 List of Points ................................................................................................18 3.1.3 Special Characteristics .................................................................................18 3.1.4 Equations......................................................................................................22

3.2 Pend Oreille & Spokane Basins ..........................................................................24 3.2.1 Regional Map...............................................................................................26 3.2.2 List of Points ................................................................................................27 3.2.3 Special Characteristics .................................................................................27 3.2.4 Equations......................................................................................................30

3.3 Mid-Columbia Basin ...........................................................................................32 3.3.1 Regional Map...............................................................................................34 3.3.2 List of Points ................................................................................................35 3.3.3 Special Characteristics .................................................................................35 3.3.4 Mid-Columbia Locals Methodology............................................................37

3.3.4.1 Introduction ..............................................................................................37 3.3.4.2 Comparison of Old vs. New Method from 2000 through 2008 ...............37 3.3.4.3 2000 Level/ Old Method ..........................................................................42 3.3.4.4 Alternate/ New Method............................................................................43

3.3.5 Equations......................................................................................................46 3.4 Upper and Central Snake Basins.........................................................................48

3.4.1 Regional Map 1............................................................................................50

3.4.2 Regional Map 2............................................................................................51 3.5 Lower Snake Basin..............................................................................................52

3.5.1 Regional Map...............................................................................................53 3.5.2 List of Points ................................................................................................54 3.5.3 Special Characteristics .................................................................................54 3.5.4 Equations......................................................................................................57

3.6 Lower Columbia Basin........................................................................................59 3.6.1 Regional Map...............................................................................................61 3.6.2 List of Points ................................................................................................62 3.6.3 Special Characteristics .................................................................................62 3.6.4 Equations......................................................................................................67

3.7 Willamette Basin .................................................................................................68 3.7.1 Regional Map...............................................................................................69 3.7.2 List of Points ................................................................................................70 3.7.3 Special Characteristics .................................................................................70 3.7.4 Equations......................................................................................................73

3.8 Western Washington Basin .................................................................................75 3.8.1 Regional Map...............................................................................................76 3.8.2 List of Points ................................................................................................77 3.8.3 Equations......................................................................................................77

3.9 Western Oregon Basin ........................................................................................78 3.9.1 Regional Map...............................................................................................79 3.9.2 List of Points ................................................................................................80 3.9.3 Special Characteristics .................................................................................80 3.9.4 Equations......................................................................................................80

Section 4 Columbia Basin Project Return Flows Study..............................................81 4.1 Introduction .........................................................................................................81 4.2 Purpose of Study .................................................................................................81 4.3 Columbia Basin Project Overview......................................................................82 4.4 Return Flow – General ........................................................................................85

4.4.1 Return flow from lands irrigated by Banks Lake.........................................85 4.4.2 Return flow from other sources ...................................................................87

4.5 Return Flow – Details .........................................................................................88 4.5.1 Return flows to Wanapum Reservoir (WRF5D) .........................................89 4.5.2 Return flows to Priest Rapids Reservoir (PRF5D) ......................................91 4.5.3 Return flows to McNary Reservoir (MRF5D).............................................93

Section 5 Results .........................................................................................................99 5.1 Changes in Depletion: 2000 Level vs 2010 Level ..............................................99 5.2 Comparison of 2000 vs. 2010 Modified Flows.................................................101

5.2.1 Upper Columbia and Kootenay .................................................................101 5.2.2 Pend Oreille and Spokane..........................................................................102 5.2.3 Mid-Columbia............................................................................................104 5.2.4 Lower Snake ..............................................................................................105 5.2.5 Lower Columbia ........................................................................................106 5.2.6 Willamette..................................................................................................108 5.2.7 USBR Special Studies................................................................................109

References ................................................................................................................111

Appendix A – List of Points ......................................................................................... A-1

Appendix B – River Schematics ....................................................................................B-1

Appendix C – Calculating Depletions (D): Details .......................................................C-1 C.1 Define Subareas.................................................................................................C-2

C.1.1 United States Subareas...............................................................................C-2 C.1.2 Digitizing of Subarea Map.........................................................................C-3

C.1.2.1 County Irrigated Acreage Percentages...................................................C-4 C.1.2.2 Subarea Partitioning ...............................................................................C-6

C.1.3 Canadian Subareas .....................................................................................C-7 C.2 Irrigated Acres in a Subarea ..............................................................................C-9

C.2.1 United States Irrigated Acres .....................................................................C-9 C.2.2 Canadian Irrigated Acres .........................................................................C-12

C.3 Crop Water Requirement ................................................................................C-12 C.3.1 Monthly Requirement Per Crop...............................................................C-14 C.3.2 Annual Requirement per Subarea ............................................................C-16

C.4 Irrigation Methods and Efficiency ..................................................................C-17 C.5 Determine Diversion per Unit Area ................................................................C-20 C.6 Determine Return Flow per Unit Area............................................................C-22 C.7 Determine Depletions per unit area.................................................................C-23 C.8 Determine Incremental Irrigation Acreage .....................................................C-24 C.9 Determine Incremental Depletions in cfs........................................................C-26 C.10 Applying D to Modified Flow Points..............................................................C-27

Appendix D – Depletion Data....................................................................................... D-1 D.1 Application of Irrigation Adjustment............................................................... D-2

D.1.1 Upper Columbia and Kootenay Basins..................................................... D-2 D.1.2 Pend Oreille and Spokane Basins ............................................................. D-3 D.1.3 Mid-Columbia Basin................................................................................. D-4 D.1.4 Lower Snake Basin ................................................................................... D-5 D.1.5 Lower Columbia Basin ............................................................................. D-6 D.1.6 Willamette Basin....................................................................................... D-7

D.2 Irrigated Crop Acreage by County ................................................................... D-8 D.2.1 Upper Columbia and Kootenay Basins..................................................... D-8 D.2.2 Pend Oreille and Spokane Basins ............................................................. D-9 D.2.3 Mid-Columbia Basin............................................................................... D-12 D.2.4 Lower Snake Basin ................................................................................. D-14 D.2.5 Lower Columbia Basin ........................................................................... D-16 D.2.6 Willamette Basin..................................................................................... D-19

D.3 Percent of County Irrigated Acreage within Subarea and Percent Distribution of Crop Types ....................................................................................... D-20

D.3.1 Upper Columbia and Kootenay Basins................................................... D-20 D.3.2 Pend Oreille and Spokane Basins ........................................................... D-21 D.3.3 Mid-Columbia Basin............................................................................... D-25 D.3.4 Lower Snake Basin ................................................................................. D-27 D.3.5 Lower Columbia Basin ........................................................................... D-30

D.3.6 Willamette Basin..................................................................................... D-34 D.4 Monthly Diversion Distribution Percentage and Total Water Required by Crops per 1000 Acres................................................................................................ D-35

D.4.1 Upper Columbia and Kootenay Basins................................................... D-35 D.4.2 Pend Oreille and Spokane Basins ........................................................... D-38 D.4.3 Mid-Columbia Basin............................................................................... D-41 D.4.4 Lower Snake Basin ................................................................................. D-43 D.4.5 Lower Columbia Basin ........................................................................... D-45 D.4.6 Willamette Basin..................................................................................... D-48

D.5 Diversion and Return Flow Volumes (ac-ft/1000 ac) based on Sprinkler/Gravity Efficiencies .................................................................................. D-49

D.5.1 Upper Columbia and Kootenay Basins................................................... D-49 D.5.2 Pend Oreille and Spokane Basins ........................................................... D-51 D.5.3 Mid-Columbia Basin............................................................................... D-53 D.5.4 Lower Snake Basin ................................................................................. D-54 D.5.5 Lower Columbia Basin ........................................................................... D-55 D.5.6 Willamette Basin..................................................................................... D-57

D.6 Depletions per Unit Area................................................................................ D-58 D.6.1 Upper Columbia and Kootenay Basins................................................... D-58 D.6.2 Pend Oreille and Spokane Basins ........................................................... D-61 D.6.3 Mid-Columbia Basin............................................................................... D-64 D.6.4 Lower Snake Basin ................................................................................. D-66 D.6.5 Lower Columbia Basin ........................................................................... D-68 D.6.6 Willamette Basin..................................................................................... D-73

D.7 Surface Water Irrigated Acreage.................................................................... D-74 D.7.1 Upper Columbia and Kootenay Basins................................................... D-74 D.7.2 Pend Oreille and Spokane Basins ........................................................... D-76 D.7.3 Mid-Columbia Basin............................................................................... D-78 D.7.4 Lower Snake Basin ................................................................................. D-80 D.7.5 Lower Columbia Basin ........................................................................... D-82 D.7.6 Willamette Basin..................................................................................... D-85

D.8 Incremental Surface Water Irrigated Acreage................................................ D-86 D.8.1 Upper Columbia and Kootenay Basins................................................... D-86 D.8.2 Pend Oreille and Spokane Basins ........................................................... D-89 D.8.3 Mid-Columbia Basin............................................................................... D-92 D.8.4 Lower Snake Basin ................................................................................. D-94 D.8.5 Lower Columbia Basin ........................................................................... D-96 D.8.6 Willamette Basin..................................................................................... D-99

Appendix E – Routing Diagram ....................................................................................E-1

Appendix F – Routing Characteristics ..........................................................................F-1

Appendix G – Storage/Elevation Tables....................................................................... G-1 G.1 Pend Oreille and Spokane ................................................................................ G-1 G.2 Mid-Columbia .................................................................................................. G-9 G.3 Lower Snake................................................................................................... G-15 G.4 Lower Columbia............................................................................................. G-20

G.5 Willamette ...................................................................................................... G-23 G.6 Western Washington ...................................................................................... G-32 G.7 Western Oregon.............................................................................................. G-36

Supplemental Report – U.S Bureau of Reclamation Special Studies..............................S-1 List of Figures Figure 3-1. Upper Columbia and Kootenay Basin Map ....................................................17 Figure 3-2. Pend Oreille and Spokane Basin Map.............................................................26 Figure 3-3. Mid-Columbia Basin Map...............................................................................34 Figure 3-4. Wells Dam Old Locals vs. New Locals ..........................................................38 Figure 3-5. Rocky Reach Dam Old Locals vs. New Locals ..............................................39 Figure 3-6. Rock Island Dam Old Locals vs. New Locals ................................................40 Figure 3-7. Priest Rapids Dam Old Local vs. New Locals................................................41 Figure 3-8. Priest Rapids New Locals ...............................................................................42 Figure 3-9. Upper Snake Basin Map..................................................................................50 Figure 3-10. Central Snake Basin Map..............................................................................51 Figure 3-11. Lower Snake Basin Map ...............................................................................53 Figure 3-12. Lower Columbia Basin Map .........................................................................61 Figure 3-13. Schematic of Pumping and Return Flows at McNary Dam and John

Day Dam ..........................................................................................................63 Figure 3-14. Map of Kennewick Return Flows .................................................................65 Figure 3-15. Willamette Basin Map...................................................................................69 Figure 3-16. Western Washington Basin Map...................................................................76 Figure 3-17. Western Oregon Basin Map..........................................................................79 Figure 4-1. Columbia Basin Project (USBR 1984) ...........................................................83 Figure 4-2. Discharge Locations of Wasteways with Return Flow to Wanapum

Reservoir ..........................................................................................................90 Figure 4-3. Discharge Locations of Wasteways with Return Flow to Priest Rapids

Reservoir ..........................................................................................................92 Figure 4-4. Discharge Locations of Wasteways with Return Flow to McNary

Reservoir ..........................................................................................................94 Figure 5-1. Upper Columbia Basin at Murphy Creek Dam – Average Daily 4M

vs. 5M ............................................................................................................101 Figure 5-2. Pend Oreille Basin at Seven Mile Dam – Average Daily 4M vs. 5M ..........102 Figure 5-3. Spokane Basin at Little Falls Dam– Average Daily 4M vs. 5M...................103 Figure 5-4. Mid-Columbia Basin at Priest Rapids Dam – Average Daily 4M vs.

5M..................................................................................................................104 Figure 5-5. Lower Snake Basin at Ice Harbor Dam – Average Daily 4M vs. 5M ..........105 Figure 5-6. Lower Columbia Basin at The Dalles Dam – Average Daily 4M vs.

5M..................................................................................................................107 Figure 5-7. Lower Columbia Basin at Bonneville Dam – Average Daily 4M vs.

5M..................................................................................................................108 Figure 5-8. Willamette Basin at T.W. Sullivan Dam – Average Daily 4M vs. 5M.........109 Figure C-1. Map of United States Subareas.....................................................................C-3 Figure C-2. Map of Irrigated Acres within the United States..........................................C-5

Figure C-3. Map of Canadian Subbasins .........................................................................C-8 Figure C-4. Percentage Application of Incremental Depletions (LCF5D) in the

Lower Clark Fork Subarea...........................................................................C-28 List of Tables Table 1-1. Study History......................................................................................................2 Table 1-2. Data Types..........................................................................................................3 Table 3-1. Upper Columbia and Kootenay Basin Points...................................................18 Table 3-2. Regression Coefficients....................................................................................21 Table 3-3. Pend Oreille and Spokane Basin Points ...........................................................27 Table 3-4. Regression Coefficients....................................................................................28 Table 3-5. Mid-Columbia Basin Points .............................................................................35 Table 3-6. Rocky Reach Regression Coefficients .............................................................44 Table 3-7. Rock Island Regression Coefficients................................................................44 Table 3-8. Lower Snake Basin Points................................................................................54 Table 3-9. Lower Columbia Basin Points.........................................................................62 Table 3-10. Willamette Basin Points .................................................................................70 Table 3-11. Western Washington Basin Points .................................................................77 Table 3-12. Western Oregon Basin Points.........................................................................80 Table 4-1. Groundwater Return Flow and Variables.........................................................89 Table 4-2. Groundwater Return Flow Distribution............................................................89 Table 4-3. Wasteway Return Flows to Wanapum Reservoir.............................................90 Table 4-4. Total Return Flows to Wanapum Reservoir.....................................................91 Table 4-5. Wasteway Return Flows to Priest Rapids Reservoir........................................92 Table 4-6. Total Return Flows to Priest Rapids Reservoir ................................................93 Table 4-7. Wasteway Return Flows to McNary Reservoir................................................94 Table 4-8. Returns From Pumping West of Pasco, Washington .......................................95 Table 4-9. Diversions to Blocks 2 and 3 (ac-ft).................................................................96 Table 4-10. Blocks 2 and 3 Return Flow Rates .................................................................96 Table 4-11. Blocks 2 and 3 Return Flow ...........................................................................97 Table 4-12. Block 1 Return Flow Rate ..............................................................................97 Table 4-13. Block 1 Return Flow ......................................................................................98 Table 4-14. Total Return Flows to McNary Reservoir ......................................................98 Table 5-1. Comparison of 2000 and 2010 Irrigated Acreages and Depletions by

Basin ..............................................................................................................100 Table 5-2. Upper Columbia Basin at Murphy Creek Dam - Average Monthly 4M

vs. 5M ............................................................................................................102 Table 5-3. Pend Oreille Basin at Seven Mile Dam- Average Monthly 4M vs. 5M.........103 Table 5-4. Spokane Basin at Little Falls Dam - Average Monthly 4M vs. 5M...............104 Table 5-5. Mid-Columbia Basin at Priest Rapids Dam- Average Monthly 4M vs.

5M..................................................................................................................105 Table 5-6. Lower Snake Basin at Ice Harbor Dam - Average Monthly 4M vs. 5M........106 Table 5-7. Lower Columbia Basin at The Dalles Dam - Average Monthly 4M vs.

5M..................................................................................................................107

Table 5-8. Lower Columbia Basin at Bonneville Dam - Average Monthly 4M vs. 5M..................................................................................................................108

Table 5-9. Willamette Basin at T.W. Sullivan Dam - Average monthly 4M vs. 5M ......109 Table 5-10. USBR Special Study Points..........................................................................110 Table C-1. List of United States Subareas .......................................................................C-4 Table C-2. List of Canadian Subareas .............................................................................C-8 Table C-3. Irrigated Crop Acreage by County within Lower Clark Fork Subarea........C-10 Table C-4. Percent of County Irrigated Acreage within Lower Clark Fork Subarea ....C-11 Table C-5. Percent Distribution of Crop Types within Lower Clark Fork Subarea ......C-11 Table C-6. Climatological Stations used in IWR...........................................................C-14 Table C-7. Example Output from IWR of Water Required by Alfalfa Hay in

Lower Clark Fork Subarea...........................................................................C-15 Table C-8. Yearly Water Requirement (inches) of the Various Crops within

Lower Clark Fork Subarea...........................................................................C-16 Table C-9. Annual Irrigation Requirement (ac-ft per 1000 ac) within Lower Clark

Fork Subarea ................................................................................................C-17 Table C-10. Diversion Sprinkler and Gravity Efficiency (%) .......................................C-18 Table C-11. Return Flow Sprinkler and Gravity Efficiency (%)...................................C-19 Table C-12. Diversion and Return Flow Volumes (ac-ft per 1000 ac) within

Lower Clark Fork Subarea based on Sprinkler/Gravity Efficiencies ..........C-20 Table C-13. Monthly Percent Distribution of Irrigation Diversion within Lower

Clark Fork Subarea ......................................................................................C-21 Table C-14. Monthly Diversion Volume (Sprinkler/Gravity) per unit area within

Lower Clark Fork Subarea...........................................................................C-22 Table C-15. Monthly Return Flow Volume (Sprinkler/Gravity) per Unit Area

within Lower Clark Fork Subarea................................................................C-23 Table C-16. Depletions per Unit Area (cfs/1000 ac): Sprinkler/Gravity.......................C-24 Table C-17. Surface Water Irrigated Acreage (Sprinkler/Gravity) within Lower

Clark Fork Subarea ......................................................................................C-25 Table C-18. Incremental Surface Water Irrigated Acreage (Sprinkler/Gravity)

within Lower Clark Fork Subarea................................................................C-26 Table F-1. Coefficients for Computing Routed flows (ARF) ..........................................F-3 Table F-2. Coefficients for Computing Local Flows (L).................................................F-4 Table F-3. Libby routed to Leonia, WY1999-2008.........................................................F-5 Table F-4. Richmond + Pasco routed to McNary, WY1928-1949..................................F-5 Table F-5. Richmond + Pasco routed to McNary, WY1950-1953..................................F-5 Table F-6. McNary routed to John Day, WY1950-1968 .................................................F-6 Table F-7. The Dalles routed to Bonneville, 7/1928 - Present ........................................F-6 Table F-8. Vida+Eugene routed to Harrisburg, 7/1928 - Present ....................................F-6 Table F-9. Harrisburg+Monroe routed to Corvalis, 7/1928 - Present .............................F-7 Table F-10. Corvalis routed to Albany, 7/1928 - Present ................................................F-7 Table F-11. Albany+Jefferson routed to Salem, 7/1928 - Present...................................F-8 Table F-12. Salem routed to T.S Sullivan, 7/1928 - Present ...........................................F-8

Section 1 Introduction The Bonneville Power Administration (BPA), the United States Army Corps of Engineers (USACE), and the U.S. Bureau of Reclamation (USBR) perform hydroregulation studies of the Columbia River basin for analysis of environmental impacts, changes to operation criteria from Biological Opinions, power revenue forecasts, flood control studies, operations planning, downstream benefit calculations, and effects of new projects or plant data. Also, a wide range of other regional organizations, including the Northwest Power and Conservation Council, Northwest Power Pool, Pacific Northwest Utilities Conference Committee, fishery agencies and organizations, universities, research organizations, contractors, and public interest groups have a need for a consistent and accepted regional streamflow dataset. Modified flows are defined as the historical streamflows that would have been observed if current irrigation depletions (as of year 2008) existed in the past and if the effects of river regulation were removed (except at the upper Snake, Deschutes, and Yakima basins where current upstream reservoir regulation practices are included). However, irrigation practices have changed since the historical flows were observed and so the historical streamflows have been adjusted to account for current levels of irrigation depletions. The 2010 modified flow study includes 80 years of flows (1928-2008) adjusted to 2010 irrigation depletions.

1.1 Study History This report is the fifth in a series that has been compiled every ten years (Table 1-1.), beginning in 1970, as required by the Pacific Northwest Coordination Agreement (PNCA) and Columbia River Treaty. An Interagency Depletions Task Force of the Columbia River Water Management Group compiled the 1970 and 1980 Modified Flow Reports. The first report, the 1970 Modified Streamflows Report, contained the monthly streamflow data for various sites in the Columbia River Basin and coastal tributaries in the Northwest for the 40-year period 1928 to 1968 adjusted to the 1970 level of irrigation development. The second report, the 1980 Modified Streamflows Report, contained the monthly streamflow data for various sites in the Columbia River Basin and coastal tributaries in the Northwest for the 50-year period 1928 to 1978 adjusted to the 1980 level of irrigation development. The third report, the 1990 Modified Streamflows Report, was contracted by BPA to A.G. Crook Co. and contained two periods per month of streamflow data for various sites in the Columbia River Basin and coastal tributaries in the Northwest for the 61 year period 1928 to 1989 adjusted to the 1990 level of irrigation development. The fourth study and report was prepared for BPA by independent contractors in coordination with other federal and state agencies, Canadian authorities, and Northwest electric utilities. It contains daily streamflow data for various sites in the Columbia River Basin and semi-monthly data forcoastal tributaries in the Northwest for the 71 year period 1928 to 1999 for the 2000 level of irrigation development. This fifth study includes 80 years of flows for the period 1928-2008 adjusted to the 2010 level of irrigation development. It contains daily streamflow data for the Columbia and Willamette Basins and semi-monthly data (split as day 1-15 and day 16-last day) for the Puget Sound and Coastal Basins.

Page 1

Table 1-1. Study History

Study 1 1928 – 1968 40 Years--1970 Level of Development Monthly Flows Study 2 1928 – 1978 50 Years – 1980 Level of Development Monthly Flows Study 3 1928 – 1989 61 Years – 1990 Level of Development 2 Periods/Month Study 4 1928 – 1999 71 Years – 2000 level of Development Daily Flows

Study 5 1928 - 2008 80 years – 2010 Level of Development Daily Flows

1.2 The Region The region of study includes the Canadian portion of the Columbia River basin, and the U.S. portion of the Columbia River basin in Washington, Oregon, Idaho, western Montana, and parts of Wyoming, Utah and Nevada. This study also includes the coastal and Puget Sound drainages in Washington; and the coastal and Closed Basins (excluding Goose Lake) in Oregon. The climate across the region is quite variable. Annual precipitation ranges from less than 10 inches in the Columbia and Snake River Plateaus to well over 100 inches in the Coast Mountains and Cascade Ranges. Winter minimum daily temperatures along the Pacific Coast are usually in the range of 35 to 45°F, and summer maximums are between 65 and 75°F. Inland, the seasonal temperature fluctuations are more extreme. In the Columbia and Snake River Plateaus, winter temperatures below 0°F and summer temperatures above 100°F are not uncommon. The region is centered in the zone of prevailing westerly atmospheric flow. In the winter, the westerly flow often contains mature occluded fronts that are associated with extensive zones of precipitation. Uplift of the air masses caused by the Coast, Cascade, and Rocky Mountain Ranges results in atmospheric cooling and heavy precipitation on the windward side of these mountain ranges. This pattern is most pronounced in winter. Summer is characteristically storm-free, except for isolated thunderstorms. The region’s runoff falls into two categories: (1) the snowmelt-dominated regime of the interior drainages east of the Cascade Range; and (2) the rainfall-dominated regime of the coastal drainages west of the Cascade Range. East of the Cascades, most of the runoff volume occurs during the snowmelt period, May through July. Streamflows gradually rise over a period of a month or more reaching a peak discharge during early June. Streamflow fluctuations are caused by variations in solar radiation, air temperature, humidity, and wind. Rain on the snowpack can add significantly to the runoff. Streamflow recessions following the peak runoff are prolonged by snowmelt and ground water outflow. Streams west of the Cascades are dominated by rainfall during the winter months. Tributary streams respond to precipitation within a few hours. Peak discharges near the mouth of the Willamette Basin, which drains more than 11,000 square miles, occur within four days of the corresponding rainfall. The majority of the runoff from these

Page 2

areas occurs in the winter period, October through March, but moderate streamflows continue through the spring and early summer months fed by late snowmelt from high areas and ground water outflows. Streamflow recession continues into the fall until the return of the wet season in October.

1.3 Data Types The data types used in the process of calculating modified flows are listed in Table 1-2. The data types are discussed in detail in Section 2 and data sources are listed in Section 3. Table 1-2. Data Types

ID Data TypesH Average daily observed streamflow or project outflow, cfsS Average daily observed storage change at projects, cfs

(This includes storage change during initial fill of the projects)A Average daily inflow into projects - either provided by the project owners

or calculated as: Inflow (A) = Outflow (H) + Storage Change (S), cfs L Average daily local flow (incremental flow between adjacent stations or projects), cfsP Average daily diversion to Banks Lake from Franklin Delano Roosevelt Lake (FDR)

(via pumping), cfsG Average daily diversion from Banks Lake to Franklin Delano Roosevelt Lake (FDR)

(for generation), cfsARF Average daily unregulated flow based on Streamflow Synthesis and Reservoir

Regulation (SSARR) routing, cfsE At site evaporation, cfsD At site irrigation depletion, cfs

EE Accumulated evaporation for all upstream points, cfsDD Accumulated depletions for all upstream points, cfsM Average daily modified flow, cfsR Monthly regulated flow provided by the Bureau of Reclamation, cfs

(referred to as "Modified flows" in Bureau's technical report in Section 4) A full list of all the modified flow points and the various types of data for each point can be found throughout Section 3, as well as in Appendix A.

1.4 Naming Conventions Each project and site has been given a three-character identifier. The fourth character in the identifier is the study number. The 50-year study was number “2”. The 61-year study was number “3”. The 71-year study is “4”. This study, the 80-year study, is “5”. The fifth, sixth and seventh characters of each project identifier define the type of data. The data types are defined in Section 1.3. In some instances references are made to the data type in general rather than indicating any particular study. In these cases a “_” was used as the fourth character rather than the study number. A few examples of project identifiers are:

Page 3

Page 4

LIB1H Libby Dam Inflow, Study No. 1 (1928-1968) LIB2H Libby Dam Inflow, Study No. 2 (1928-1978) LIB3H Libby Dam Inflow, Study No. 3 (1928-1989) LIB4H Libby Dam Inflow, Study No. 4 (1928-1999) LIB5H Libby Dam Inflow, Study No. 5 (1928-2008) LIB_H Libby Dam Inflow HGH5S Hungry Horse Reservoir Change of Storage Content, Study No. 5 CFM5ARF Columbia Falls Routed Flows, Study No. 5 MCD5E Incremental Reservoir Evaporation at Mica Dam, Study No. 5 UPC5D Irrigation Depletions Upper Columbia Basin above Mica Dam, Study 5 GCL5DD Accumulated Irrigation Depletions above Grand Coulee Dam, Study No. 5 TDA5M Average Daily Modified Flows at The Dalles Dam, Study No. 5

Section 2 Process As shown in Section 1.3, there are many kinds of flows defined and used in this study to calculate modified flows. These various flows will be discussed and described in more detail in the rest of Section 2. At some modified flow locations, the various flows may be calculated differently than discussed in Section 2, or may have some special characteristics. These locations are discussed in detail by region within Section 3 .

2.1 H Data type H is defined as average daily observed streamflow or project outflow. Stream gaging stations recording daily flow data may or may not be located at a project site, and may or may not cover all of the 80-year study period. When the record was missing for all or a part of the 80-year period, the record for the stream-gaging site was estimated using linear regression from a nearby station or stations. When the gaging site was not at the project location, it was necessary to move the record either upstream or downstream to the project site. To accomplish this, gaging records were generally obtained both upstream and downstream from the project, and the project flow was determined as the upstream flow, plus a portion of the incremental flow of the ungaged portion based on a drainage area ratio. While this was the general case, gaging records were also moved to project site locations by correlations with nearby stations or other adjustments as required on a site-by-site determination. Schematic diagrams for each site (shown in Section 3) illustrate computational procedures for historical streamflow. When the gaging station location and the project site were extremely close with no incremental inflow from side streams, the project flow was taken as the gaged flow with no adjustment. The streamflow data obtained from the various sources often had obvious errors or missing data. To correct these problems the data was put into HEC DSSVue (USACE, 2009) and plotted. The errors and small amounts of missing data were corrected by linear interpolation between the good data points. When a large amount of data was missing it was filled from other sources. For example if U.S. Geological Survey (USGS) was used as the primary source of data for a particular location, missing data would be filled using data from the USACE database available for that same location.

2.2 S Data type S is the average daily observed storage change at project sites, and includes the storage change during the initial fill of the projects. S values can therefore be positive or negative. Dams were constructed to store water for various purposes such as irrigation, hydroelectric power production, flood control, recreation, and other purposes. Water is stored during periods of abundant flow so that it is available to either safely release a flood flow at a later time, or to augment flows during low flow periods. A few reservoirs were in existence prior to the beginning of the study period of July 1, 1928 but most were constructed afterward.

Page 5

Storage change in lakes and reservoirs, or reservoir elevations, were obtained from sources such as the USGS, the USACE, Environmental Canada, and project owners. The data was reviewed for errors and missing data. Corrections were made using the same method described in Section 2.1.

2.2.1 Average Daily Storage Change Calculation Lake elevations were converted to storage content using the most recent available storage/elevation tables. All elevation readings were instantaneous ones collected at midnight Local Time The storage/elevation tables were obtained from the project owners, and can be found in Appendix G. Daily change in storage, in cfs, was calculated using:

S = (Sn - Sn-1) (43,560 ft2 / ac) (1 day / 86,400 s) where, S – daily change in storage, cfs Sn – Storage at midnight, ac ft Sn-1 – Storage at midnight of previous day, ac ft

2.2.2 Initial Fill Storage change adjustments were made at project sites to account for the initial or first-time filling, of the reservoir. This initial fill storage adjustment was previously identified as an “F” type data, but is now included as part of the S data.

2.2.3 Grand Coulee Dam – Banks Lake (P and G) The reservoir created by the Grand Coulee dam project is called the Franklin D. Roosevelt Lake (FDR). The irrigation holding reservoir at Grand Coulee dam is called Banks Lake. The diversion to Banks Lake by pumping from Franklin D. Roosevelt Lake is included herein as a storage change rather than an irrigation diversion, and is identified as a “P”. Diversions from Banks Lake to Franklin D. Roosevelt Lake for generation are identified by a “G”. The pumping plant at Grand Coulee diverts water from Franklin D. Roosevelt Lake to Banks Lake which provides temporary storage of irrigation flows for the USBR Columbia Basin Project which has approximately 671,000 acres of irrigated cropland. Flow is also returned from Banks Lake to Franklin D. Roosevelt Lake for power generation. These diversions to and returns from Banks Lake are treated as change-of-content in the computation of A and ARF flows.

2.3 A Daily project inflow A was either calculated from project outflow and project storage change or was provided directly by the project owner. The project inflow was calculated with the following formula (all values are in cfs):

A = H + S

Page 6

Due to erroneous project data, calculated project inflows were sometimes negative. Most of the time negative inflows are incorrect, so S, the change in storage, was assumed to be the source of error contributing towards the negative values. This is because S is often determined from reservoir elevation measurements (using storage/elevation tables) and any small discrepancies in these elevation measurements can result in large errors in the corresponding storage, and hence change in storage values. To correct the negative inflows, storage change values were increased to create a reasonable positive inflow. When a storage change value was increased, storage change values were decreased on a different day or days in the same month. This was done to preserve the overall monthly storage change volumes. For example, at Fall Creek (FAL), using the equation above, the inflow on May 5, 2001 was found to be -191 cfs. To correct the negative inflow, 600 cfs was added to the change in storage on that day. This produced a new inflow of 409 cfs. To maintain the overall monthly volume, 600 cfs was subtracted from the change in storage value on May 6, 2001.

2.4 L and ARF Local flows L are the flows that enter the river system between two projects or between a project and a gaging station. Routing is required to compute these local flows. To accomplish this, the outflow at the upstream project is routed by the USACE’s Streamflow Synthesis and Reservoir Regulation (SSARR) model to the downstream project, and subtracted from either the inflow at the downstream point if the downstream point is a dam or from the gaged flow if the downstream point is a gage. In other words: Between two dams:

Local flow = Downstream point Inflow (5A) – Upstream point Outflow (5H) routed down OR Between an upstream dam and downstream gaging station:

Local flow = Downstream point gaged flow (5H) – Upstream point Outflow (5H) routed down These calculated local flows are plotted to determine if they have a logical hydrological shape. If these calculated values look reasonable, they are accepted as final local flow values and are used towards the calculation of routed flows (ARF). However, most of the time, the calculated local flows had erratic spikes in the data or negative values. In some cases the calculated values are negative for entire months. Explanations for why local flows are sometimes negative and how these negative or unreasonable local flow values are handled is discussed in Sections 2.4.2 and 2.4.3.

Page 7

Routed flows, denoted as ARF, represent what flows at a given location would be if the upstream dams did not exist. At headwater locations, or locations where there are no upstream dams there are no ARF values, only A values. At all other locations (where dams are present upstream), ARF is calculated as local flows (L) added to upstream A or ARF values that have been routed down. For example, the ARF at Revelstoke Dam (RVC) is calculated as shown below. RVC is the modified flow point immediately downstream of the headwater project, Mica (MCD).

RVC5ARF = (MCD5A routed to RVC) + RVC5L The ARF at Arrow Dam (ARD), the next point downstream of Revelstoke, is calculated as:

ARD5ARF = (RVC5ARF routed to ARD) + ARD5L A full list of equations used to calculate ARF values can be found throughout Section 3 as well as in Appendix E. ARF flows are basic to the development of modified flows because they will be modified for irrigation diversion and evaporation to the 2010 level of development.

2.4.1 Routing Beginning with the fourth modified flow study, daily flow data was calculated in addition to the monthly and semi-monthly data provided in prior studies. Previously when flows were provided as monthly/semi-monthly data, the time taken for water to flow from an upstream to downstream point was not accounted for because the travel time was insignificant compared to the monthly/semi-monthly time-step of the data. However, on a daily time-step it is necessary to route the streamflow and reservoir change-of-content downstream to account for the time it takes for water to travel from one point to another. In the fourth study, the USACE SSARR model was used to route daily flows downstream. For this study the Corps HEC-ResSim model (USACE, 2007) was used. In both the SSARR and HEC-ResSim models SSARR routing characteristics (USACE, 1991) were used. The routing characteristics used in this study can be found in Appendix F. Although only nine years of new data were added in this study, data back from the 1960’s were also re-routed in the Upper Columbia, Mid-Columbia and Lower Columbia basins because of updated datasets and new methodology. Flow in the Willamette basin were routed for the first time in this study from 1928 – 2008; prior to this study, routing was not done in the Willamette. This is discussed further in Sections 3.1.3, 3.3.4 and 3.7.3 respectively.

2.4.1.1 SSARR Routing Characteristics The SSARR routing method is a “cascade of reservoirs” technique, wherein the lag and attenuation of the flood wave is simulated through successive increments of lake type

Page 8

storage. A channel can be visualized as a series of small “lakes” which represent the natural delay of runoff from upstream to downstream points. The user specifies the routing characteristics of the prototype “lake” as well as the number of “lake” increments. The user specified routing characteristics are the same as those used in the 2000 Level study (BPA, 2000).

2.4.1.2 Routing Details Within HEC-ResSim the Columbia River Basin is divided into eight sub-basins:

the Upper Columbia Basin, the Middle Columbia basin, the Lower Columbia Basin, the Snake River Basin from Brownlee to Ice Harbor, the Kootenai River Basin, the Pend Oreille River Basin, the Spokane River Basin and, the Willamette River Basin.

The Willamette River Basin flows were not routed in the 2000 Level study, so for this 2010 Level study, routing coefficients developed by the US Army Corps of Engineers were used. For all other basins, most of the routing coefficients used were the same as used in the previous study. Tables with updated SSARR routing coefficients for all basins can be found in Appendix F. Two SSARR routings are performed in the development of ARF. The initial SSARR routing objective is to compute the local or incremental flow between two adjacent stations. To accomplish this, the outflow at the upstream project is routed by SSARR to the downstream project and subtracted from the inflow at the downstream project. As an example refer to Appendix E. For example, the local flows at Columbia Falls (CFM) gaging station were determined as:

CFM5L = CFM5H - HGH5H routed to CFM Note that because CFM is a gaging station, and not a dam, the local is calculated by subtracting the Hungry Horse Dam (HGH) routed outflow from a 5H value (streamflow gaging station), rather than a more typical 5A value (calculated project inflow), as shown with KER below. And at the next point downstream, Kerr Dam (KER):

KER5L = KER5A - CFM5H routed to KER

These procedures are continued downstream to determine the local flows throughout the basin.

Page 9

The second SSARR routing objective is to compute the routed flow (ARF) at each of the project locations that are downstream of a storage project. HGH, for example, is a headwater dam with no other dams above it. The inflow to HGH is the sum of the project outflow and the change of reservoir content:

HGH5A = HGH5H + HGH5S For headwater projects such as Mica and Hungry Horse Dams, no SSARR routing is required, so ARF is not applicable. ARF is equal to A for the headwater projects. SSARR routing is required for all projects located downstream of headwater projects. For example:

CFM5ARF = HGH5A routed to CFM + CFM5L. where CFM5L is calculated as shown above, and:

KER5ARF = CFM5ARF routed to KER + KER5L. These procedures are continued downstream in determining the unregulated flows throughout the basin. Appendix E shows the routing details for all basins in the form of diagrams as well as equations, while Appendix F shows the routing coefficients used.

2.4.2 Negative Local Flows Negative local flows are often invalid but in some situations are accurate. There are several reasons for these negative flows to occur: (1) Surface Water – Groundwater Interconnections When surface water and groundwater are hydraulically connected, water can travel between a stream or other surface water body and the surrounding groundwater. For example, in a “losing reach” of a stream, the stream tends to leak water into the groundwater. In a “gaining reach,” groundwater tends to seep into the stream. Aquifers act as natural storage sources that are recharged annually in varying degrees. Except for spring runoff, the majority of water from streams comes from groundwater discharge. Discharge to the streams is controlled by the water pressure or “head” in the aquifer. Reduced head results from withdrawal by wells and reduced recharge. Reduced head in the aquifer results in lower stream flows. Examples of projects where negative flows attributed to surface water –groundwater interconnections occur include: Noxon Rapids and Cabinet Gorge on the Clark Fork; and Upper Falls on the Spokane River. USGS documentation of negative flow at Noxon Rapids Dam on the Clark Fork River is contained in the 2008 Surface Water Records Remarks paragraph for USGS Stream Gage Station #12391400—Clark Fork below Noxon Rapids Dam.

Page 10

USGS documentation of surface water and groundwater interaction along the Spokane River and the underlying Spokane Valley-Rathdrum Prairie was obtained (USGS, 2005a). The paper describes numerous interactions between the Spokane River and the underlying Spokane Valley-Rathdrum Prairie aquifer. (2) Evaporation Reservoir evaporation during summer low flow months can exceed the local or incremental flow that occurs between two adjacent stations. An example where this occurs is Fern Ridge Reservoir located in the Willamette Valley. This reservoir has very low inflow during the warm summer months. Lake evaporation exceeds the local inflow resulting in negative local inflow during these summer months. (3) Diversionary Water Uses Diversionary water uses are those that divert or pump water away from its source and consume all or a portion of the water. Diversionary water uses include irrigation, residential or domestic, and municipal uses. Irrigation is by far the largest consumptive water use in the Columbia River Basin. The magnitude of the irrigation diversion is, however, not large enough to result in negative local flows on most river reaches. (4) Inaccurate Project Data Observed reservoir elevations are sometimes inaccurate due to wind and wave action. For example at Flathead River, using the observed Flathead Lake elevation data results in calculated negative local flow for the reach located between the gaging stations Flathead River at Columbia Falls and the Flathead River near Polson, MT. Flathead Lake is a large reservoir which is located between these two gaging stations and has a surface area at full pool of 126,000 acres or 197 square miles. An error of 0.01 foot in observed reservoir elevation results in a daily computed local inflow error of 635 cfs. Wind and wave action at Flathead Lake can result in observed reservoir elevation differences of several tenths of a foot or more. During summer months inflow to Flathead Lake averages 400 to 600 cfs, so errors in reservoir elevation readings result in local inflow calculations that are negative or erratic. To obtain more realistic local flow values, “smoothing or indexing” is applied (Section 2.4.3). Sometimes project outflow data is the only discharge value available and is not accurate at certain locations and projects. The river reaches where project outflows are notably inaccurate are the Middle and Lower Columbia River hydroelectric projects. In such cases, stream gaging station data from tributary streams is sometimes used in lieu of project discharge data to compute local inflow. These situations are explained in Section 3 of this report.

2.4.3 Indexing Local Flows Indexing of the local flow is performed to smooth out daily flow values so that the computed local flow has a more reasonable hydrologic shape. This is feasible when stream gaging stations are located on tributaries within or adjacent to the local flow drainage area.

Page 11

The indexing steps are:

1. Compute the monthly average of the daily local flows. 2. Compute the monthly average of the daily flows for the index station or if

more than one station is utilized compute the monthly average of the combined index station flows.

3. Compute the ratio of the local monthly sum to the index monthly sum or local sum/index sum = F. This is computed for each month and the resulting F is used for that month.

4. Daily local or incremental flows are computed for each month by multiplying the F times the daily index flow.

5. If the computed monthly local flow volume is negative then that negative volume is converted to an average daily negative flow for the entire month.

The details of indexing for specific sites can be found in Appendix E.

2.5 D and DD Irrigation in the Columbia River Basin began prior to 1840. Since then there has been a significant increase in the amount of irrigated acres. In addition to the increase in irrigated acres there have been changes in the irrigation methods and the types of crops grown. In 1928 gravity/flood irrigation was the primary method of irrigation. Around 1950 sprinkler irrigation was first implemented and has since become the predominant method of irrigation. Because of the large changes in irrigation demand and application methods, it is necessary to make adjustments to the flows so that the historic flows represent current irrigation conditions. To accomplish this, incremental irrigation depletions (D) are calculated. Incremental depletions are an estimate of the differences between the actual depletion for a given year and the estimated depletion at the current level. The actual, historic depletions are inherently observed in the historic flow record. To calculate the increment from historic to current depletions, the difference between historic irrigated acres and current levels of irrigated acres is multiplied by the current estimate of depletion per acre. This can be represented as:

Di = da * (ΔI) Where, Di = incremental depletion, cfs da = depletion per unit area, cfs/1000 acres ΔI = incremental irrigated acres, 1000 acres

Page 12

This method assumes that all previous years were irrigated with the same crop distribution and method of water application as existed in 2007-2008. It also assumes the 30-year average climatic conditions in the basin from 1971 through 2000. The flows that occur in 2008 require no adjustment for irrigation because they reflect the current level of irrigation. In contrast, the 1928 flows often require the maximum adjustment because the irrigated area then was considerably less than today and the method of irrigation was less efficient (i.e. gravity versus today’s primarily sprinkler application). Incremental irrigation depletions are computed and applied to the routed flows (ARF) so that the historic flows reflect the irrigation depletions that would occur under present day conditions. A thorough explanation of the methodology used to calculate D is presented in Appendix C and areas with special depletion calculations are mentioned in Section 3. Tables of data used in calculating D’s are also shown throughout Section 3. At-site estimates of incremental depletions (D) reflect the effects of irrigation changes within a particular subarea of the Columbia basin. These effects carry downstream from subarea to subarea. To measure the net effect of all the upstream D, it is necessary to accumulate the incremental depletions to create a total depletion at each site (DD). Refer to equations throughout Section 3 for more details.

2.6 E and EE The construction of dams, with their reservoirs, increases the water surface area and provides greater opportunity for evaporation to occur. Part of the post-dam evaporation is offset by the evaporation from the pre-dam river surface. The area between the pre-dam river surface and the post-dam reservoir surface historically contained vegetation that removed water from downstream use through evapotranspiration. The at-site evaporation, due to the construction of a dam, is the difference between the post-dam reservoir evaporation and the pre-dam sum of river surface evaporation and vegetation evapotranspiration, in cfs. Incremental evaporation adjustments (E) were computed to adjust streamflows to a condition as if existing dams had all been constructed and evaporating water for the entire 80-year period 1928-2008. This evaporation adjustment was for the period July 1928 up to the time the reservoir first filled to 50 percent of usable storage capacity, and was the difference between post-dam reservoir evaporation and the pre-dam sum of river evaporation and vegetation transpiration. After initial filling, the reservoir evaporation is reflected in the observed streamflows. Incremental evaporation adjustments (E) reflect the effects of evaporation changes at a specific site. These effects carry downstream from site to site. To measure the net effect of the upstream E, it is necessary to accumulate the incremental evaporation adjustments to create a total evaporation at each site (EE). Refer to equations within Section 3 for more details.

Page 13

2.7 M Modified flows (M) are flows which have been adjusted to a common level of irrigation development and evaporation in upstream reservoirs and lakes, and reflect no regulation by dams. The most significant of these adjustments is the irrigation depletion adjustments. The 2010 level modified flows were computed at most locations by the addition of the depletion adjustments (D, DD) and the evaporation adjustments (E,EE) to the adjusted routed flows (ARF). At headwater locations, the adjustments (D and E) are added to the inflows (A) rather than to ARF because there is no routing and hence no ARF at the headwaters. At some locations, where there are no D, DD, E or EE values, modified flows simply equal the A or ARF values. Refer to equations throughout Section 3 for more details. At certain locations, modified flow values can be negative during instances when the evaporation (E, EE) and/or irrigation adjustments (D, DD) are larger than the calculated inflows (A) or routed flows (ARF). In these cases, it is likely that current levels of irrigation require more water than was historically observed. Modified flows are used by Pacific Northwest reservoir owners, Federal and State agencies to perform multiple purpose reservoir operation studies. Water conditions on the Columbia Basin vary widely depending on the precipitation that occurs. Successive drought years may occur or very high levels of precipitation may result in extremely high flows during the spring runoff. Reservoir regulation studies are used to develop operational guidelines so that system objectives such as power generation, flood control, recreation, fishery and wildlife objectives, and irrigation requirements can be met. Past experience, reflected in the historical flows, provide a wide range of conditions that have occurred and could reasonably be assumed to occur in the future. For this history to be useful for present and future studies, it is necessary to make appropriate adjustments to the historical flow records to make them reflect current conditions. For the 2010 Modified Flow study, the objective is to have 80 years of flows that are modified so that they can be used for operation studies, and they are modified to reflect flows that would occur under present day (2010) conditions. This study is based on irrigation depletion adjustments and modified flows for the 2010-year level of development for the 80-year period 1928-2008. Incremental depletion adjustments were computed for each year of the 80-year period to adjust the effects of actual irrigation each year up to that which would have been experienced with the irrigation as practiced in 2008. Water data users are cautioned that these modified flows are not comparable to recorded outflows, project inflows, or regulated flows. They have been developed for use in system regulation studies for optimizing the management of existing projects and for planning future projects, based on 2010-year conditions, and also to get the most beneficial use of the water supply and resources in the Pacific Northwest region. Equations showing how the final modified flow values are calculated for each site can be found in Section 3 of this report.

Page 14

Section 3 Discussion by Region The Columbia basin is divided into nine sections:

1. The Columbia and Kootenay in Canada and Kootenai in the U.S., 2. The Pend Oreille-Clark Fork and Spokane River Basins, 3. The Columbia River from the mouth of the Pend O’reille to the mouth of the

Snake River, 4. The Snake River above Brownlee Dam, 5. The Snake River Basin from Brownlee to the mouth, 6. The Columbia River from the mouth of the Snake River to Bonneville, and the

Closed Basin in Oregon, 7. The Willamette Basin, 8. The Lower Columbia tributaries, the Puget Sound drainage, and Coastal Streams

in Western Washington, and 9. The Klamath and Coastal Streams in Oregon

For the nine sections listed above, pertinent data related to the calculation of modified flows is provided. These data include:

An overview of the basin characteristics A map of the sub-basin with dams and gaging stations highlighted A list of data points Details about unique points The equations used to calculate L, ARF, DD, EE and M for each point

Page 15

3.1 Upper Columbia and Kootenay Basins The area described in this section includes the Columbia-Kootenay drainage above the mouth of the Pend Oreille River, near Trail, British Columbia. The Columbia drainage discussed in this section is located entirely within Canada. The Kootenay River (Kootenai in the U.S.) has its source in Canada, enters the U.S. in northwest Montana, and then flows back into Canada from northern Idaho. The drainage area of these two river basins above Trail, B.C., is 34,000 square miles; 28,000 in Canada and 6,000 in the U.S. See Section 3.1.1 for a map of the area. Most of the irrigated land in these two basins is located adjacent to the major rivers and lakes and their principal tributaries. Irrigation in the region has increased from 20,700 acres in 1928 to 36,600 acres in 2008. The method of application began changing after World War II from gravity to sprinkler. In 2008, approximately 86 percent of the irrigated lands used sprinkler systems. For the areas described above, irrigation depletion was computed based on water from surface sources. Groundwater sources were not considered because it was assumed that groundwater and surface water are not interconnected in these basins. Below is the list of areas where depletion adjustments were computed as described in Appendix C: (1) The Columbia above Mica, BC; (2) The Columbia from Mica to Keenleyside, BC; (3) The East Kootenay above Newgate, BC; (4) The Kootenai in Montana; (5) The Kootenai in Idaho; (6) The West Kootenay from the Idaho Border to Corra Linn, BC; (7) The Slocan Basin; and (8) The Columbia from Keenleyside, BC to the mouth of the Pend Oreille. Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.1.4. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D.

Page 16

3.1.1 Regional Map Figure 3-1. Upper Columbia and Kootenay Basin Map

Page 17

3.1.2 List of Points Table 3-1. Upper Columbia and Kootenay Basin Points

id name basin H S A L ARF D DD E EE M MCD Mica Upper Columbia x x x x x x RVC Revelstoke Upper Columbia x x x x x x x x x ARD Hugh Keenleyside Upper Columbia x x x x x x x x x x LIB Libby Kootenay x x x x x x BFE Bonners Ferry Kootenay x x x x DCD Duncan Kootenay x x x x x COR Corra Linn Kootenay x x x x x x x x CAN Kootenay Canal Kootenay x UBN Upper Bonnington Kootenay x LBN Lower Bonnington Kootenay xSLO Slocan Kootenay x BRI Brilliant Kootenay x x x x x x MUC Murphy Creek Upper Columbia x x x x x UPC Upper Columbia above Mica Upper Columbia x CTR Columbia at Trail Upper Columbia x x EKO East Kootenay above Newgate Kootenay x KMT Kootenai-Montana Kootenay x KID Kootenai-Idaho Kootenay x WKO West Kootenay Kootenay x

x

x

3.1.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Mica, Revelstoke, Arrow and Duncan, BC (MCD, RVC, ARD, DCD) - British Columbia Hydro and Power Authority (BCHydro) made revisions to historic flow data at the Canadian dams starting from the 1960s. This revised historic data as well as the new nine years of data were provided by BCHydro consist of outflows, storage, and calculated local flows. The earliest of these data revisions start on 1 Jan 1961 at Arrow Dam, so Canadian flows were recalculated and rerouted from 1 Oct 1960 (WY 1961) onward. Inflows at the four dams were not provided, so they were calculated as follows. At the headwater projects Mica and Duncan, the local flow equals the total project inflow. At Revelstoke and Arrow, the local flow was added to the upstream project’s routed outflow to obtain total project inflow. Arrow, BC (ARD) – The Arrow local inflows provided by BCHydro does not include the inflows into Whatshan Dam. Whatshan Dam is located between the Upper and Lower Arrow Lakes. Therefore its inflow is added to the local flows provided by BCHydro to create the total Arrow local flows:

Total Arrow Local flow (ARD5L) = Arrow Local flow from BCHydro + Whatshan Inflow. Whatshan Dam inflow data was available from BCHydro from Jan 1974 to Sep 2008. From Jan 1970 to Dec 1973 it was calculated by taking the daily averages from the 1974-2008 data.

Page 18

On a side note, local flows were calculated separately to see how they compare with the local flows provided by BCHydro:

ARD5L = ARD5A – RVL5H routed to ARD, where ARD5A = ARD5S (Upper plus Lower Arrow Lake storage) + ARD5H

The local flows calculated this way did not match the local flows from BCHydro. This difference was acknowledged by BCHydro and a decision was made to continue using the provided dataset. The Whatshan inflows were thus added on to this dataset Duncan, BC (DCD) -- The new Duncan outflow dataset BCHydro provided was different from the previous dataset DCD4H from 01/01/84 onward. The DCD5H data was compared to the DCD4H data, the generator turbine discharge data (provided by BCHydro), and the stream gage 08NH126 data to evaluate the differing datasets for quality. The data that fit best from these three sources (DCD4H, generator turbine discharge, or stream gage 08NH126) was used for the final DCD5H. Corra Linn, BC (COR) – Corra Linn outflow data (COR5H) was available from two sources: BCHydro (outflow from Kootenay Lake) and Water Survey of Canada (gage data – 08NJ158). There were differences between these two datasets due to different methods of calculating the same flows. Upon review, neither dataset appeared to be better than the other. A decision was made to use the outflows provided by Water Survey of Canada because it had less data entry errors and was the data source used in the previous study. COR5S for this study was also available from the same two sources: BCHydro (as Kootenay Lake storage data) and Water Survey of Canada (as Kootenay Lake at Queens Bay lake elevation data – 08NH064). The lake elevation from 08NH064 was converted to storage using the elevation-storage table KOO (Appendix G). In the previous study, lake elevations were obtained from the USACE database, which was available only through Dec 1999. Data for all the three sources were compared, and it was found that the data from the USACE database and Water Survey of Canada compared well; the BCHydro data was not similar, and local flows (COR5L) calculated using BCHydro storage data were unrealistic and varied widely. Therefore, the 08NH064 data from Water Survey of Canada was used as the final COR5S data from 10/1/1999-9/30/2008. COR_L was calculated per the usual way described in Section 2.4 for all years except 1/1/984 to 9/30/1999. This is because the new revised Duncan Dam outflow (DCD_H) obtained from BCHydro was different from the outflow used in the 2000-Level study between 1/1/984 and 9/30/1999. Typically, DCD_H is used in calculating COR_L as:

COR_L = COR_A – [(BFE_H routed to COR) + DCD_H]

Page 19

But because of the new revised Duncan outflow data, and because it was impossible to replicate the routing of BFE before Oct 1999, COR_L from 1/1/984 to 9/30/1999 was determined as:

COR_L = 2000-Level COR_L + 2000-Level DCD_H – new revised DCD_H The above equation basically adds the difference between the old and new Duncan dam outflows to the old Corra Linn locals. For the time period 1/1/984 to 9/30/1999, COR_A values were also adjusted to reflect the changes to the COR_L data so that the individual components of the first COR_L equation shown above add up. The adjustments to COR_A were made by altering the COR_S values (COR_A = COR_H + COR_S), and are equal to the difference between the old and new revised Duncan outflow data. In examining the COR5L period of record from the 1960’s to 2008, there were some instances where the local flow values were negative. These negative values were corrected by increasing the COR5S values until more reasonable COR5L values were obtained. Whenever the storage values were increased on one date, they were decreased by the same amount on a different date to maintain the water mass-balance. Because only a small number of the calculated local flows were negative, smoothing was done using this small scale correction method rather than the typical method of indexing to nearby streams (described in Section 2.4.3). Bonners Ferry, MT (BFE) –Typically, the observed flow at Bonners Ferry (BFE5H) is used in calculating local flow (BFE5L). However, BFE5H are unreliable due to back water effects from Kootenay Lake. Therefore, BFE5L is instead calculated as outlined below. To calculate BFE5L, a new point that had more reliable gage data compared to Bonners Ferry was added to the routing. This new routing point is at Leonia (LEO), MT, which is not an official modified flow point. Leonia is located between Libby Dam and Bonners Ferry and the following steps show how LEO5H and LEO5L are calculated. The use of LEO5H and LEO5L in calculating BFE5L follows this discussion. There are two ways to obtain LEO5H:

(1) There is a USGS gage at Leonia (Kootenai River at Leonia ID, 12305000), but the data from it is not as reliable for flows above 16000 cfs, as noted by USGS. Also, using this gage data directly yielded negative locals (LEO5L) for certain periods, which is undesirable. So an alternative way to obtain LEO5H is to calculate it as shown in (2).

(2) It can also be calculated as:

LEO5H = LIB5H routed to Leo + 1.718*{Yaak 5H (USGS #12304500) + Fisher 5H (USGS #12302055)}

Page 20

The 1.718 factor = (Total Local Drainage Area) / (Drainage area gaged by Yaak & Fisher). This factor is to account for the whole drainage area between Libby and Leonia assuming that the Yaak & Fisher gage data are representative. When (1) and (2) were compared, (1) yielded larger flows than (2) most of the time. Therefore, using just (2) for the entire nine year period would skew the data to lower values and thus underestimate the true flow. On the other hand, using only (1) created negative local flows above Leonia (LEO5L). It was found that the negative local flows due to using (1) alone occurred during the few instances where (2) was larger than (1). Therefore the solution was to take the higher value of (1) or (2) to be the final LEO5H value. Even after taking the higher of the two values, there where still some negative LEO5L that were corrected by altering LEO5H.

A local flow is calculated at LEO as shown below. This LEO5L contributes towards the calculation of BFE5L.

LEO5L = LEO5H – LIB5H routed to LEO

On days when the 5L values were negative, to make the 5L values into positive numbers, LEO5H was adjusted accordingly in such a way that volumes were preserved. The next set of equations show how the above calculated LEO5H and LEO5L are used in finding BFE5L.

BFE5L = LEO5L routed to BFE + local inflow between BFE and LEO The local inflow between BFE and LEO is calculated as shown in the table below: Local inflow between Bonners Ferry and Leonia = USGS 12306500*a + b Where USGS 12306500 = Moyie River @ Eastport, ID Table 3-2. Regression Coefficients Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.387 1.67 1.518 1.787 2.093 1.505 1.396 1.301 1.414 2.114 1.662 1.347b 57.38 27.09 77.85 31.66 -13.2 80.38 166.5 248.2 350.3 75.54 34.41 32.45 Therefore:

BFE5L = LEO5L routed to BFE + (USGS 12306500*a + b)

BFE5H was then back-calculated from BFEL as such:

BFE5H = LEO5H routed to BFE + BFE5L

Page 21

3.1.4 Equations The equations used in the calculation of local flows, adjusted routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and adjusted routed flows, refer to the Routing Diagram in Appendix E A full list of abbreviations can be found in Section 3.1.2 and in Appendix A. Data type definitions can be found in Section 1.3. Local Flows (L): RVC5L = BCHydro provided quality controlled data ARD5L = BCHydro provided quality controlled which includes Whatsan MUC5L = MUC5H – [(ARD5H + BRI5H) routed to MUC] BFE5L = BFE5H - (LIB5H routed to BFE) COR5L = COR5A – [(BFE5H routed to COR) + DCD5H] BRI5L = BRI5H – COR5H Adjusted Routed Flows (ARF): RVC5ARF = (MCD5A routed to RVC) + RVC5L ARD5ARF = (RVC5ARF routed to ARD) + ARD5L MUC5ARF = [(ARD5ARF + BRI5ARF) routed to MUC] + MUC5L BFE5ARF = (LIB5A routed to BFE) + BFE5L COR5ARF = (BFE5ARF routed to COR) + DCD5A + COR5L BRI5ARF = COR5ARF + BRI5L Accumulated Depletions (DD): MCD5DD = UPC5D RVC5DD = UPC5D + (0.35) ARD5D ARD5DD = UPC5D + ARD5D LIB5DD = EKO5D + (0.85) KMT5D BFE5DD = EKO5D + KMT5D COR5DD = EKO5D + KMT5D + KID5D + WKO5D BRI5DD = COR5DD + BRI5D MUC5DD = ARD5DD + BRI5DD + (0.45) CTR5D CTR5DD = ARD5DD + BRI5DD + CTR5D Accumulated Evaporation (EE): RVC5EE = RVC5E + MCD5E ARD5EE = RVC5EE + ARD5E COR5EE = LIB5E + DCD5E MUC5EE = ARD5EE + COR5EE Modified flows (M): MCD5M = MCD5A + MCD5DD + MCD5E RVC5M = RVC5ARF + RVC5DD + RVC5EE ARD5M = ARD5ARF + ARD5DD + ARD5EE LIB5M = LIB5A + LIB5DD + LIB5E BFE5M = BFE5ARF + LIB5E + KMT5D + EKO5D DCD5M = DCD5A + DCD5E COR5M = COR5ARF + COR5DD + COR5EE CAN5M = COR5M UBN5M = COR5M

Page 22

LBN5M = COR5M SLO5M = COR5M BRI5M = BRI5ARF + BRI5DD + COR5EE MUC5M = MUC5ARF + MUC5DD + MUC5EE

Page 23

3.2 Pend Oreille & Spokane Basins The area described in this section includes the Pend Oreille River and the Spokane River basins. Both of these streams are major tributaries to the Columbia River above Grand Coulee Dam. The Pend Oreille-Clark Fork basin drains 25,800 square miles in Montana, Idaho, Washington, and British Columbia. The Spokane River drains 6,200 square miles in Idaho and Washington. See Section 3.2.1 for a map of the area. Irrigation is concentrated in the valleys of the Flathead, Bitterroot, Clark Fork above St. Regis, and Spokane Rivers. Irrigation supplied by surface water in the area has increased from 317,000 acres in 1928 to 402,000 acres in 2008. Most of the irrigation is for hay and pasture lands, although some irrigation is for the production of grain, sugar beets, potatoes, fruit, and vegetables. Use of sprinklers has increased markedly in recent years. In the Pend Oreille-Clark Fork Basin, irrigation depletion was computed based on water from surface sources. Groundwater sources were not considered because it was assumed that the groundwater and surface water are not interconnected in this basin. In the Spokane Basin, though, groundwater plays an important part. In the Spokane Basin, the groundwater is basically an underground river that interfaces with the Spokane River. Thus all irrigated lands in this basin, regardless of water supply source, were included in the determination of the irrigation adjustment. The Spokane River and the underlying Spokane Valley-Rathdrum Prairie Aquifer are highly interconnected with water flowing back and forth between the two along numerous reaches of the Spokane River (USGS, 2005a). The water supply source for irrigation has essentially been converted from surface water, via the Rathdrum Prairie and Spokane Valley Farms canals, to groundwater pumping. Streamflow modifications were computed by adding historical canal diversions and subtracting 2010 level adjustments. Early in the century, the Spokane Valley Farms canal was installed to divert water from the Spokane River for irrigation downstream from Lake Coeur d’Alene. Monthly diversions averaged about 250 cfs from June to August and somewhat smaller amounts in May and September. In 1946, the Rathdrum Prairie Canal began diverting water to the first unit of the Rathdrum Prairie Project. These diversions averaged 45 cfs in June, July and August, and 25 cfs in May and September. In 1968, the Spokane Valley Farms Canal was abandoned and the irrigation project was supplied by groundwater pumping. Adjustment for irrigation in the Spokane Basin was made by adding back the historical diversions from the Spokane Valley Farms Canal and the Rathdrum Prairie Canal for the entire period of record and subtracting the 2010 level of adjustment. Below is the list of areas where depletion adjustments were computed as described in Appendix C. (1) The Upper Clark Fork and Blackfoot River Basins above Missoula

(2) The Bitterroot River Basin (3) The Lower Clark Fork from Missoula to Lake Pend Oreille (4) Privately developed land upstream from the Flathead Indian Reservation

Page 24

(5) The Flathead Reservation from Flathead Lake to Plains (6) The Pend Oreille Basin in Idaho and Washington from Cabinet Gorge to

the Canadian border (7) The Salmon River (tributary to the Pend Oreille) in British Columbia; the

Pend d’Oreille River in British Columbia, Canada (8) The Spokane River Basin from Lake Coeur d’Alene to the Columbia

River

Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.2.4. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D.

Page 25

3.2.1 Regional Map

Figure 3-2. Pend Oreille and Spokane Basin Map

Page 26

3.2.2 List of Points Table 3-3. Pend Oreille and Spokane Basin Points

id name basin H S A L ARF D DD E EE M HGH Hungry Horse Pend Oreille x x x x x CFM Columbia Falls Pend Oreille x x x KER Kerr Pend Oreille x x x x x x x TOM Thompson Falls Pend Oreille x x x x x x x NOX Noxon Rapids Pend Oreille x x x x x x x x x CAB Cabinet Pend Oreille x x x x x x x PSL Priest Lake Pend Oreille x x x x ALF Albeni Falls Pend Oreille x x x x x x x BOX Box Pend Oreille x x x x x x x BDY Boundary Pend Oreille x x x x x x x SEV Seven Mile Pend Oreille x x x x x x x WAT Waneta Pend Oreille x x x x x COE Coeur D'Alene Spokane x x x x x PFL Post Falls Spokane x UPF Upper Falls Spokane x x x MON Monroe Street Spokane x NIN Nine Mile Spokane x x LLK Long Lake Spokane x x x x x LFL Little Falls Spokane x SUV Sullivan Lake Pend Oreille x x FLT Upper Flathead Pend Oreille x FID Flathead Irrigation District Pend Oreille x BIT Bitterroot Pend Oreille x UCF Upper Clark Fork Pend Oreille x LCF Lower Clark Fork Pend Oreille x PEN Pend Oreille Pend Oreille x POC Pend Oreille in Canada Pend Oreille x RAT Rathdrum Prairie Canal Spokane x SPV Spokane Valley Spokane xSPO Spokane Valley Farms Canal Spokane x

x

x

x

3.2.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Sullivan Lake, WA (SUV) – Inflow (A) into Sullivan Lake was calculated for the period July 1928 through September 2008 using a linear relationship between Priest Lake inflows and estimated Sullivan Lake inflows provided by Pend Oreille PUD. The lake inflows were available for the periods 1961-1971 and 1994-2002. This period was used to develop the linear relationship to calculate the inflow into Sullivan Lake. However, calculated inflows had numerous negative values. Because negative flows and very small flows were considered unreasonable, flows below 10 cfs were replaced with the mean flow for that day of year based on the Pend Oreille PUD inflows. Monthly volumes for the 1928-2008 inflows were then compared to the Pend Oreille monthly volumes and each daily value was bias corrected so that the volumes matched. .

Page 27

Priest Lake, ID (PSL) – Inflows were calculated based on flow from USGS gage ‘12394000 Priest River near Coolin, ID’. Since this gauge is downstream of the project, the flow at 12394000 was reduced to better match the expected outflow at the project. The equation used was:

Outflow at Priest Lake = USGS 12394000 – 0.134*(USGS12394000 – USGS 12395000). USGS gage ‘12395000 Priest River near Priest River, ID’ is located downstream of USGS 12394000 and the 0.134 factor is the ratio of the drainage area between Priest Lake to 12394000 and 12394000 to 12395000. Also to note, gage 12394000 was discontinued at the end of the 2006 water year. To calculate inflows for the remaining period of 1 October 2006 through 30 Septmeber 2008, a monthly correlation was performed to extend the record at gage 12394000. The table below shows the results of this correlation. Table 3-4. Regression Coefficients USGS 1239400 = USGS 12395000*a + b

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.943 0.848 0.714 0.652 0.574 0.572 0.621 0.772 0.872 0.885 0.829 0.934b -83.2 -54.3 -0.7 23.1 104.1 -14.9 -8.6 120.7 -94.6 -129.6 -80.6 -115.1

Box Canyon and Boundary, WA (BOX, BDY) – Local flows at Box Canyon, WA and Boundary, WA were determined to be incorrect when calculated from project data. When positive local flow values were observed at one site, it was common to observe negative local flows of a similar magnitude at the other site. To avoid using the erroneous project data at Box and Boundary, local flows were calculated by routing outflow from Albeni Falls (ALF) directly to BDY, bypassing BOX, and then creating an ALF to BDY local flow. This total local flow was then proportioned into a BOX local and BDY local by using the percentage of their drainage areas to the total of the drainage area between BDY and ALF (0.7 for BOX, 0.3 for BDY). This methodology is applicable for the most recent nine years of data. Therefore from 1999-2008, observed project outflow values at BOX and the corresponding inflow values were not used in the calculation of BOX or BDY locals as was done in the past. Seven Mile, BC (SEV) – Outflow data from Seven Mile, BC was not available so it was calculated from change in storage data and inflow into the project:

SEV5H = SEV5A – SEV5S. where SEV5A = USGS 12398600 + Water Survey Canada 08NE074 Inflow was estimated as the sum of USGS gage ‘12398600 Pend Oreille River at International Boundary’ and Water Survey of Canada gage #08NE074. In previous

Page 28

modified flow studies the USGS gage #12398600 was used for the Seven Mile project although the gage is located upstream of Seven Mile. Spokane Valley Irrigation, WA (SPV, RAT and SPO) – Irrigation depletions in the Spokane Valley, north and west of Post Falls dam, are accounted in three depletion datasets – SPV5D, RAT5D and SPO5D. The incremental depletion values in SPV5D are determined as described in Appendix C. RAT5D and SPO5D are records of historical diversions from the Spokane River which are obtained from gaged USGS data. RAT5D is the historical diversion from the Spokane River to the first unit of the Rathdrum Prairie Project in the Spokane Valley. The data is obtained from USGS Gage #12418000, which was in place from April 1946 to September 1992. SPO5D is the historical diversion from Spokane River for the Spokane Valley Farm area. This data is obtained from USGS Gage #12418500, which was in service from July 1928 to September 1966.

Page 29

3.2.4 Equations The equations used in the calculation of local flows, adjusted routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and routed flows, refer to the Routing Diagram in Appendix E. A full list of abbreviations can be found in Section 3.2.2 and in Appendix A. Data type definitions can be found in Section 1.3. Local Flows (L): CFM5L = CFM5H – (HGH5H routed to CFM5H) KER5L = KER5A – (CFM5H routed to KER) TOM5L = TOM5H – (KER5H routed to TOM) NOX5L = NOX5A – (TOM5H routed to NOX) CAB5L = CAB5A – (NOX5H routed to CAB) ALF5L = ALF5A – ((CAB5H + PSL5H) routed to ALF) (BOX + BDY)5L = BDY5A – (ALF5H routed to BDY) BOX5L = 0.7 * (BOX + BDY)5L BDY5L = 0.3 * (BOX + BDY)5L SEV5L = Salmo River near Salmo UPF5L = UPF5H – (COE5H routed to UPF) NIN5L = NIN5H – (UPF5H routed to NIN) LLK5L = LLK5A – (NIN5H routed to LLK) Adjusted Routed Flows (ARF): CFM5ARF = (HGH5A routed to CFM) + CFM5L KER5ARF = (CFM5ARF routed to KER) + KER5L TOM5ARF = (KER5ARF routed to TOM) + TOM5L NOX5ARF = (TOM5ARF routed to NOX) + NOX5L CAB5ARF = (NOX5ARF routed to CAB) + CAB5L ALF5ARF = ((CAB5ARF + PSL5A) routed to ALF) + ALF5L BOX5ARF = (ALF5ARF routed to BOX) + BOX5L BDY5ARF = (BOX5ARF routed to BDY) + BDY5L SEV5ARF = BDY5ARF + SEV5L WAT5ARF = SEV5ARF + WAT5S UPF5ARF = (COE5A routed to UPF) + UPF5L NIN5ARF = (UPF5ARF routed to NIN) + NIN5L LLK5ARF = (NIN5ARF routed to LLK) + LLK5L Accumulated Depletions (DD): KER5DD = FLT5D + FID5D TOM5DD = FLT5D + FID5D + UCF5D + BIT5D + (0.84) LCF5D NOX5DD = TOM5DD + (0.16) LCF5D CAB5DD = NOX5DD ALF5DD = CAB5DD + (0.72) PEN5D BOX5DD = CAB5DD + PEN5D BDY5DD = BOX5DD SEV5DD = BDY5DD + POC5D COE5DD = RAT5D + SPO5D UPF5DD = COE5DD + SPV5D

Page 30

Accumulated Evaporation (EE): NOX5EE = NOX5E + HGH5E Modified flows (M): HGH5M = HGH5A + HGH5E CFM5M = CFM5ARF + HGH5E KER5M = KER5ARF + KER5DD + HGH5E TOM5M = TOM5ARF + TOM5DD + HGH5E NOX5M = NOX5ARF + NOX5DD + NOX5EE CAB5M = CAB5ARF + CAB5DD + NOX5EE PSL5M = PSL5A ALF5M = ALF5ARF + ALF5DD + NOX5EE BOX5M = BOX5ARF + BOX5DD + NOX5EE SUV5M = SUV5A BDY5M = BDY5ARF + BDY5DD + NOX5EE SEV5M = SEV5ARF + SEV5DD + NOX5EE WAT5M = WAT5ARF + SEV5DD + NOX5EE COE5M = COE5A + COE5DD PFL5M = COE5M UPF5M = UPF5ARF + UPF5DD MON5M = UPF5M NIN5M = NIN5ARF + UPF5DD LLK5M = LLK5ARF + UPF5DD LFL5M = LLK5M

Page 31

3.3 Mid-Columbia Basin The mid-Columbia region consists of lands in and around Grand Coulee Dam to Priest Rapids Dam, including the Okanagan and Kettle basins in British Columbia. Irrigation from surface water in Canada increased between 1928 and 2008 by 3,200 acres in the Kettle Basin and decreased by 17,600 acres in the Okanagan/Similkameen Basin. In the U.S. above Grand Coulee Dam, the increase in surface water irrigation in the Ferry-Stevens counties area was 11,300 acres. The irrigated acreage in the Methow Basin and the U.S. portion of the Okanogan Basin (effective at Wells Dam) decreased by about 8,000 acres in the last nine years. See Section 3.3.1 for a map of the area.

The remaining land area is referred to as the Big Bend Area. This is the area that is east and south of the Columbia River, where the river makes its “Big Bend”. Lands within the “Big Bend” are: The Columbia Basin Project, lands west of Banks Lake (mentioned above), and lands east of the Columbia Basin Project, herein called Big Bend East.

Irrigated lands in the Big Bend East area are located on the high plateau east of the Columbia Basin Project. Water supply is derived from both groundwater and surface sources. The surface/groundwater barrier is generally impermeable in this area, so groundwater pumping is considered as water mining. Surface streams through this semi-arid area are discontinuous and intermittent. Irrigation in this area does not have return flow or depletion impacts on the Columbia River flows, and is not appropriate for inclusion in the study. Irrigated acreage includes both surface and groundwater for this subarea.

Lands irrigated in the area west of Banks Lake are located along the Columbia River, thus diversions and return flows are treated as if the Columbia was the direct water source. The irrigation west of Banks Lake is combined with the irrigation in the Chelan, Entiat and Wenatchee Basins, and the total irrigation depletions are applied between Chief Joseph and Rock Island Dams. Irrigated lands increased by 61,800 acres in these basins between 1928 and 2008. For the areas described above, irrigation depletion was computed based on water from surface sources. Groundwater sources were not considered because it was assumed that the groundwater and surface water are not interconnected in this basin. Below is the list of areas where depletion adjustments were computed as described in Appendix C. Apart from these areas, the Yakima Basin and Columbia Basin Project Area also affect the irrigation depletion in this basin.

(1) The Kettle River in Canada (2) The Okanagan River in Canada (3) The Ferry-Stevens counties above Grand Coulee Dam (4) The Methow and Okanogan Basins

Page 32

(5) The Chelan, Entiat and Wenatchee Basins along with the area “West of Banks Lake”

Also of special mention in the mid-Columbia basin is the change in the methodology used to calculate local flows joining the Columbia River between Chief Joseph and Priest Rapids Dams. This is discussed in detail in Section 3.3.4. Irrigation is extensively practiced in the Yakima Basin. In 2008, there were 465,000 acres irrigated from surface water, and the incremental increase from 1928 to 2008 was 132,000 acres. As of 2008, water application is 66 percent by sprinkler in the Yakima Basin. Because of the use of storage reservoirs and intensive water use, a special study was conducted by the USBR to determine irrigation adjustments for the Yakima Basin. The Yakima Basin study is described in the Supplemental Report included. The output from this special study was a set of regulated 2010 level modified streamflows at the mouth of the Yakima River. The Yakima River observed flows (5H) were subtracted from the regulated flows (5R) provided from the USBR to arrive at a depletion adjustment for the Yakima River. This adjustment is applied to modified flows at McNary Dam. The Columbia Basin Project supplies irrigation water for over 671,000 acres. Water is pumped from Franklin D. Roosevelt (FDR) Lake behind Grand Coulee into the equalizing reservoir Banks Lake. From there, water is routed through the project distribution system. Return flows from the northern portion of the project flow to the Potholes Reservoir, where they are reused to irrigate other project lands. Return flows from the project re-enters the main river system into Wanapum (WRF5D), Priest Rapids (PRF5D), and McNary (MRF5D) Reservoirs. Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.3.5. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D.

Page 33

3.3.1 Regional Map

Figure 3-3. Mid-Columbia Basin Map

Page 34

3.3.2 List of Points Table 3-5. Mid-Columbia Basin Points

id name basin H S A L ARF D DD E EE M GCL Grand Coulee Mid-Columbia x x x x x x x x x x CHJ Chief Joseph Mid-Columbia x x x x x x x x WEL Wells Mid-Columbia x x x x x x x x x CHL Chelan Mid-Columbia x x x x RRH Rocky Reach Mid-Columbia x x x x x x x x x RIS Rock Island Mid-Columbia x x x x x x x WAN Wanapum Mid-Columbia x x x x x x x x PRD Priest Rapids Mid-Columbia x x x x x x x x x YAK* Yakima Mid-Columbia x x FDR** Franklin D. Roosevelt Lake Mid-Columbia OKA Okanagon in Canada Mid-Columbia x OKM Methow-Okanagan Mid-Columbia x KET Kettle Mid-Columbia x FER Ferry-Stevens Mid-Columbia x CEW Chelan-Entiat-Wenatchee-West of

Banks LakeMid-Columbia x

WRF Wanapum Return Flow Mid-Columbia x PRF Priest Rapids Return Flow Mid-Columbia x

x

*YAK has an additional data type, R, which is flow data provided by the USBR (Supplemental Report) **FDR has two additional data types: G and P, which are generation and pumping flow data (Section 3.3.3)

3.3.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Grand Coulee, WA (GCL) – A pumping plant diverts flow from the reservoir behind Grand Coulee Dam, Franklin D. Roosevelt Reservoir, into Banks Lake, where it is stored for irrigation flows for the USBR Columbia Basin Project. Water is also returned periodically from Banks Lake to Franklin D. Roosevelt Reservoir for power generation. The datasets which contain the Grand Coulee diversion (pumping) and return flow from power generation are FDR5P and FDR5G, respectively. FDR5P values are positive while FDR5G values are negative. The pumping and generation are accounted in the calculation of inflows into Grand Coulee dam as:

GCL5A = GCL5H + GCL5S + FDR5P + FDR5G Also of note is the GCL5D dataset. Irrigation depletions at Grand Coulee Dam are, in effect, the net water removed from the river for the irrigation that occurs in the Columbia Basin Project. An estimated 2010 level diversion schedule of how much net water was removed from Franklin D. Roosevelt Lake into Banks Lake was derived by averaging the difference between the pumping data in FDR5P and the return flow generation data in FDR5G for the last three water years of this 1928-2008 study. In other words, it is the last three years’ average of (FDR5P minus FDR5G). The result of this averaging is the GCL5D dataset.

Page 35

Chelan, WA (CHL) – Initially inflows at Chelan dam (CHL5A) were calculated as:

CHL 5A = CHL5S + CHL5H, but this produced choppy and unrealistic hydrographs. Therefore inflows were indexed against a neighboring stream to smooth the flows to more realistic values. CHL5A was indexed against USGS Gage Stehekin River at Stehekin, WA (#12451000). Indexing was done for all the years from 1928 until 2008, but only the most recent 10 years (1999-2008) were routed through the ResSim model. The previous 70 years of newly indexed 5A flows were not routed again because the monthly averages of these flows are the same pre- and post- indexing. Wells, Rocky Reach, Rock Island, Wanapum, and Priest Rapids, WA: Locals, Inflows and Outflows (WEL, RRH, RIS, WAN, PRD) – In this 2010 study, a new methodology was used to calculate local flows in the river reach between Chief Joseph and Priest Rapids Dams, as explained in detail in the next section. The changes to the 5L values also created revisions to the 5A and 5H values. The new method was used to calculate these values beginning in WY 1960, for the 49 years of data from WY 1960 – WY 2008. All 49 years of data were routed using the ResSim model. Yakima, OR (YAK) – Regulated “modified” flows at Yakima are provided by the USBR (Supplemental Report) and are denoted as data type YAK5R. Note that these flows are different from 5M values. Irrigation depletions are already accounted for in YAK5R, but are not available from the USBR as a separate dataset. The following calculation was used to create a YAK5DD record. YAK5DD is created because it is a component in the calculation of MCN5DD (Section 3.6.4).

YAK5DD = YAK5R – YAK5H

where YAK5H is data from USGS gage Yakima River at Kiona WA,12510500. YAK5DD is one of the three locations where DD values should not be compared directly with the 5DD values at other sites in the Columbia River Basin because they are calculated differently. The other two locations with different DD calculations include BRN5DD and ROU5DD.

Page 36

3.3.4 Mid-Columbia Locals Methodology

3.3.4.1 Introduction Local flows at the mid-Columbia river reach, calculated as described in Section 2 produced values with numerous negative numbers, odd flow shapes, and atypical magnitudes even after indexing. These issues were present in the past studies as well. Therefore, an alternate method was proposed to the PNCA Coordinating Group and after their approval, was used to calculate the mid-Columbia locals for this study. This alternate method affects the inflows, outflows, routed flows, and modified flows at the following mid-Columbia points:

Wells (WEL), Rocky Reach (RRH), Rock Island (RIS), Wanapum (WAN), and Priest Rapids (PRD).

Initially, the local inflows were calculated using both the old and alternate methods for the years 2000-2008 and a comparison was made. Based on the improved results using the alternate method for these nine years, a decision was made by the PNCA Coordinating Group to use the alternate method to calculate local flows beginning in WY 1960. WY 1960 is prior to when the mid-Columbia dams were built and when the calculated local flows started looking unrealistic. All 49 years of new data created from this alternate method was routed by the ResSim model. The starting point of the alternate method is Chief Joseph Dam, and the ending point is Priest Rapids Dam. The following section shows the comparison of the local flows calculated using the old and alternate methods for the years 2000 through 2008. Details of the old and alternate methods are described in Sections 3.3.4.3 and 3.3.4.4.

3.3.4.2 Comparison of Old vs. New Method from 2000 through 2008 The locals as calculated by the alternate/new method are plotted alongside the locals as calculated by the old method for WY 2000 – 2008 (Figure 3-4, Figure 3-5, Figure 3-6, Figure 3-7, Figure 3-8). This data comparison is shown only for the most recent nine years because it is based on these comparisons that the PNCA Coordinating Group elected to recalculate the locals for the WY 1960-2008 period. Only nine years of data is shown in this comparison section also because it is easier to notice any differences between the old and new data over this shorter time frame compared to showing the data for all 49 years.

Page 37

Figure 3-4. Wells Dam Old Locals vs. New Locals The old method local flow had negative values even after indexing, while the new method does not. Both local flows have comparable flow magnitudes when flows exceed 5000 cfs.

Page 38

Figure 3-5. Rocky Reach Dam Old Locals vs. New Locals The old method local yielded severe negative values even after indexing and it also had an atypical runoff shapes. The new method does not have any negative values and has a normal runoff shape.

Page 39

Figure 3-6. Rock Island Dam Old Locals vs. New Locals The old method local had negative values even after indexing, while the new method does not. Both local flows have comparable flow magnitudes when flows exceed 5000 cfs.

Page 40

Figure 3-7. Priest Rapids Dam Old Local vs. New Locals The old method local had some negative values even after indexing and the magnitude was much greater than reasonable since 87 per cent of the drainage area between Wanapum and Priest Rapids is gaged by the USGS 12472600 Crab Creek near Beverly stream gage. The new method yields a realistic runoff shape and magnitude. The new method local is shown below at higher flow magnification.

Page 41

Figure 3-8. Priest Rapids New Locals

3.3.4.3 2000 Level/ Old Method The method used to calculate local flows in the 2000 level study is as described in Section 2. The local flows calculated using this old method had significant negative numbers and/or poor runoff shapes, and were therefore indexed to neighboring streams. The indexing process adjusts the shape of the local calculated flow based on neighboring streams but retains the same monthly volume. Details specific to the mid-Columbia locals as calculated previously by the old method are shown below. Wells Loca Flow: WEL5L = WEL5A – (CHJ5H routed to WEL) WEL5L was indexed to Okanogan River at Tonasket,WA (USGS #12445000) & Methow River at Pateros (USGS #12449950) Rocky Reach Local Flow: RRH5L = RRH5A – ((WEL5H routed to RRH) + CHL5H) RRH5L was indexed to Wenatchee River at Peshastin, WA (USGS #12459000) Outflow from the Chelan dam (CHL5H) joins the Columbia River between Wells dam and Rocky Reach dam and is subtracted from the Rocky Reach inflows along with the Wells dam outflows routed to Rocky Reach. Chelan outflow is not considered part of the local flows between Wells and Rocky reach because it is routed separately to Rocky Reach dam. Rock Island Local Flow: RIS5L = RIS5A – (RRH5H routed to RIS) RIS5L was indexed to Wenatchee River at Peshastin, WA (USGS #12459000)

Page 42

Wanapum Local Flow: Considered negligible; not calculated or indexed Priest Rapids Local Flow: PRD5L = PRD5A – (WAN5H routed to PRD) where WAN5H = (RIS5H routed to WAN) – WAN5S PRD5L was indexed to Wenatchee River at Peshastin, WA (USGS #12459000)

3.3.4.4 Alternate/ New Method One of the problems with the old method is that the calculations using the project data produce negative locals and odd runoff shapes. Fortunately more than 90% of side streams coming into the mid-Columbia projects are gaged. The remaining 10% is composed of the lower elevation area bordering or east of the Columbia River which receives less than 10 inches of precipitation each year and as a result experiences minimal runoff. Thus, an alternate way to determine a local flow is to utilize the data from the gaged stream tributaries to the Columbia River between each of the mid-Columbia projects. . In the old method, local flows were calculated based on observed project inflow and outflow data. In this new method, since the local flows are determined using gaged sidestream data, the outflows had to be calculated based on the new locals. Therefore, the observed inflows and outflows were considered invalid. The active storage at these mid-Columbia projects is small compared to the magnitude of the river flow. Because of this, the project outflow was chosen as the parameter that required modification. The observed change in content was accepted as being correct. The local inflow for each of the projects was assumed to be the gaged flow of the tributary streams, the change-of-content was assumed to be observed change-of-content and the project outflow was revised to be consistent with these values. The starting point of the alternate method is Chief Joseph Dam, and the ending point is Priest Rapids Dam. The observed outflow at Chief Joseph (CHJ5H) and Priest Rapids (PRD5H) are assumed correct. All the inflows and outflows of the dams between Chief Joseph and Priest Rapids are calculated based on the new method of computing locals. The new method of determining local flows, as well as the calculations to arrive at new project inflows and outflows for WY 1960-2008 are discussed next. Wells Local Flow: from 1960-1965: New WEL5L = Okanogan River near Malott (USGS #12447300) + Methow River near Pateros (USGS # 12449950) from 1965-2008: New WEL5L = Okanogan River at Malott (USGS #12447200) + Methow River near Pateros (USGS # 12449950)

Page 43

Wells Inflow and Outflow New WEL5A = (CHJ5H routed to WEL) + New WEL5L New WEL5H = New WEL5A – Observed WEL5S Rocky Reach Local Flow: from 1960-1996: New RRH5L = Entiat River near Ardenvoir (USGS #12452800) correlated to Entiat River near Entiat (USGS #12452990) The correlation was determined using overlapping data from March 1996 to September 2008 via linear regression. The regression coefficients are shown in the table below. Y = aX + b where Y = Entiat River near Entiat X = Entiat River near Ardenvoir Table 3-6. Rocky Reach Regression Coefficients

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.074 1.079 1.28 1.127 1.151 1.433 1.408 1.276 1.172 1.039 1.117 1.324b 35.79 39.21 22.29 43.55 51.86 46.10 52.62 29.28 -16.81 37.34 12.25 3.61

from 1996-2008: New RRH5L = Entiat River near Entiat (USGS #12452990) Rocky Reach Inflow and Outflow New RRH5A = (CHL5H + New WEL5H routed to RRH) + New RRH5L New RRH5H = New RRH5A – Observed RRH5S Rock Island Local Flow: from 1960-1962: New RIS5L = Wenatchee River near Peshastin (USGS #12459000) correlated to Wenatchee River at Monitor (USGS #12462500) The correlation was done using overlapping data from October 1962 to October 2010 via linear regression. The regression coefficients are shown in the table below. Y = aX + b where Y = Wenatchee River at Monitor X = Wenatchee River near Peshastin Table 3-7. Rock Island Regression Coefficients

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.026 1.094 1.104 1.102 1.134 1.153 1.078 1.126 1.096 1.044 1.041 1.072b 15.86 -22.33 -16.89 10.02 5.16 -5.16 69.78 -414.01 -380.80 -155.93 -123.24 -84.20

from 1962-2008: New RIS5L = Wenatchee River at Monitor (USGS #12462500)

Page 44

Rock Island Inflow and Outflow New RIS5A = (New RRH5H routed to RIS) + New RIS5L New RIS5H = New RIS5A – Observed RIS5S Wanapum Local Flow: Negligible Wanapum Inflow and Outflow New WAN5A = New RIS5H routed to WAN New WAN5H = New WAN5A – Observed WAN5S Priest Rapids Local Flow, Inflow and Outflow: New PRD5L = Crab Creek near Beverly (USGS #12472600) + Miscellaneous Flow (explained below) The new method of calculating mid-Columbia locals produces a slight underestimate of the total local flow between Chief Joseph and Priest Rapids. This underestimation can at least partially be attributed to the fact that not all of the drainage area runoff is gaged. As mentioned earlier, the observed outflow at Priest Rapids (PRD5H) is assumed to be correct and that is the location where inflows and outflows stop being calculated using the new method. However, calculated PRD5H values (using the new local flow method) were computed and compared against the observed PRD5H to see how different the calculated values are from the observed values. The difference was factored into the calculation of the new Priest Rapids local flows. The 49 year average (WY 1960-2008) of the calculated Priest Rapids outflow was found to be 473 cfs lower than the observed Priest Rapids outflow. To make up for this unaccounted flow, a miscellaneous flow value was calculated and added to the Priest Rapids local. The miscellaneous flow of 473 cfs was shaped to the Rock Island local flows (RIS5L) which is the nearest gaged local flow. The final Priest Rapids local flow (PRD5L) is therefore equal to the representative side stream of Crab Creek near Beverly, WA (USGS #12472600) plus the miscellaneous flow.

Page 45

3.3.5 Equations The equations used in the calculation of local flows, inflows, routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and routed flows, refer to the Routing Diagram in Appendix E. A full list of abbreviations can be found in Section 3.3.2 and in Appendix A. Data type definitions can be found in Section 1.3. As discussed in the previous section, because local flows at Wells, Rocky Reach, Rock Island, and Priest Rapids are now based on gaged sidestream data rather than calculated values, the equations usually used to calculate locals are not applicable at these locations. In this stretch of the river, local flows are observed values while the inflows into the projects are calculated based on these local flows. Because these inflows were not determined the typical way, equations that show how they were calculated are included. Locals (L): CIB = Columbia River at International Boundary. Refer to Appendix E GCL_L = GCL_A – (CIB_H routed to GCL) CHJ_L = CHJ_A – (GCL_H routed to CHJ) WEL_L = Gaged Sidestreams RRH_L = Gaged Sidestreams RIS_L = Gaged Sidestreams PRD_L = Gaged Sidestreams Inflows (A): GCL_A = GCL_H + GCL_S + FDR_P + FDR_G CHJ_A = CHJ_H + CHJ_S WEL_A = WEL_L + (CHJ_H routed to WEL) CHL_A = CHL_H + CHL_S RRH_A = RRH_L + ((WEL_H routed to RRH) + CHL_H) RIS_A = RIS_L + (RRH_H routed to RIS) PRD_A = PRD_H + PRD_S Adjusted Routed Flows (ARF): GCL_ARF = (CIB_ARF routed to GCL) + GCL_L CHJ_ARF = (GCL_ARF routed to CHJ) + CHJ_L WEL_ARF = (CHJ_ARF routed to WEL) + WEL_L RRH_ARF = (WEL_ARF routed to RRH) + RRH_L + CHL_A RIS_ARF = (RRH_ARF routed to RIS) + RIS_L WAN_ARF = RIS_ARF routed to WAN PRD_ARF = (WAN_ARF routed to PRD) + PRD_L Accumulated Depletions (DD): GCL5DD = CTR5DD + SEV5DD + UPF5DD + KET5D + FER5D + GCL5D WEL5DD = GCL5DD + OKA5D + OKM5D + (0.01) CEW5D RRH5DD = GCL5DD + OKA5D + OKM5D + (0.4) CEW5D RIS5DD = GCL5DD + OKA5D + OKM5D + CEW5D WAN5DD = RIS5DD + WRF5D*

Page 46

PRD5DD = WAN5DD + PRF5D* YAK5DD = YAK5R** – YAK5H *details in Section 4 **details in Supplemental Report included Accumulated Evaporation (EE): GCL5EE = MUC5EE + NOX5EE + GCL5E CHJ5EE = GCL5EE + CHJ5E WEL5EE = CHJ5EE + WEL5E RRH5EE = WEL5EE + RRH5E WAN5EE = RRH5EE + WAN5E PRD5EE = WAN5EE + PRD5E Modified Flows (M): GCL5M = GCL5ARF + GCL5DD + GCL5EE CHJ5M = CHJ5ARF + GCL5DD + CHJ5EE WEL5M = WEL5ARF + WEL5DD + WEL5EE CHL5M = CHL5A RRH5M = RRH5ARF + RRH5DD + RRH5EE RIS5M = RIS5ARF + RIS5DD + RRH5EE WAN5M = WAN5ARF + WAN5DD + WAN5EE PRD5M = PRD5ARF + PRD5DD + PRD5EE

Page 47

3.4 Upper and Central Snake Basins The Snake River and its tributaries drain about 72,500 square miles upstream of Brownlee Reservoir on the Idaho-Oregon border. The average amount of land irrigated above Brownlee is nearly 3.4 million acres. Surface water diversions provide an average of 14 to 16 million acre-feet of water, while groundwater supplies provide an additional 3.5 to 7.5 million acre-feet. Less than 50 percent of diverted streamflow is consumptively used; the remainder returns to the river as surface flow or recharges the groundwater aquifer. Because of this complexity, regulation studies (river basin simulations) were done by the USBR (Supplemental Report) to reflect the net effect on streamflow by successive stages of irrigation and storage development. The regulation studies adjust the flows for the 1928 to 2008 period to reflect current irrigation requirements and other reservoir operation objectives such as providing flow augmentation for salmon mitigation. The end product of the USBR regulation studies of the Snake River above Brownlee Reservoir is a regulated “modified” flow. The regulated “modified” flows above Brownlee Reservoir, denoted as BRN5R, do not remove the effect of dam storage whereas the modified flows defined in this report do. For this reason, it is not appropriate to compare modified flows generated by the USBR with modified flows generated in this 2010 level study. The area in this section includes: (1) the upper Snake Basin above King Hill (map shown in Section 3.4.1) which is a drainage area of about 36,000 square miles, encompassing parts of Idaho, Wyoming, Utah and Nevada, (2) the Central Snake Basin – King Hill to Brownlee (map shown in Section 3.4.2), which is an area of about 36,800 square miles, encompassing parts of Idaho, Nevada and Oregon.

(1) Upper Snake The Upper Snake Basin above King Hill interfaces with groundwater (the Snake Plain aquifer), surface water, and storage to serve irrigated lands. Major storage in the Upper Snake is located on the main stem, and the entire system is coordinated and operated on a forecast basis. To model diversions, other characteristics, and distinctive features, the Upper Snake is divided into six sub-areas: South Fork, Henry’s Fork, Heise-Neeley, Neeley-Milner, North Streams, and West Streams.

Irrigation practice in the subareas includes both gravity and sprinkler applications and is modeled accordingly, together with groundwater pumping. All aspects of existing operation criteria are utilized in study simulations to meet irrigation needs together with the many additional uses performed by the river system.

(2) Central Snake In the Central Snake Basin from King Hill to Brownlee, major storage reservoirs are located on the tributaries, and the Snake River serves mostly as a drainage way for the highly developed tributary streams. The Central Snake River drainage is modeled in eight sub-areas: Bruneau, Boise, Payette, Weiser, Owyhee, Malheur, Burnt, and

Page 48

Powder Rivers. Each basin is operated on a forecast basis, and coordination of the Central Snake system focuses on the diversity of basin runoff.

Between the Boise and Payette Rivers, some basin water exchanges are made. Irrigation practices – gravity, sprinkler, and groundwater pumping – are modeled accordingly. In addition to the irrigation system as modeled for surface and groundwater supplies, about 800,000 acre-feet is pumped seasonally for irrigation from the main stem of the river (Buhl, ID to Weiser, ID). This development started in about 1965, and has grown steadily to its present stature. Since direct river pumping quantities are not measured, diversions are estimated by utilizing actual generation records of the energy used to pump the water by procedures developed by the Idaho Power Company and the USBR.

Page 49

3.4.1 Regional Map 1

Figure 3-9. Upper Snake Basin Map

Page 50

3.4.2 Regional Map 2

Figure 3-10. Central Snake Basin Map

Page 51

3.5 Lower Snake Basin The area contained in this section includes the Salmon, Clearwater, Grande Ronde, and Palouse River Basins, and the main stem Snake River from Brownlee Dam to the mouth. The Salmon River drains 14,100 square miles on the east side of the Snake River. The Clearwater River drains 8,300 square miles, the Grande Ronde River drains 3,412 square miles, and the Palouse-Lower Snake collect the runoff from the remaining 10,598 square miles. See Section 3.5.1 for a map of the area. Irrigation is concentrated in the Upper Salmon, Grande Ronde, and Palouse-Lower Snake areas. Irrigation from surface water has increased from about 223,000 acres in 1928 to about 344,000 acres in 2008. In the Salmon River Basin, about 40 percent of the lands are supplied by sprinkler, the Grande Ronde Basin has about 65 percent sprinkler application and the Clearwater, Palouse–Lower Snake areas have nearly 90 percent sprinkler application. Irrigation depletion was computed based on water from surface sources. Groundwater sources were not considered because it was assumed that the groundwater and surface water are not interconnected in this basin. Below is the list of areas where depletion adjustments were computed as described in Appendix C. (1) The Upper Salmon River Basin (2) The Lower Salmon River Basin (3) The Grande Ronde River Basin (4) The Clearwater River Basin (5) The Palouse–Lower Snake River Basins Apart from the above basins, irrigation depletions in the Upper and Central Snake River basins were derived from a special study done by the USBR (Supplemental Report). The representative accumulated depletion value for those basins are applied at Brownlee dam, which is the location where the Lower Snake basin begins. Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.5.4. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D. .

Page 52

3.5.1 Regional Map

Figure 3-11. Lower Snake Basin Map

Page 53

3.5.2 List of Points Table 3-8. Lower Snake Basin Points

id name basin H S A L ARF D DD E EE M GAL Galloway Lower Snake x x BRN* Brownlee Lower Snake x x x x x x OXB Oxbox Lower Snake x HCD Hells Canyon Lower Snake x x x x x x x x WHB White Bird Lower Snake x x LIM Lime Point Lower Snake x x x TRY Troy Lower Snake x x ANA Anatone Lower Snake x x x x ORO Orofino Lower Snake x x DWR Dworshak Lower Snake x x x x x SPD Spalding Lower Snake x x x LWG Lower Granite Lower Snake x x x x x x x x x LGS Little Goose Lower Snake x x x x x x LMN Lower Monumental Lower Snake x x x x x x x x x IHR Ice Harbor Lower Snake x x x x x x UPS Upper Salmon Lower Snake x LWS Lower Salmon Lower Snake x WEN Grande Ronde Lower Snake x CLR Clearwater Lower Snake x PLS Palouse-Lower Snake Lower Snake x

x

x

x

*BRN has an additional data type, R, which is flow data provided by the USBR (Supplemental Report).

3.5.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Brownlee, ID/OR (BRN) – Regulated “modified” flows at Brownlee are provided by the USBR (Supplemental Report) and is denoted as data type BRN5R. Note that these flows are different from 5M values. Irrigation depletions are already accounted for in BRN5R, but are not available from the USBR as a separate dataset. The following calculation was used to create a BRN5DD record. BRN5DD is created because it is a component in the calculation of M values at downstream modified flow locations.

BRN5DD = BRN5R – BRN5A where BRN5A is inflows into Brownlee calculated by adding the change in storage (BRN5S) to the observed outflows at Brownlee dam (BRN5H). BRN5DD is one of the three locations where DD values should not be compared directly with the 5DD values at other sites in the Columbia River Basin because they are

Page 54

calculated differently. The other two locations with different DD calculations include YAK5DD and ROU5DD. Lime Point, ID/OR (LIM) – Lime Point is a gaging point on the Snake River downstream of Hells Canyon Dam and between the points where the Grande Ronde River and Salmon River flow into the Snake River (Appendix B). Until 2003 there was no gaging station that was representative of the flow at Lime Point so from Oct. 1999 through Sep. 2003 flow was calculated as:

Calculated LIM5H = ANA5H – (TRY5H routed to ANA) In 2003 a gage in close proximity to Lime Point was established on the Snake River: USGS Gage #13317660 "Snake River BL McDuff Rapids at China Gardens, ID". From Oct. 2003 through Sep. 2008 the gage data at McDuff was used. It was found that there is only a 1% difference between the gage data at McDuff and the calculated method so continuity issues by switching methods are negligible. Dworshak, ID (DWR) – DWR5H values are calculated rather than observed. Dworshak dam outflows are available in Dataquery [available on line at: http://www.nwd-wc.usace.army.mil/perl/dataquery.pl]. However, the flows from this database are prescribed rather than actually observed, and the hydrograph using these flows are not smooth and representative. Therefore, DWR5H was calculated as:

DWR5H = Clearwater River near Peck (USGS #13351050) – Clearwater River at Orofino (USGS #13340000)

Spalding, ID (SPD) – The local flows calculated at Spalding, ID (downstream of Dworshak Dam) had some negative values. In an attempt to smooth these negative local flows, gaged streams between DWR and SPD that may be representative of the SPD5L were investigated. Two streams were considered for indexing: (1) Lapwai Creek near Lapwai ID (USGS # 13342450) and (2) Potlatch River near Spalding (USGS # 13341570). Unfortunately, both datasets were unsuitable for representative indexing. Both records had considerable missing data. In addition, Lapwai Creek flows are very small and unrepresentative with respect to the negative local flow magnitudes. Thus, despite the mildly unrepresentative negative flows, the calculated Spalding local flows were left unchanged in this study. Lower Granite (LWG), Lower Monumental (LMN) and Ice Harbor (IHR), WA: Due to unrealistic and unreliable data reported at these sites due to a variety of reporting and hydraulic factors, the outflows from each of these dams were calculated using slightly different methods, depending on the local circumstances. Lower Granite, WA (LWG) – Inflows into Lower Granite Dam (LWG5A) are calculated as the sum of the flows from the three upstream river reaches – the Snake River, the Clearwater River and Asotin Creek:

Page 55

LWG5A = Routed[ (Clearwater River at Spalding (USGS #13352500) + Snake River at Anatone (USGS

#13335300) ] + Asotin Creek at Asotin (USGS #13335050) and

LWG5H = LWG5A – LWG5S The routed (Spalding + Anatone) value is obtained from the ResSim model. In the previous study, the USGS gage Asotin Creek, WA below Kearney Gulch (#13335700) was used instead of Asotin Creek at Asotin, WA (#13335050). However the Kearney Gulch gage was discontinued in 1996. The drainage area at Kearney Gulch was 170 square miles. The Asotin Creek at Asotin gage started reporting in 1991, has a drainage area of 323 square miles, and is located at the mouth. In comparing the two gages during the period of overlap from 1991 to 1996, the average difference was 22 cfs, with peak flow differences of about 100-200 cfs. The maximum difference was a several day event reaching 815 cfs difference in April 1996. Based on these close comparisons, the Asotin Creek at Asotin gage was deemed a suitable replacement for the Kearney Gulch gage. Lower Monumental, WA (LMN) – Because the distance between Lower Monumental and Ice Harbor dam is small, and because the local flows between them is negligible, the outflow from Lower Monumental was assumed to equal the inflows into Ice Harbor Dam.

LMN5H = IHR5A

Ice Harbor, WA (IHR) –IHR5A is correlated to LWG5A using constants from the correlation table shown in the Ice Harbor River Schematics in Appendix B. Ice Harbor flows were correlated to Lower Granite rather than any of the other dams in the lower Snake River because Lower Granite is the most upstream dam among the run-of-river dams and has reliable flow values from the Clearwater and Snake rivers as discussed earlier. The correlation table was updated for this report to include longer periods of concurrent data. IHR5H was then calculated as IHR5A minus IHR5S.

Page 56

3.5.4 Equations The equations used in the calculation of local flows, adjusted routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and routed flows, refer to the Routing Diagram in Appendix E. A full list of abbreviations can be found in Section 3.5.2 and in Appendix A. Data type definitions can be found in Section 1.3. Local Flows (L): HCD5L = HCD5A – (BRN5H routed to HCD) LIM5L = LIM5H – (HCD5H routed to LIM) – (WHB5H routed to LIM) ANA5L = ANA5H – LIM5H SPD5L = SPD5H – [(DWR5H + ORF5H) routed to SPD)] LWG5L = LWG5A – [(SPD5H + ANA5H) routed to LWG)] LMN5L = LMN5A – (LGS5H routed to LMN) Adjusted Routed Flows (ARF): HCD5ARF = (BRN5A routed to HCD) + HCD5L LIM5ARF = (HCD5ARF routed to LIM) + (WHB5H routed to LIM) + LIM5L ANA5ARF = LIM5ARF + ANA5L SPD5ARF = [(DWR5A + ORF5H) routed to SPD] + SPD5L LWG5ARF = [(SPD5ARF + ANA5ARF) routed to LWG] + LWG5L LGS5ARF = LWG5ARF routed to LGS LMN5ARF = (LGS5ARF routed to LMN) + LMN5L IHR5ARF = LMN5ARF routed to IHR Accumulated Depletions (DD): BRN5DD = BRN5R** – BRN5A ANA5DD = BRN5DD + UPS5D + LWS5D + WEN5D LWG5DD = ANA5DD + CLR5D LMN5DD = LWG5DD + PLS5D **details in Supplemental Report included Accumulated Evaporation (EE): HCD5EE = BRN5E + HCD5E LWG5EE = HCD5EE + DWR5E + LWG5E LGS5EE = LWG5EE + LGS5E LMN5EE = LGS5EE + LMN5E IHR5EE = LMN5EE + IHR5E Modified flows (M): GAL5M = GAL5H BRN5M = BRN5A + BRN5DD + BRN5E OXB5M = BRN5M HCD5M = HCD5ARF + BRN5DD + HCD5EE WHB5M = WHB5H + UPS5D + LWS5D LIM5M = LIM5ARF + UPS5D + LWS5D + BRN5DD + HCD5EE TRY5M = TRY5H + WEN5D ANA5M = ANA5ARF + ANA5DD + HCD5EE

Page 57

ORO5M = ORO5H DWR5M = DWR5A + DWR5E SPD5M = SPD5ARF + DWR5E LWG5M = LWG5ARF + LWG5DD + LWG5EE LGS5M = LGS5ARF + LWG5DD + LGS5EE LMN5M = LMN5ARF + LMN5DD + LMN5EE IHR5M = IHR5ARF + LMN5DD + IHR5EE

Page 58

3.6 Lower Columbia Basin This area includes the portion of the Closed Basin that lies in Oregon, and the portion of the Columbia River drainage that extends from the mouth of the Snake River downstream through Bonneville Dam. See Section 3.6.1 for a map of the area. The Oregon portion of the Closed Basin encompasses 17,900 square miles and includes most of Harney and Lake Counties in the south-central portion of the state. This area is not included in this study because flows do not reach the Columbia River. Irrigation from surface water in the Columbia River drainage portion of this section increased from 245,000 acres in 1928 to 551,000 acres in 2008. The larger irrigation projects are those north and south of the Columbia River that pump directly from the river and the Deschutes Project near Bend, OR. Other irrigated lands are located in the valleys of the Walla Walla, Umatilla, Willow Creek, John Day, White, Hood, Klickitat, and White Salmon Rivers. Irrigation depletion was computed based on water from surface sources. Groundwater sources were not considered because it was assumed that the groundwater and surface water are not interconnected in this basin. Below is the list of areas where depletion adjustments were computed as described in Appendix C. (1) Return flow from the Kennewick Project (2) Walla Walla River Basin (3) McNary pool direct pumping to the North Side (4) McNary pool direct pumping to the Umatilla sub-area (5) Umatilla River/Willow Creek Basins (6) John Day pool direct pumping to the North Side (7) John Day pool direct pumping to Morrow/Gilliam Counties sub-area (8) John Day River Basin (9) White River/Wapinita Project (10) Klickitat River Basin (11) White Salmon River Basin (12) Hood River Basin Apart from the above basins, special studies were done to determine the irrigation in the Upper Deschutes Basin and the Columbia Basin Project. Irrigation in the Upper Deschutes Basin, associated with the Bureau of Reclamation’s Deschutes Project, is extensive. The irrigated land has grown from 75,500 acres in 1928 to approximately 118,000 acres in 2008. Because of the use of storage reservoirs and intensive water use, a special study was conducted by USBR to determine the irrigation adjustments to be applied at Round Butte and Pelton Dams, and downstream. The output of this study was a set of 2010 level regulated inflows to Round Butte and to Pelton

Page 59

Dams. The calculated inflows into Round Butte (observed outflows plus change in storage), were subtracted from the Round Butte regulated inflows. This adjustment was then applied at-site and downstream. Additional information on this study is contained in the Supplemental Report included. The other special study in the basin is the Columbia Basin Return Flow Study (Section 4). Some of the return flows from the Columbia Basin Project (MRF5D) were applied at McNary Dam. Part of the included return flow to McNary Reservoir comes from Blocks 2 and 3 of the Columbia Basin Project, which are located south of the Snake River. Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.6.4. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D.

Page 60

3.6.1 Regional Map

Figure 3-12. Lower Columbia Basin Map

Page 61

3.6.2 List of Points Table 3-9. Lower Columbia Basin Points

id name basin H S A L ARF D DD E EE M MCN McNary Lower Columbia x x x x x x x x x JDA John Day Lower Columbia x x x x x x x x x x ROU* Round Butte Lower Columbia x x x x x x PEL Pelton Lower Columbia x x RER Pelton Rereg Lower Columbia x TDA The Dalles Lower Columbia x x x x x x x x x BON Bonneville Lower Columbia x x x x x x x B23 Pump to Blocks 2 & 3 Lower Columbia x MRF McNary Return Flow Lower Columbia x KEN Kennewick Lower Columbia x WWA Walla Walla Lower Columbia x NSM Pumping from McNary to

NorthsideLower Columbia x

NSR Return flow from McNary pumping to Northside

Lower Columbia x

UMP Pumping from McNary to Umatilla

Lower Columbia x

UMR Return flow from McNary pumping to Umatilla

Lower Columbia x

UMW Umatilla River and Willow Creek

Lower Columbia x

NSJ Pumping from John Day to Northside + Returns

Lower Columbia x

JDP Pumping from John Day to Morrow/Gilliam + Returns

Lower Columbia x

WHT White River - Wapinitia Lower Columbia x KLC Klickitat Lower Columbia x HOD Hood River Lower Columbia x WHS White Salmon Lower Columbia x

x

*ROU has an additional data type, R, which is flow data provided by the USBR (Supplemental Report)

3.6.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Pumping and Return Flow Depletions in eastern Oregon and southeast Washington (UMP, UMR, JDP, NSM, NSR, NSJ) – There are regions within subareas 32 and 36 (Appendix C) that are irrigated by water pumped from the reservoirs behind McNary and John Day Dams. Below is a list of the abbreviations used to denote the diversions pumped to these regions and the resulting return flows. Irrigation water pumped from McNary reservoir to the Umatilla basin in the south has return flows that join the river downstream of McNary Dam; water pumped from McNary Reservoir to the Northside region has return flows that join the river both upstream and downstream of the dam. Water pumped from John Day Reservoir to Morrow and Gilliam counties (OR) in the south as well as to the Northside (WA) both return to the river upstream of John Day

Page 62

Dam, thus remaining within the same reach. The figure below depicts these pumping and returns.

Figure 3-13. Schematic of Pumping and Return Flows at McNary Dam and John Day Dam McNary Reservoir: UMP5D = Pumping from McNary to Umatilla (subarea 32a(1)) UMR5D = Return flow from McNary pumping to Umatilla (subarea 32a(2)) NSM5D = Pumping from McNary to Northside (subarea 36a(1)) NSR5D = Return flow from McNary pumping to Northside (subarea 36a(2)) John Day Reservoir JDP5D = Pumping from John Day to Morrow and Gilliam counties + Returns (32b) NSJ5D = Pumping from John Day to Northside + Returns (36b) The following three components contribute towards the accumulated depletions at McNary Dam – UMP5D, NSM5D, and 0.35 NSR5D. The following four components contribute towards the accumulated depletions at John Day Dam – UMR5D, JDP5D, 0.65 NSR5D, and NSJ5D. See Section 3.6.4 for the full list of depletions that contribute towards accumulated depletions at McNary and John Day.

Page 63

Kennewick, WA (KEN) – Within subarea 36 (Appendix C) is an irrigated area near the city of Kennewick where incremental irrigation depletions are calculated differently from the procedure discussed in Appendix C, and it is as follows. The Kennewick irrigation area is supplied by diversions from the Yakima River. These diversions are accounted for in the flows at Yakima that are determined by the USBR. The return flows from the irrigated land in Kennewick get trapped behind the levees along the west side of the Columbia River. This trapped water is pumped from behind the levees into the Columbia River at multiple locations along the levees by the USACE (Walla Walla district), from whom the pumping data for 2008 was obtained. The pumping data was converted to monthly flows (cfs). Incremental depletions, or in this case the incremental return flows due to pumping in 2008, were found by calculating the difference between pumped return flows in 2008 (2010 level) and pumped return flows in the previous five modified flows studies (2000, 1990, 1980, 1970 and 1960). Incremental return flows for the years between the study years were linearly interpolated. Pumping data was not available prior to 1960 study (values equal zero), so incremental return flows from 1928 through 1959 were equal to the flows calculated from the 2008 pumping data. Below is a simplified schematic of the Kennewick irrigation area depicting the diversions, levees and return flow pumping. There are levees east of the Columbia River too, but only those pertaining to the Kennewick return flow are shown. The elements of the schematic are not to scale.

Page 64

Figure 3-14. Map of Kennewick Return Flows Map obtained from Googlemaps. Combined Depletions Points, WA (KLC) – In the previous study, the irrigation depletions in the Klickitat basin were represented by two separate area identifiers: KLC and KWS. Since both areas utilized the same climatological station for the collection of crop water requirements and were applied at the same location on the river, they were combined into one area identifier for this study – KLC. The equations in Section 3.6.4 have been updated since the last study to reflect this. The Dalles and John Day, OR/WA (TDA, JDA) – The Dalles local flows are often negative when calculated from project data, so the measured flow on the only major stream to flow into the Columbia between the two dams, the Deschutes River (USGS

Page 65

gage #14103000), is used for TDA5L. Since John Day Dam outflow is unreliable due to backwater effects from TDA, the John Day outflow was calculated as TDA5A – TDA5L. Round Butte, OR (ROU) – Regulated inflows at Round Butte Reservoir are provided by USBR (Supplemental Report) and are denoted as data type ROU5R. Note that these flows are different from 5M values. Irrigation depletions are already accounted in ROU5R, but are not available from the Bureau as a separate dataset. The following calculation was used to create a ROU5DD record:

ROU5DD = ROU5R – ROU5A

where ROU5A is the inflow into Round Butte calculated by adding the change in storage (ROU5S) to the observed outflows at Round Butte dam (ROU5H). ROU5DD is one of the three locations where DD values may not be compared directly with the 5DD values computed at other sites in the Columbia River Basin because they are calculated differently. The other two locations are YAK5DD and BRN5DD. Pelton, OR (PEL) – Outflow from springs located between Pelton and Round Butte dams resulting primarily from the extensive irrigation in the Deschutes Basin have been estimated to contribute a constant flow of 200 cfs. This estimated 200 cfs of irrigation return flow is added to the Round Butte accumulated depletions to compute the Pelton accummulated depletions. This is reflected in the equations in Section 3.6.4.

Page 66

3.6.4 Equations The equations used in the calculation of local flows, adjusted routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and routed flows, refer to the Routing Diagram in Appendix E. A full list of abbreviations can be found in Section 3.6.2 and in Appendix A. Data type definitions can be found in Section 1.3. Local Flows (L): CP_H = (PRD_H routed to Pasco) + (YAK_H routed to Pasco) + IHR_H CP = Control Point used for routing, at Pasco, Washington. Refer to Appendix E. MCN_L = MCN_A – (CP_H routed to MCN) JDA_L = JDA_A – (MCN_H routed to JDA) TDA_L = Deschutes River at Moody BON_L = BON_A – (TDA_H routed to BON) Adjusted Routed Flows (ARF): CP_ARF = IHR_ARF + (PRD_ARF routed to Pasco) + (YAK_H routed to Pasco) CP = Control Point used for routing, at Pasco, Washington. Refer to Appendix E MCN_ARF = (CP_ARF routed to MCN) + MCN_L JDA_ARF = (MCN_ARF routed to JDA) + JDA_L TDA_ARF = (JDA_ARF routed to TDA) + TDA_L BON_ARF = (TDA_ARF routed to BON) + BON_L Accumulated Depletions (DD): MCN5DD = YAK5DD + PRD5DD + MRF5D* + B235D* + LMN5DD + NSM5D + KEN5D + (0.4) NSR5D + UMP5D + WWA5D JDA5DD = MCN5DD + NSJ5D + UMW5D + UMR5D + (0.6) NSR5D + JDP5D + JDA5D ROU5DD = ROU5R** – ROU5A PEL5DD = ROU5DD + 200 CFS RETURN FLOW TDA5DD = JDA5DD + PEL5DD + WHT5D BON5DD = TDA5DD + HOD5D + WHS5D + KLC5D *details in Section 4 **details in Supplemental Report included Accumulated Evaporation (EE): MCN5EE = PRD5EE + IHR5EE + MCN5E JDA5EE = MCN5EE + JDA5E TDA5EE = JDA5EE + ROU5E + TDA5E Modified flows (M): MCN5M = MCN5ARF + MCN5DD + MCN5EE JDA5M = JDA5ARF + JDA5DD + JDA5EE ROU5M = ROU5A + ROU5DD + ROU5E PEL5M = ROU5A + PEL5DD + ROU5E RER5M = PEL5M TDA5M = TDA5ARF + TDA5DD + TDA5EE BON5M = BON5ARF + BON5DD + TDA5EE

Page 67

3.7 Willamette Basin The area covered by this section is the Willamette River Basin in Oregon. See Section 3.7.1 for a map of the area The Willamette River Basin drains 11,154 square miles. Although agriculture developed rapidly in the basin, irrigation of these lands developed slowly. About 1,000 acres were irrigated by 1910, 3,000 acres by 1920, 5,000 acres by 1930, and 27,000 acres by 1940. The period of significant increase came in the 1930s during the recovery period after the depression. During World War II, acreage under irrigation remained almost static due largely to shortages of metal for sprinkler pipe systems, which have been used almost exclusively on newly irrigated lands since the 1930s. Since World War II, the growth of irrigation has been spectacular. The total area irrigated by surface water in 1980 was 220,000 acres. A decrease in irrigation occurred during the last twenty years, resulting in a total of 172,000 surface water irrigated acres in 2008. Most of the irrigated land is located along the Willamette River from Eugene,OR to Oregon City, OR and along the lower reaches of tributary streams. Most of the irrigation (93%) in the Willamette basin is located above T. W. Sullivan Dam near Oregon City. Irrigation depletions are applied at Fern Ridge, Albany, Salem and T.W. Sullivan. Equations used to arrive at L, ARF, DD, EE and M are shown in Section 3.7.4. A schematic diagram depicting where and how the various irrigation adjustments are applied, and the data used to calculate irrigation depletions can be found in Appendix D.

Page 68

3.7.1 Regional Map

Figure 3-15. Willamette Basin Map

Page 69

3.7.2 List of Points Table 3-10. Willamette Basin Points

id name basin H S A L ARF D DD E EE M HCR Hills Creek Willamette x x x x LOP Lookout Point Willamette x x x x x x DEX Dexter Willamette x FAL Falls Creek Willamette x x x x COT Cottage Grove Willamette x x x x DOR Dorena Willamette x x x x CAR Carmen Diversion Willamette x x SMH Smith R. Reservoir Willamette x x C_S Carmen-Smith PP inflow Willamette x x TRB Trail Bridge Willamette x x x CGR Cougar Willamette x x x x BLU Blue River Willamette x x x x LEA Leaburg Willamette x x x x x WAV Walterville Willamette x x x x x FRN Fern Ridge Willamette x x x x x x ALB Albany Willamette x x x x DET Detroit Willamette x x x x BCL Big Cliff Willamette x x GPR Green Peter Willamette x x x x FOS Foster Willamette x x x x x x SLM Salem Willamette x x x x SVN T.W. Sullivan Willamette x x x x x TMY Timothy Meadows Willamette x x x x OAK Oak Grove Willamette x x NFK North Fork Willamette x x x x FAR Faraday Willamette x RML River Mill Willamette x HYD Carmen Div. Max 630 cfs Willamette x WMT Willamette Willamette x

x

x

x

xx

x

3.7.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. Prior to the current study, the Willamette basin was not routed therefore in this study routing is done from July 1928 through September 2008. Lookout Point, OR (LOP) – The outflow for LOP was defined as the outflow from Dexter Dam (DEX) and the change in storage at LOP was defined as the combined change in storage at LOP and DEX. In effect, this method treats the two projects as one combined project. Carmen Smith, OR (CAR, HYD, SMH, C_S) – A diversion tunnel and a penstock connect the McKenzie and Smith rivers at two separate locations for power generation. Water is diverted through the Carmen Diversion Tunnel from McKenzie River to Smith

Page 70

River Reservoir, and after combining with flows from the Smith River, is diverted back to the McKenzie River through the Smith Power Tunnel and penstock to the Carmen powerhouse. Flow that is diverted from McKenzie River into the Smith River comprises the CAR5H dataset. The diversion tunnel through which the water flows (HYD5A) has an upper capacity limit of 630 cfs. This diverted flow (HYD5A) along with flow in the Smith River (SMH5A) combine to create the C_S5A dataset, which then flows back into the McKenzie River through the penstock to the Carmen powerhouse. Refer to River Schematics in Appendix B for more details. Fern Ridge, OR (FRN) – Inflow is often low and due to the large surface area of the reservoir evaporation can result in negative calculated inflows. The elevation/storage table for Fern Ridge Reservoir also changed in November, 2005. The storage from October1999 to October 2005 was calculated using the old table. The storage from November 2005 to September 2008 was calculated with the new table. Modified flows (FRN5M) and inflows (FRN5A) are often negative during the summer and fall months due to high evaporation and irrigation depletion adjustments. Cougar, OR (CGR) – The elevation/storage table for Cougar Reservoir was revised in February, 2002. The storage from October, 1999 to January, 2002 was calculated with the old table. The storage from February 2002 to September 2008 was calculated with the new table. There was a big jump in storage on 1 February 2002 because of the different tables. This was corrected by finding the storage using the new table from January 2002 to September 2008. The change in storage for 1 February 2002 was noted (36 cfs). The storage for January 2002 was recalculated using the old elevation/storage table. The previous change in storage for 1 February 2002 (36 cfs) was then inserted into that date. The USACE Portland District prepared a Willamette Basin Unregulated Dataset from 1935 to 2009. From 1 October 1935 to 30 September 1947, the CENWP’s inflow into Cougar was approximately 25% higher on average than the Modified Flows dataset. A review of the two methods found that the USACE flows were more accurate. Therefore, the CENWP inflows to Cougar were used during the 1935-1947 period. Leaburg, OR (LEA) – The observed flow of USGS gage 14162500, McKenzie River near Vida, OR was adjusted to account for Gate Creek by multiplying the Vida gage data by a monthly ratio of:

LEA4H / USGS gage #14162500 for the 1966-1989 water years. The storage change at LEA was considered to be the combined storage change at Cougar Dam (CGR) and Blue River Dam (BLU). It was noticed that the flow data from USGS gage 14164900, McKenzie River above Hayden Bridge, at Springfield, OR was lower than the Vida gage. This was investigated

Page 71

by the USGS, who determined that the reach between the Vida and Hayden Bridge gages is a losing reach. Because USGS gage 14164900 was a new gage (installed in 2007) this had not been noticed or corrected until this study. Detroit, OR (DET) – Prior to October 1999, the outflow at Big Cliff Dam (BCL) was used for the DET outflow and the storage change at DET was equal to the combined storage change at DET and BCL. In effect, this method treats the two projects as one combined project. After 1999, BCL is not combined with DET. T.W. Sullivan, OR (SVN) – The derivation of the outflow from T.W. Sullivan Dam was unique because it was computed by the addition of seven different components which all contribute to flows at this location. For more details, refer to River Schematics in Appendix B.

Page 72

3.7.4 Equations The equations used in the calculation of local flows, routed flows, accumulated depletions, accumulated evaporations and modified flows are shown below. For more details on the indexing of certain local flows, and about the routing involved in determining local and routed flows, refer to the Routing Diagram in Appendix E. A full list of abbreviations can be found in Section 3.7.2 and in Appendix A. Data type definitions can be found in Section 1.3. Local Flows (L): LOP_L = LOP_A – (HCR_H routed to LOP) TRB_L = TRB_A – CAR_H LEA_L = LEA_A – [(CAR_H + TRB_H + CGR_H + BLU_H) routed to LEA] WAV_L = WAV_A – LEA_H ALB_L = ALB_H – [(LOP_H + FAL_H + COT_H + DOR_H + WAV_H + FRN_H) routed to ALB] FOS_L = FOS_A – GPR_H SLM_L = SLM_H – [(ALB_H + FOS_H + DET_H) routed to SLM] SVN_L = SVN_H – (SLM_H routed to SVN) Adjusted Routed Flows (ARF): LOP_ARF = (HCR_A routed to LOP) + LOP_L TRB_ARF = CAR_A + TRB_L LEA_ARF = [(TRB_ARF + CGR_A + BLU_A) routed to LEA] + LEA_L WAV_ARF = LEA_ARF + WAV_L ALB_ARF = [(LOP_ARF + FAL_A + COT_A + DOR_A + WAV_ARF + FRN_A) routed to ALB] + ALB_L FOS_ARF = GPR_A + FOS_L SLM_ARF = [(ALB_ARF + FOS_ARF + DET_A) routed to SLM] + SLM_L SVN_ARF = (SLM_ARF routed to SVN) + SVN_L Accumulated Depletions (DD): ALB5DD = (0.25) WMT5D SLM5DD = (0.4) WMT5D SVN5DD = (0.93) WMT5D Accumulated Evaporation (EE): SVN5EE = LOP5E + FRN5E Modified flows (M): HCR5M = HCR5A LOP5M = LOP5ARF + LOP5E DEX5M = LOP5M FAL5M = FAL5A DOR5M = DOR5A COT5M = COT5A CAR5M = CAR5H SMH5M = SMH5A C-S5M = C-S5A TRB5M = TRB5ARF CGR5M = CGR5A BLU5M = BLU5A

Page 73

LEA5M = LEA5ARF WAV5M = WAV5ARF FRN5M = FRN5A + FRN5D + FRN5E ALB5M = ALB5ARF + ALB5DD + SVN5EE DET5M = DET5A BCL5M = DET5A GPR5M = GPR5A FOS5M = FOS5ARF SLM5M = SLM5ARF + SLM5DD + SVN5EE SVN5M = SVN5ARF + SVN5DD + SVN5EE TMY5M = TMY5A OAK5M = OAK5A NFK5M = NFK5A FAR5M = NFK5A RML5M = NFK5A

Page 74

3.8 Western Washington Basin This section includes the lands in western Washington which are located west of the Cascade Range. Section 3.8.1 contains a map of this section showing those sites where streamflows were developed. Total irrigated land in 1990 amounted to 23,000 acres in the Lewis and Cowlitz River Basins and 81,000 acres located in basins draining into Puget Sound. No attempt was made to estimate the irrigated land in this study because all of the irrigated land in the various basins is located downstream from the hydropower sites.

Page 75

3.8.1 Regional Map

Figure 3-16. Western Washington Basin Map

Page 76

3.8.2 List of Points Table 3-11. Western Washington Basin Points

id name basin H S A L ARF D DD E EE M SWF Swift 1 Western Washington x x SW2 Swift 2 Western Washington x YAL Yale Western Washington x x MER Aerial (Merwin) Western Washington x x PAK Packwood Lake Western Washington x x x MOS Mossyrock Western Washington x x x x x MAY Mayfield Western Washington x x x x CS1 Cushman 1 Western Washington x x CS2 Cushman 2 Western Washington x x LAG Lagrande Western Washington x x ALD Alder Western Washington x x ROS Ross Western Washington x x DIA Diablo Western Washington x x

GOR Gorge Western Washington x x UBK Upper Baker Western Washington x x SHA Lower Baker Western Washington x x

x

x

x

3.8.3 Equations Because no routing was done for the modified flow points in this region, local flows and adjusted routed flows were not computed. Irrigation depletions and accumulated evaporations were not computed. A full list of abbreviations can be found in 3.8.2 and in Appendix A. Data type definitions can be found in Section 1.3. Modified flows (M): SWF5M = SWF5A SW25M = SWF5A YAL5M = YAL5A MER5M = MER5A PAK5M = PAK5A MOS5M = MOS5A + MOS5E MAY5M = MAY5A + MOS5E CS15M = CS15A CS25M = CS25A LAG5M = LAG5A ALD5M = LAG5M ROS5M = ROS5A + ROS5E DIA5M = DIA5A + ROS5E GOR5M = GOR5A + ROS5E UBK5M = UBK5A SHA5M = SHA5A

Page 77

3.9 Western Oregon Basin This section includes the lands along the Oregon Coast west of the Coast Range, and the Klamath River drainage extending downstream to Iron Gate, California. Section 3.9.1 shows a map of the area showing those sites where streamflows were developed. The Oregon Coast area consists of two sub-areas: the Coastal strip and the Rogue Basin. The Coastal strip supports agriculture in a narrow band no more than a few miles wide. The Rogue Basin is one of the major pear-growing regions of the nation. Apple, peach, and livestock production are also important. All of the irrigation occurs downstream from the Lost Creek Project and thus no irrigation adjustments were computed for the Lost Creek Project. The Klamath River Basin above Iron Gate, California, is located in south central Oregon and northeastern California. The Oregon portion of the basin covers about 3.6 million acres, and there are about 1.5 million acres in California. Almost all of the approximately 400,000 acres presently irrigated are supplied from surface sources with the water applied mostly by gravity. There is private irrigation development above Upper Klamath Lake, and irrigation development primarily from the USBR’s Klamath Project is downstream from Upper Klamath Lake. Irrigation development in the basin began early, and the development above Upper Klamath Lake was essentially stable from 1928 to 2008, thus no irrigation adjustment was computed for this upper portion of the basin. The Klamath Project receives water from both Upper Klamath Lake via the “A” canal, and from the Lost River. The Lost River is a closed basin and does not empty into the Klamath River. At certain times of the year, excess water is evacuated from the Lost River reservoirs for flood control purposes and dumped into the Klamath River via the Lost River Diversion Canal. During the growing season, supplemental water is supplied from the Klamath River to the Klamath Project via both the Lost River diversion canal and the Midland Canal. The southern end of the project is a sump and the pumps at Ady remove excess water and pump it back into the Klamath River. Irrigation in the Klamath Project increased until about 1950 when it essentially stabilized. PacificCorp computed and furnished incremental irrigation adjustments for the period 1928-1950. Observed streamflows since 1950 are all considered to represent a current (2010) level of irrigation development. These adjustments apply at two sites: Link River Dam and Keno gaging station. The equations used to calculate the modified flows (M) are shown in Section 3.9.3.

Page 78

3.9.1 Regional Map

Figure 3-17. Western Oregon Basin Map

Page 79

3.9.2 List of Points Table 3-12. Western Oregon Basin Points

id name basin H S A L ARF D DD E EE M LOS Lost Creek Western Oregon x x x x LNK Link R. Western Oregon x x KLA Klamath Lake Western Oregon x x JCB John C. Boyle Western Oregon x x x x ACL "A" Canal Diversion Western Oregon x x PPL "A" Canal Depletion Western Oregon x

x

3.9.3 Special Characteristics Modified flow points that are calculated differently from the methodology described in Section 2 and points that have other special characteristics are discussed in this section. “A” Canal Depletions (ACL and PPL) – The Klamath Project receives irrigation water from Upper Klamath Lake via the “A” canal, and also from the Lost River. This irrigation water data is represented by two datasets: ACL5D and PPL5D.

ACL5D = - ACL5H where ACL5H data is collected as described in the River Schematics in Appendix B. July 1928 – September 1981 = USGS October 1981 – September 2008 = USBR Klamath Falls office PPL5H data was provided by the PacificCorp, and has data only through September 1950. This is because irrigation in the Klamath Project increased until about 1950 when it essentially stabilized. PacificCorp computed and furnished incremental irrigation adjustments for the period 1928-1950.

3.9.4 Equations Because no routing was done for the modified flow points in this region, local flows and adjusted routed flows were not computed. A full list of abbreviations can be found in Section 3.9.2 and in Appendix A. Data type definitions can be found in Section 1.3. Modified flows (M): LOS5M = LOS5A LNK5M = LNK5A + ACL5D + PPL5D KLA5M = LNK5M JCB5M = JCB5A + ACL5D + PPL5D

Page 80

Section 4 Columbia Basin Project Return Flows Study

4.1 Introduction The USBR Columbia Basin Project uses water withdrawn from the Franklin D. Roosevelt Reservoir at the Grand Coulee Dam to supply irrigation water to over 671,000 acres of crops in central Washington. A pumping plant diverts water from Franklin D. Roosevelt Reservoir into Banks Lake, where it is stored for irrigation flows used by the USBR Columbia Basin Project. The irrigation water is moved throughout the USBR Columbia Basin Project through a series of canals and wasteways (Figure 4-1). Not all of the water applied to the crops is used by the plants. The excess water flows back into the wasteways or groundwater. The groundwater flow and the wasteways eventually discharge into the Columbia River. This discharge is called return flow. It is accounted for at three different reservoirs on the Columbia River: Wanapum, Priest Rapids, and McNary. Return flows consists of two main parts, (a) surface flow through wasteways and (b) groundwater flows.

4.2 Purpose of Study The purpose of this special study is to calculate the return flows at Wanapum, Priest Rapids, and McNary projects, labeled WRF5D, PRF5D and MRF5D. Typically a 5D depletion dataset incorporates both diversions and return flows, but at these three areas, the 5D values will be positive every month because they constitute return flows only. Most of the return flows at these three areas are based on irrigation water pumped from the Franklin D. Roosevelt Reservoir at Grand Coulee dam into Banks Lake. It should be noted that there is no direct correlation between the timing of when pumping occurred at Grand Coulee, when the water stored in Banks Lake is applied to the crops and when the flows are returned downstream. Record of the flows pumped from and returned to Banks Lake, are labeled as FDR5P and FDR5G. FDR5P values are positive while FDR5G values are negative. To estimate the pumping diversions at Grand Coulee, a theoretical 2010 level diversion schedule of how much net water was removed from Franklin D. Roosevelt Lake into Banks Lake was estimated by averaging the difference between the pumping data in FDR5P and the return flow generation data in FDR5G for the last three water years of this study (1928-2008). In other words, it is the last three years’ average of (FDR5P minus FDR5G). The result of this averaging is the GCL5D dataset. Most of the Columbia Basin Project is supplied with irrigation water based on the net pumping diversions at Grand Coulee, however a small portion of it is supplied by pumping downstream of the confluence of the Snake and Columbia Rivers; this pumping diversion is accounted for in the dataset B235D, as explained further in Section 4.4.2.

Page 81

Page 82

4.3 Columbia Basin Project Overview The Columbia Basin project is a multipurpose development located in the central part of the State of Washington. The project contains extensive irrigation works which extend southward from the Grand Coulee Dam across the Columbia Plateau 125 miles to the vicinity of Pasco, Washington where the Snake and Columbia Rivers join. Principal project features include Grand Coulee Dam, Franklin D. Roosevelt Lake, Grand Coulee Powerplant Complex, switchyards, and a pump-generating plant. Primary irrigation facilities are the Feeder Canal, Banks Lake, the Main, West, and East High and East Low Canals, O’Sullivan Dam, Potholes Reservoir, and Potholes Canal. There are 333 miles of main canals, 1,993 miles of laterals, and 3,498 miles of drains and wasteways on the project.All of the principal features have been constructed, except the East High Canal and the extension of the East Low Canal, on which construction has been deferred. Figure 4-1 below shows a map of the Columbia Basin Project. Throughout this report, references are made to various ‘blocks’ within the Project area, and can be located in the map. Blocks are delineations of irrigated areas.

Figure 4-1. Columbia Basin Project (USBR 1984)

Page 83

The widely distributed irrigation works that extend southward from the Grand Coulee Pump-Generating Plant begin with the short feeder canal which carries water to Banks Lake, the equalizing reservoir. This 27-mile–long reservoir occupies the floor of the upper Grand Coulee between North Dam near the town of Coulee Dam, Washington, and Dry Falls Dam into the northern end of the irrigable area. The West, East High, and East Low Canals are fed by the Main Canal and carry water over a large portion of the project area. O’Sullivan Dam, in the central part of the project, created the Potholes Reservoir where return flows from the northern part of the project area are recaptured. The Potholes Canal extends into and serves the southern part of the project area. Main Canal The main Canal begins at the headworks of Dry Falls Dam and consists of unlined and concrete-lined sections. Total length of the canal, including siphons, tunnels, and Billy Clapp Lake, is 18.4 miles. The first 1.8 miles from Dry Falls Dam to the Bacon Siphon and Tunnel structures has been increased in capacity from 13,200 to 19,300 cfs. Bacon Siphon and Tunnel structures consist of two siphons, each about 1000 feet long, and two tunnels, each about 2 miles long, that carry the water to Billy Clapp Lake. This lake, some 6 miles long and formed by the construction of the earthfill Pinto Dam is a segment of the canal system. Construction of an equal length very difficult and expensive canal was thus avoided. West Canal The West Canal has an initial capacity of 5,100 cubic feet per second and a length of 82.2 miles. It is one of two canals formed by the bifurcation of the Main Canal. The West Canal skirts the northwest periphery of the project and en-route is carried across the lower Grand Coulee end of Soap Lake. The canal continues around the upper margin of Quincy Basin to the northern base of Frenchman hills, which it penetrates by a 9,000-foot tunnel, ending in an easterly branch across the Royal Slope. The capacity of the canal is reduced progressively as water is diverted into lateral distribution systems built to serve the entire northwestern portion of the project. East Low Canal The East Low Canal, having an initial capacity of 4,500 cubic feet per second, also begins at the bifurcation of the Main Canal. The East Low Canal extends southerly in a contour course through the rolling eastern uplands, passes through or near the towns of Moses Lake and Warden, and terminates just east of the Scooteney Reservoir. An extension of the canal, on which construction has been deferred, would carry water southward and to the east of the towns of Connell, Mesa, and Eltopia. O’Sullivan Dam O’Sullivan Dam, one of the larger zoned earth fill dams in the United States, is on Crab Creek about 15 miles south of Moses Lake. The 27,900 acre Potholes Reservoir formed by the dam collects return flows from all irrigation in the upper portion of the project for reuse in the southern portion. Active storage capacity of the reservoir is 332,200 acre-feet. A system of wasteways has been built on both the West and East Low Canals to

Page 84

provide additional safety for the canals and a means of delivering water into Potholes Reservoir to supplement the natural and return flows. Potholes Canal The Potholes Canal has a capacity of 3,900 cubic feet per second, begins at the headworks of O’Sullivan Dam, and extends 62.4 miles in a southerly direction to irrigate lands that eventually will total about 234,000 acres (at present 203,678 acres are being served) in the southwestern and south-central portions of the project. Irrigation Blocks 2 and 3, about 5,000 acres (at present 3460 acres) located in the southernmost tip of the South District, receive irrigation water pumped directly from the rivers: Block 2 from the Snake River and Block 3 from the Columbia River. East High Canal This proposed 88-mile long canal, designed for an initial capacity of about 7,500 cubic feet per second, will divert water from the Main Canal immediately above Summer Falls and Billy Clapp Lake, and will serve lands east of the East Low Canal extending from the northernmost point of the project area south to Washtucna Coulee. Relift Pumping Plants About 360,000 acres of the irrigable lands within the project are located at elevations higher than the gravity canals and laterals. Some of these high lands are now being served by re-lift pumping plants at various points within the projects

4.4 Return Flow – General Return flow is calculated as two components – surface water return via wasteways, and direct groundwater return. Surface water return flow in the wasteways consist of operational wastes and farm run-off, as well as some groundwater that seeps into the wasteways. Direct ground water return is returned directly into the Columbia River from the western most blocks of the Columbia Basin Project. These western most blocks are adjacent to the river. Both surface and groundwater returns vary on a monthly basis. The monthly percentage distributions of the surface and groundwater return flow components are different. Surface water return flow has no lag time, but groundwater return flow is lagged; the percentage distribution used for the groundwater component was taken from Mundorff (1952), and is shown in Table 4-2.

4.4.1 Return flow from lands irrigated by Banks Lake The Columbia Basin Project was divided into three return flow units or areas. They are: (1) Potholes Unit, (2) Crab Creek Unit, and (3) South Unit. These return flow unit boundaries do not coincide with irrigation district boundaries. Certain blocks in the East and Quincy Irrigation districts, for instance, have return flow which drains into Potholes Reservoir and are part of the Potholes Return Flow Unit.

(1) Potholes Unit

Potholes Unit is the area between Banks Lake and Potholes Reservoir, and is made of up irrigation land north of Blocks 79, 78, 44 and 43. Most of the return flow from the blocks within the Potholes Unit flows to the Potholes Reservoir and does not result

Page 85

directly in return flow to the Columbia River. If at all any of the irrigation blocks contribute return flow to the Columbia River, they would be from the western portion of the blocks – Blocks 74, 77 and 79 – and this flow was estimated to be less than 5 cfs and hence considered negligible. Therefore, for the purposes of this study, Potholes Unit does not contribute return flow to the Columbia River. (2) Lower Crab Creek Unit

Lower Crab Creek Unit is the area south of Potholes Reservoir, and north of Lower Crab Creek and Saddle Mountains, and is made up of Blocks 80, 81, 82, 83, 85, 86, 87, 88, and part of 49. Return flow from this unit enters the Columbia River at two locations – Wanapum Reservoir and Priest Rapids Reservoir. The return flow to Wanapum Reservoir is the sum of the surface water flow from three different wasteways, and direct groundwater flow from some western blocks of the unit, Blocks 82, 81 (part) and 83 (part). These return flows get applied at Wanapum as WRF5D. The remainder of the return flow from the Lower Crab Creek Unit enters Crab Creek. The flows in Crab Creek account for water from two sources: (1) seepage through O’Sullivan Dam foundation on Potholes Reservoir and (2) spill from Potholes Reservoir and groundwater migration from irrigated lands east of the Potholes Canal. During the pre-project period (prior to 1948), the Potholes Reservoir area contained an area of springs; and Crab Creek in its lower reaches had little flow in comparison to 1990 conditions. For instance, during water year 1948, the USGS gage “Crab Creek near Smyrna” had a monthly mean flow of only 18 cfs in February and 26 cfs in September. These flows represent the high and low monthly means for that water year. The recorded flows of “Crab Creek near Beverly” (just downstream of Smyrna) for water year 2008 show a low monthly mean of 160 cfs in March and a high of 318 cfs in October. This is a substantial increase in the discharge of Crab Creek since irrigation was initiated The return flow to Priest Rapids reservoir is the surface water flow from Crab Creek (USGS Gage 12472600 – Crab Creek near Beverly) and two other wasteways, plus the direct groundwater flow from Block 26 (part). These return flows get applied at Priest Rapids as PRF5D. (3) South Unit

South Unit is the area south of Lower Crab Creek Unit all the way to the Snake River, including a couple of blocks south of the Snake River. Return flow from this unit is applied at McNary Reservoir. The return flow here is surface water flows from seven different wasteways, one drain and one diversion channel, plus direct groundwater return flow from the western blocks 25, 26, 251 and 253. These return flows are applied at McNary and constitute not all, but part of MRF5D. The components that make up the rest of MRF5D are explained in the next section.

Page 86

4.4.2 Return flow from other sources Below is a list of return flow from other sources which lie within the South Unit. The return flows from all sources listed below join the Columbia River at McNary Reservoir and contribute toward MRF5D.

(a) Block 1 (b) Blocks 2 and 3 (c) Springs at Ringold (d) Pumping west of Pasco

Apart from irrigation water from Banks Lake, there are certain areas within the Columbia Basin Project that receive irrigation diversions from other sources. Blocks 1, 2 and 3 in the South Unit receive irrigation diversions via pumping from Snake and Columbia Rivers.

(a) Block 1 Block 1 is located north-west of the Snake and Columbia River confluence and west of Pasco. In 1948, the water supply to Block 1 was provided by pumping from the Columbia River. Following the construction of Potholes Canal, pumping was discontinued, and the canal provided the necessary water. The return flow from Block 1 enters McNary reservoir, and consists of both surface and ground water returns. (b) Blocks 2 and 3 Blocks 2 and 3 are located south-east of the Snake and Columbia River confluence, and water is supplied to them via pumping from the Columbia and Snake rivers. The return flow from Blocks 2 and 3 enters McNary reservoir, and consists of both surface and ground water returns. It should be noted that the pumping diversions from the Columbia and Snake rivers for irrigating Blocks 2 and 3, are accounted for in a separate dataset called B235D. The pumping data is provided by the USBR. Along with MRF5D, B235D is added towards the calculation of the accumulated depletions at McNary dam, MCN5DD.

Apart from return flows from irrigated lands, two other sources of return flows include the Springs at Ringold, WA, and pumping west of Pasco, WA.

(c) Springs at Ringold, WA The Columbia River from Coyote Rapids (5.5 miles downstream from the Vernita State Highway 24 Bridge at RM 382.6) to the Esquatzel Diversion Canal has cut into the Ringold Formation, which is essentially impermeable. The springs at Ringold emerge from a gravel-filled hanging valley cut into the Ringold Formation and are return flow exclusively. The 2000 Level Modified Flow Study used 25 cfs per month as the return flow from the springs at Ringold. Because this is an impermeable formation, it is unlikely that the return flow has changed much since the 2000 level study. Therefore, 25 cfs per month is used in this study as well.

Page 87

(d) Pumping west of Pasco, WA The USACE has constructed flood protection levees west of Pasco, WA. Return flow to the Columbia River West of Pasco collects behind the levees at Pasco and is pumped into McNary Reservoir by USACE. Pumping data was provided by the USACE.

4.5 Return Flow – Details Return Flows = (a) Surface water Return Flows + (b) Groundwater Return Flows

(a) Surface water Return Flow USBR provided the 2008 monthly volume of water flowing into the Columbia River via wasteways at Wanapum, Priest Rapids and McNary. At McNary there are two additional sources of surface water return flow: pumping from behind levees, and flow from springs.

(b) Groundwater Return Flow The return flows from groundwater are calculated as:

Groundwater Return Flow Volume (ac-ft) = Groundwater Return Flow Rate (ac-ft/ac) * Irrigated Acres (ac) * Monthly Return Flow Distribution(%)

Groundwater Return Flow Rate The water available for return flows is the total water that has been diverted for irrigation (diversions), minus the water used by the crops and lost to evaporation (depletions). Diversions minus depletions equal surface runoff, plus canal operational waste plus the groundwater return flow. Diversions are the sum of the farm delivery plus the canal operational waste plus the canal losses. This can be shown with the equations below:

Available Return Flow = Div – Dep = S + W +G (Equation 1)

Div = FD + W + L (Equation 2) where, Div = Diversions Dep = Depletions S = Surface Runoff W = Canal Operational Waste G = Groundwater Return Flow FD = Farm Delivery L = Canal Losses The USBR calculates the volumes of water for the variables listed above except for groundwater return flow. To calculate the volume of groundwater return flow, Equation 2 is substituted into Equation 1:

(FD + W + L) – Dep = S + W + G.

Page 88

Rearranging and simplifying this equation produces:

G = FD + L – Dep – S. Data provided by the USBR 2007 Monthly Water Distribution report was put into the above equation to yield groundwater return flow rates of 2.23 ac ft/ac into Wanapum Reservoir, 1.58 ac ft/ac into Priest Rapid Reservoir, and 2.14 ac ft/ac into McNary Reservoir (Table 4-1). Table 4-1. Groundwater Return Flow and Variables

Farm

Delivery1

(FD)

Canal Loss1

(L)Depletion2

(Dep)

Surface

Runoff3 (S)

Groundwater Return Flow

Rate(ac ft/ac) (ac ft/ac) (ac ft/ac) (ac ft/ac) (ac ft/ac)

Wanapum 3.74 1.51 2.3 0.72 2.23Priest Rapid 3.85 0.75 2.3 0.72 1.58McNary 3.67 1.49 2.3 0.72 2.14

Return Flow Reservoir

1From USBR 2007. 2From CRWMG, 1988 3From CRWMG, 1988 Irrigated Acres This is the acreage of the irrigation blocks that contribute groundwater flow directly into the Columbia River, and are mostly located on the western edge of the Columbia Basin Project boundary, close to the Columbia River. Monthly Return Flow Distribution There is a lag from the time the water is applied to the crops to the time it returns to the Columbia River. Mundorff (1952) studied the return flows, including the groundwater component, in the Columbia Basin Project in the early 1950s. The report accounts for the lag time of the groundwater return flow distributed as a percentage by month, as shown in Table 4-2: Table 4-2. Groundwater Return Flow Distribution

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

Distribution (%) 8.5 7.5 6.7 6.2 5.8 6.2 7.7 9.7 10.7 10.8 10.5 9.7 100 To calculate the return flow volume from groundwater, the total irrigated acres contributing return flow to a reservoir are multiplied by the groundwater return flow rate, which in turn is multiplied by the monthly percent distribution shown in Table 4-2.

4.5.1 Return flows to Wanapum Reservoir (WRF5D) Wanapum is the upstream most location where return flows from the Columbia Basin project gets applied. WRF5D gets included into the calculation of the accumulated depletions at Wanapum, WAN5DD.

Page 89

(a) Surface water Return Flow - Wasteways The USBR provided 2008 measured flows in the following wasteways (Figure 4-2, Table 4-3):

W61CWW Sand Hollow RB5J1WW

Figure 4-2. Discharge Locations of Wasteways with Return Flow to Wanapum Reservoir Map from Google Maps. Table 4-3. Wasteway Return Flows to Wanapum Reservoir

Measured Surface Water Return Flows Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

W61CWW 0 0 67 107 117 125 63 109 141 177 0 0 906Sand Hollow 0 0 268 1,224 1,615 1,051 1029 1,698 1,817 1,398 0 0 10,100RB5J1WW 0 0 32 109 103 81 53 185 194 131 0 0 888

Total (ac-ft) 0 0 367 1,440 1,835 1,257 1,145 1,992 2,152 1,706 0 0 11,894Total (cfs) 0 0 6 24 30 21 19 32 36 28 0 0

Page 90

(b) Groundwater Return Flow-Blocks 82 & 83 All of the groundwater return flows from Block 82, 75% of Block 81, and 25% of Block 83 enter Wanapum Reservoir. The USBR reported that in 2008, Block 81 had 13,109 irrigated acres, Block 82 had 8,996 irrigated acres, and Block 83 had 6,619 irrigated acres. When each block’s irrigated acreage is multiplied by the block’s contributing percentage to Wanapum Reservoir, it is found that a total of 20,483 irrigated acres contribute groundwater return flow to Wanapum Reservoir. This acreage multiplied by the return flow rate of 2.23 acre feet/acre gives a total of 45,676 acre feet of water that will become groundwater return flow. This total is multiplied by the percentages shown in Table 4-2 to give the monthly distribution of the groundwater return volume, which is then converted to cfs (shown in Table 4-4). (c) Total Return Flow The return flows from the wasteways in Table 4-3 are shown again in Table 4-4 and added to the groundwater return flow estimates to produce a total monthly return flow volume shown in cfs below. To create the return flow dataset at Wanapum (WRF5D), incremental return flows were determined by taking the values from the bottom row of Table 4-4 and deducting the return flows from each year (1928- 2008). From 1928 through 1948, there were no return flows because the Columbia Basin project was not yet in place, so the incremental return flows were simply the values as shown in Table 4-4. From 1948 through 2008, the incremental return flows were interpolated between 10 year increments of calculated data such that the increment in 2008 was zero. WRF5D contributes toward the accumulated depletions (WAN5DD) at Wanapum Dam. Table 4-4. Total Return Flows to Wanapum Reservoir

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Groundwater Return(cfs) 63 60 50 48 43 48 57 72 82 80 81 72Wasteway Flows (cfs) 0 0 6 24 30 21 19 32 36 28 0 0

Total Return Flow (cfs) 63 60 56 72 73 69 76 104 118 108 81 72

4.5.2 Return flows to Priest Rapids Reservoir (PRF5D) Priest Rapids is the second location downstream where return flows from the Columbia Basin project are applied. PRF5D gets included into the calculation of the accumulated depletions at Priest Rapids, PRD5DD. (a) Surface water Return Flow - Wasteways To determine the return flow into Priest Rapids Reservoir via the wasteways, the USBR provided measured water flows for 2008 in the following wasteways (Figure 4-3, Table 4-5)

Crab Creek at Beverly (USGS Gage # 12472600) Priest Rapids Wasteways WB48 E&D Wasteways

Page 91

Figure 4-3. Discharge Locations of Wasteways with Return Flow to Priest Rapids Reservoir Map from Google Maps Table 4-5. Wasteway Return Flows to Priest Rapids Reservoir

Measured Surface Water Return Flows Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

Crab Creek @ Beverly 9930 11420 9810 12620 12720 8980 7530 11920 16160 17200 11460 9860 139,610Priest Rapids WW 0 0 3,525 4,856 3,362 2,918 4090 2,507 3,463 3,473 0 0 28,194WB48E&DWW 0 0 140 162 108 116 121 133 135 112 0 0 1,027

Total (ac-ft) 9,930 11,420 13,475 17,638 16,190 12,014 11,741 14,560 19,758 20,785 11,460 9,860 168,831Total (cfs) 161 199 219 296 263 202 191 237 332 338 193 160 (b) Groundwater Return Flow – Block 26 Approximately 75% of the groundwater return flow from Block 26 enters Priest Rapids Reservoir. The USBR reported that in 2008, Block 26 had 11,550 irrigated acres; therefore, groundwater return flow from approximately 8,663 acres will enter Priest Rapids Reservoir. This is multiplied by the 1.58 acre feet/acre producing an estimated 13,687 acre feet of groundwater return flow entering Priest Rapids Reservoir. This total is multiplied by the percentages shown in Table 4-2 to give the monthly distribution of the groundwater return volume, which is then converted to cfs (shown in Table 4-6).

Page 92

(c) Total Return Flow The return flows from the wasteways in Table 4-5 are added to the groundwater return flows to produce total monthly return flow volume estimates in cfs. To create the return flow dataset at Priest Rapids (PRF5D), incremental return flows were determined by taking the values from the bottom row of Table 4-6 and deducting the return flows from each year (1928- 2008). From 1928 through 1948, there were no return flows because the Columbia Basin project was not yet in place, so the incremental return flow would just be the values as shown in Table 4-6. From 1948 – 2008, the incremental return flows were interpolated between every 10 years of calculated data such that the increment in 2008 was zero. PRF5D contributes towards the accumulated depletions (PRF5DD) at Priest Rapids Dam. Table 4-6. Total Return Flows to Priest Rapids Reservoir

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Groundwater Return (cfs) 19 18 15 14 13 14 17 22 25 24 24 22Wasteway Flows (cfs) 161 199 219 296 263 202 191 237 332 338 193 160

Total Return Flow (cfs) 180 216 234 311 276 216 208 258 357 362 217 182

4.5.3 Return flows to McNary Reservoir (MRF5D) McNary is the last location downstream where return flows from the USBR Columbia Basin Project are accounted for. MRF5D gets included into the calculation of the accumulated depletions at McNary, MCN5DD.Return flows to McNary Reservoir are made up of (a) surface water return flows from wasteways, pumping from behind levees, and flow from springs, (b) groundwater return flow from Blocks 25, 26, 251, & 253, and (C) surface and ground water return flows from Blocks 1, 2 & 3. (a) Surface water Return Flow – Wasteways, Pumping & Springs In addition to the wasteways, additional sources of surface water return flows at McNary are pumping from behind levees west of Pasco, and flow from springs at Ringold. Wasteways To determine the return flow into McNary Reservoir via the wasteways, the USBR provided measured water flows for 2008 in the following wasteways (Figure 4-4, Table 4-7):

Mattawa Drain WB10 Wasteways 1 WB5 Wasteways 1 Pasco Wasteways PE16.4 Wasteways Esquatzel Diversion Channel PP4.3 Wasteways BP2 Wasteways BP3 Wasteways

Page 93

Figure 4-4. Discharge Locations of Wasteways with Return Flow to McNary Reservoir Map from Google Maps Table 4-7. Wasteway Return Flows to McNary Reservoir

Measured Surface Water Return Flows Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

Mattawa Drain (ac-ft) 0 0 495 742 605 661 685 669 714 601 0 0 5,172WB10WW1 (ac-ft) 908 1,109 1,033 1,553 1,498 1,343 724 1,119 1,537 1,837 1,150 885 14,696WB5WW1 (ac-ft) 676 619 1,172 3,384 3,933 3,388 3,729 3,535 3,662 3,297 746 615 28,756PascoWW (ac-ft) 317 173 2,535 2,216 1,400 1,644 1,984 2,448 1,954 3,529 3,477 179 21,856PE16.4WW (ac-ft) 3,989 3,679 4,905 10,050 10,257 10,167 11,304 12,508 14,184 12,893 7,127 4,967 106,030EsquatzelWW (ac-ft) 3,745 3,424 4,380 5,092 6,274 6,748 6,845 4,005 4,265 4,298 2,648 1,978 53,702PP4.3WW (ac-ft) 0 0 222 476 480 476 492 492 476 413 0 0 3,527BP2WW (ac-ft) 0 0 26 60 61 60 61 61 60 52 0 0 441BP3WW (ac-ft) 0 0 26 60 62 60 61 61 60 52 0 0 442

Total (ac-ft) 9,635 9,004 14,794 23,633 24,570 24,547 25,885 24,898 26,912 26,972 15,148 8,624 234,622Total (cfs) 157 157 241 397 400 413 421 405 452 439 255 140 Pumping from behind levees The USACE Walla Walla District has constructed flood protection levees west of Pasco, WA. The return flows west of Pasco collect behind these levees which the Corps then pumps into the reservoir behind McNary Dam. The USACE provided the 2008 pumping records (Table 4-8).

Page 94

Table 4-8. Returns From Pumping West of Pasco, Washington Pump Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Average

12-1A (ac-ft) 1998 1550 2450 2494 1720 2217 2265 2146 2136 1959 1879 2032 2484612-1 (ac-ft) 1998 1797 2450 2494 1720 2230 2265 2146 2136 1959 1879 2032 2510812-2 (ac-ft) 527 530 565 586 638 724 758 675 627 607 611 588 7435

Total (ac-ft) 4523 3877 5466 5574 4078 5171 5288 4968 4899 4524 4370 4651 57389Total (cfs) 74 67 89 94 66 87 86 81 82 74 73 76 79

Flow from springs The Columbia River from Coyote Rapids (5.5 miles downstream from the Vernita State Highway 24 Bridge at RM 382.6) to the Esquatzel Diversion Canal has cut into the Ringold Formation, which is essentially impermeable. The springs at Ringold emerge from a gravel-filled hanging valley cut into the Ringold Formation and are return flow exclusively. The 2000 Level Modified Flow Study used 25 cfs per month as the return flow from the springs at Ringold. Because this is an impermeable formation, it is unlikely that the return flow has changed much since the 2000 level study. Therefore, 25 cfs per month is used in this study. (b) Groundwater Return Flow – Blocks 25, 26, 251, & 253 All of the groundwater return flows from Blocks 25, 251, 253, and 25% of Block 26 enter McNary Reservoir. USBR reported that in 2008 Block 25 had 11,028 irrigated acres, Block 251 had 8,240 irrigated acres, Block 253 had 11,394 irrigated acres, and Block 26 had 11,550 irrigated acres. When each block’s irrigated acreage is multiplied by the block’s contributing percentage to McNary Reservoir, it is found that a total of 33,550 irrigated acres contribute groundwater return flow to McNary Reservoir. This acreage multiplied by the 2.14 acre feet/acre gives a total of 71,796 acre feet of water that will become groundwater return flow. This total is multiplied by the percentages shown in Table 4-2 to give the monthly distribution of the groundwater return volume, which is then converted to cfs (shown in Table 4-14). (c) Surface and Ground water Return Flows from Blocks 1, 2 & 3 The USBR reported in the 2007 Monthly Water Distribution that 3,460 acres were irrigated in 2007 for Blocks 2 and 3 (shown in Table 4-9).Block 1 return flows are discussed after Blocks 2 and 3. Blocks 2 and 3 The return flow for Blocks 2 and 3 is made up of two surface water return flow components - surface runoff from irrigation and lateral runoff – and a groundwater return flow component.

Page 95

Table 4-9. Diversions to Blocks 2 and 3 (ac-ft)

Month

Total Diversion (Div)

Lateral Losses (LL)

Lateral Waste (LW)

Non-Irrigation Deliveries (Nid)

Farm Delivery (FD) = Div – LL – LW - Nid

Monthly Distribution

JAN 0 0 0 0 0 0%FEB 0 0 0 0 0 0%MAR 770 250 90 20 410 3%APR 2,240 490 210 190 1,350 10%MAY 3,350 430 220 250 2,450 15%JUN 3,680 510 210 360 2,600 16%JUL 4,640 580 220 390 3,450 20%AUG 4,090 610 220 360 2,900 18%SEP 2,740 430 210 300 1,800 12%OCT 1,560 260 160 200 940 7%NOV 0 0 0 0 0 0%DEC 0 0 0 0 0 0%

TOTAL (ac-ft) 23,070 3,560 1,540 2,070 15,900 100%ac-ft/acre 6.67 1.03 0.45 0.6 4.6

The total return flow rate from Blocks 2 and 3 is calculated by taking the total diversion and subtracting the lateral losses, lateral wastes, and non-irrigation deliveries, all in ac-ft per acre. The remainder after the subtractions is the farm delivery requirement. It is estimated that the crop consumptive use is 2.25 ac-ft/acre, which is subtracted from the farm delivery requirement. This gives a total return flow rate of 2.35 ac-ft/acre. In other words:

Total return flow rate = (Div – LL – LW – Nid) – Crop consumptive use Approximately 80 percent of the total return flow rate, 1.88 ac-ft/acre, is estimated to be the ground water return flow rate, while the remaining 20 percent, 0.47 ac-ft/acre, is the return flow rate of one of the two components of the surface water return flow – the component from surface runoff. The second surface water runoff rate is from lateral waste, which from Table 4-9 is 0.45 ac-ft/acre. The values discussed in this section are shown in tabular form in Table 4-10. Table 4-10. Blocks 2 and 3 Return Flow Rates

ac-ft/acTotal Diversion (Div) (Table 4-9) 6.67Lateral Losses (LL) (Table 4-9) -1.03Measured Lateral Wastes (LW) (Table 4-9) -0.45Non-Irrigation Deliveries (Nid) (Table 4-9) -0.60Farm Delivery Requirement (FD) (Table 4-9) Subtotal = 4.60Consumptive Use (estimate from 2000 Level study) -2.25Total Return Flow rate Total = 2.35Groundwater Return Flow Rate 80% of total = 1.88Surface water Return Flow Rate : 1st Component - Surface Runoff from IrrigationSurface water Return Flow Rate : 2nd Component - Measured Lateral Waste (LW) (Table 4-9)

from Table 4-9 (LW)

0.45

20% ot total = 0.47

Page 96

The total acreage of Blocks 2 and 3 (3460 acres) was multiplied by each of the three return flow rates to get the total annual volume, which was then distributed across the months according to distribution percentages. The groundwater return is distributed using percentages from Table 4-2 (shown again in Table 4-11), while the two surface water returns were distributed using separate percentages shown in Table 4-11 below. These surface water percentages were obtained from the West and East canals runoff data provided by USBR. Table 4-11. Blocks 2 and 3 Return Flow

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

Groundwater Return Distribution (%) 8.5% 7.5% 6.7% 6.2% 5.8% 6.2% 7.7% 9.7% 10.7% 10.8% 10.5% 9.7% 100.0%Groundwater Return (ac-ft) 553 488 436 403 377 403 501 631 696 703 683 631 6505

Surface water Return Distribution 1 (%) 0.0% 0.0% 1.4% 13.1% 16.3% 16.8% 17.0% 12.9% 13.3% 9.2% 0.0% 0.0% 100.0%Surface water Return 1 (ac-ft) 0 0 22 214 265 273 276 211 217 149 0 0 1626

Surface water Return Distribution 2 (%) 0.0% 0.0% 1.5% 14.1% 14.9% 13.8% 12.5% 16.4% 15.0% 11.9% 0.0% 0.0% 100.0%Surface water Return 2 (ac-ft) 0 0 23 220 231 214 195 255 233 185 0 0 1557

Total Mean Monthly Return (ac-ft) 553 488 482 837 874 891 972 1097 1145 1036 683 631 9688Total Mean Monthly Return (cfs) 9.0 8.8 7.8 14.1 14.2 15.0 15.8 17.8 19.2 16.9 11.5 10.3

Groundwater Return: Total Volume = 3460 acres * 1.88 ac-ft/acre = 6505 ac-ft

Surface water Return 1 - Surface Runoff: Total Volume = 3460 acres * 0.47 ac-ft/acre = 1626 ac-ft

Surface water Return 2 - Lateral Waste: Total Volume = 3460 acres * 0.45 ac-ft/acre = 1557 ac-ft

Total Return to McNary Reservoir

Block 1 The methodology used to calculate the total return flow from Block 1 to McNary is the same as that used at Blocks 2 and 3. The return flow rates used in Block 1 are as follows: In the 2000 Level Modified Flow Study the return flow from Block 1 was calculated based on the irrigated acreage provided by USBR. This data was unavailable for this study, so Block 1 irrigated acreage was estimated using Blocks 2 and 3 data. In Blocks 2 and 3 the amount of irrigated acres increased 3.65% between 2000 and 2007. Assuming that Block 1 had a similar percent increase in irrigation, the 3.65% increase was applied to the 2000 Level Block 1 acreage to give a new acreage of 6077 acres. Using Google Earth, a visual estimate yielded an approximate irrigation acreage of 6095 acres, which is in the vicinity of the 6077 value. This was considered a reasonable validation of the initial calculation of Block 1 irrigated acreage. Monthly percentage distributions of the various return flows are the same as for Blocks 2 and 3. The return flow rates used in Block 1, were obtained from the USBR, and are as are follows: Table 4-12. Block 1 Return Flow Rate

Groundwater Return Flow Rate 2.1

Surface water Return Flow Rate: 1st Component – Surface Runoff from Irrigation 0.4

Surface water Return Flow Rate: 2nd Component – Measured Lateral Waste (LW) (from Table 9) 0.3

Page 97

Table 4-13. Block 1 Return Flow Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total

Groundwater Return Distribution (%) 8.5% 7.5% 6.7% 6.2% 5.8% 6.2% 7.7% 9.7% 10.7% 10.8% 10.5% 9.7% 100.0%Groundwater Return (ac-ft) 1085 957 855 791 740 791 983 1238 1366 1378 1340 1238 12762

Surface water Return Distribution 1 (%) 0.0% 0.0% 1.4% 13.1% 16.3% 16.8% 17.0% 12.9% 13.3% 9.2% 0.0% 0.0% 100.0%Surface water Return 1 (ac-ft) 0 0 33 319 396 408 412 315 324 223 0 0 2431

Surface water Return Distribution 2 (%) 0.0% 0.0% 1.5% 14.1% 14.9% 13.8% 12.5% 16.4% 15.0% 11.9% 0.0% 0.0% 100.0%Surface water Return 2 (ac-ft) 0 0 27 257 271 251 229 299 273 216 0 0 1823

Total Mean Monthly Return (ac-ft) 1085 957 916 1368 1408 1450 1623 1851 1962 1818 1340 1238 17016Total Mean Monthly Return (cfs) 9.0 8.8 7.8 14.1 14.2 15.0 15.8 17.8 19.2 16.9 11.5 10.3

Groundwater Return: Total Volume = 6077 acres * 2.1 ac-ft/acre = 12762 ac-ft

Surface water Return 1 - Surface Runoff: Total Volume = 6077 acres * 0.4 ac-ft/acre = 2431 ac-ft

Surface water Return 2 - Lateral Waste: Total Volume = 6077 acres * 0.3 ac-ft/acre = 1823 ac-ft

Total Return to McNary Reservoir

(d) Total Return Flow The return flows from the wasteways shown in Table 4-7, the pumping west of Pasco shown in Table 4-8, the return flow from the springs at Ringold (constant value of 25 cfS), the return flows from Block 2 and 3 shown in Table 4-11 and the return flow from Block 1 shown in Table 4-13 are added to the groundwater return flows to produce the total monthly return flow volume into McNary Reservoir (shown in Table 4-14). To create the return flow dataset at McNary (MRF5D), incremental return flows were determined by taking the values from the bottom row of Table 4-14 and deducting the return flows from each year (1928- 2008). From 1928 through 1948, there were no return flows because the Columbia Basin project was not yet in place, so the incremental return flow would just be the values as shown in the below table. From 1948 – 2008, the incremental return flows were interpolated between every 10 years of calculated data such that the increment in 2008 was zero. Both MRF5D and B235D (discussed in Section 4.4.2) contribute towards the accumulated depletions (MCN5DD) at McNary Dam. Table 4-14. Total Return Flows to McNary Reservoir

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Groundwater Return(cfs) 99 94 78 75 68 75 90 113 129 126 127 113Wasteway Flows (cfs) 157 157 241 397 400 413 421 405 452 439 255 140Pumping at Pasco (cfs) 74 67 89 94 66 87 86 81 82 74 73 76Springs at Ringold (cfs) 25 25 25 25 25 25 25 25 25 25 25 25Blocks 2 & 3 (cfs) 9.0 8.8 7.8 14.1 14.2 15.0 15.8 17.8 19.2 16.9 11.5 10.3Block 1 (cfs) 17.6 17.2 14.9 23.0 22.9 24.4 26.4 30.1 33.0 29.6 22.5 20.1

Total Return Flow (cfs) 382 368 456 628 595 639 664 672 741 710 513 385

Page 98

Section 5 Results This study utilized several methods to estimate and incorporate the effect of irrigation so that the 80 years of Columbia River Basin flows from 1928 to 2008 would be normalized to a 2008 level of irrigation development. The irrigated acres, depletions, and modified flows generated in this study are compared with the data from the 2000 Modified Streamflows study to highlight changes in calculated flows.

5.1 Changes in Depletion: 2000 Level vs 2010 Level The purpose of this section is to present how irrigated acres have changed across the basin since the 2000 level study and to document what effect this has on the incremental depletions. A comparison of the common 70 years (1928-1999) of depletions between the 2010 study and the 2000 study is done to highlight differences caused by updating depletions to current levels of irrigation. The incremental depletion differences between the 4D (2000 level depletions) and 5D (2010 level depletions) datasets at each basin are shown in Table 5-1 for WY 1929, WY 1937 and also for the common 70 year average. Data for WY 1929 is shown because it is the year which is most likely to have the smallest amount of irrigated acreage compared to the irrigated acreage now, and hence the largest depletion adjustment. Data for WY 1937 is shown because it is a critical year which is of interest to water managers in the region. The 4D and 5D values in Table 5-1 reflect how much water was added or removed from the observed flows to account for the 2000 level and 2010 level depletions, respectively. A negative sign indicates water removed from the river due to increased irrigations, while a positive sign indicates water added back to the river due to less irrigation. The relationship between the depletion differences and irrigated acres can be summarized as follows: a positive/negative difference between the 4D and 5D values are due to a corresponding negative/positive difference in irrigated acreage between the two studies. Irrigated acres generally decreased over the last nine years except in the Lower Snake basin where irrigated acres increased by 72,400 acres (Table 5-1). The overall reduction in irrigated acres resulted in smaller incremental depletions in this study than in the 2000 study. Changes to the modified flows at special study areas (Yakima, Deschutes above Round Butte, Snake above Brownlee, and the Columbia Basin Project return flow) are highlighted separately.

Page 99

Table 5-1. Comparison of 2000 and 2010 Irrigated Acreages and Depletions by Basin

Irri

gat

ed

Irri

gat

ed

Dif

fere

nce

sW

Y 1

929

WY

19

29W

Y 1

937

WY

193

7 7

0 W

Y A

vg 7

0 W

Y A

vgA

cres

Acr

es

Fro

m4D

5D

Diff

ere

nce

4D5D

Diff

eren

ce4D

5DD

iffer

ence

200

0 L

evel

2010

Lev

el

200

0 L

eve

lcf

scf

scf

scf

scf

scf

scf

scf

scf

sU

pp

er C

olu

mb

ia &

Ko

ote

na

y(1

000

's A

cre

s)(1

000'

s A

cres

)(1

000'

s A

cres

)

Up

per

Co

lum

bia

ab

ove

Mic

aU

PC

13.8

6.2

-7.6

-16

-21

4-1

5-1

14-8

614

Co

lum

bia

Bas

in M

ica

to K

een

leys

ide

AR

D4.

42.

2-2

.2-9

-36

-8-2

6-5

05

Co

lum

bia

Bas

in K

een

leys

ide

to P

end

Ore

ille

CT

R1.

71.

5-0

.2-3

-21

-3-2

1-2

-11

Ea

st K

oote

nai i

n B

CE

KO

30.2

14.9

-15.

3-5

4-2

23

2-5

2-2

231

-38

-137

Ko

ote

nai i

n M

onta

na

KM

T8.

95.

1-3

.8-5

51

0-5

510

-19

10K

oot

ena

i in

Idah

oK

ID2.

41.

5-0

.9-3

-12

-3-1

2-2

02

We

st K

oote

nay

at C

orra

Lin

nW

KO

17.2

5.7

-11.

5-3

3-7

26

-31

-626

-20

525

Slo

can

BR

I4.

00.

4-3

.6-8

08

-71

8-4

48

Su

bto

tal

82.6

37.5

-45.

1-1

31-3

29

9-1

24

-28

98-8

022

102

Pe

nd

Ore

ille

and

Sp

ok

ane

Up

per

Fla

thea

dF

LT36

.624

.8-1

1.8

-60

-33

27

-58

-31

27-2

8-4

24F

lath

ead

Irrig

atio

n D

istr

ict

FID

121

.599

.6-2

1.9

-198

-148

50

-14

5-9

550

-46

652

Up

per

Cla

rk F

ork

UC

F14

1.6

146

.85

.2-2

6-3

3-7

-24

-31

-7-1

7-2

4-7

Bitt

erro

otB

IT93

.685

.4-8

.24

46

21

844

6218

3351

18L

ower

Cla

rk F

ork

LCF

15.6

14.1

-1.5

15

46

94

1619

3P

end

Ore

ille

in B

CP

OC

1.1

1.1

0-2

-20

-2-2

0-1

-10

Pe

nd O

reill

e in

US

AP

EN

4.0

1.5

-2.5

05

51

65

59

4S

pok

ane

Riv

er B

asin

Tot

al

SP

V28

.725

.8-2

.92

17

75

625

9368

2074

54S

ub

tota

l44

2.7

399

.1-4

3.6

-220

-67

153

-15

311

165

-18

130

148

Mid

-Co

lum

bia

Ke

ttle

in B

CK

ET

26.9

8.7

-18.

2-4

9-9

40

-48

-840

-29

1241

Fer

ry-S

teve

nsF

ER

16.8

17.1

0.3

-27

-26

1-2

2-2

11

-1-2

-1O

kano

gan

-Sim

ilkam

een

in B

CO

KA

124

.962

.8-6

2.1

-87

46

134

-76

5813

4-3

310

213

5O

kana

gan

-Me

thow

in U

SA

OK

M39

.431

.0-8

.4-2

34

28

-18

927

-818

26C

hel

an-

Ent

iat-

We

natc

hee_

W B

anks

Lak

eC

EW

55.2

99.0

43.8

-38

-223

-185

-28

-20

7-1

79-4

-16

7-1

63S

ub

tota

l26

3.2

218

.6-4

4.6

-224

-208

18

-19

2-1

69

23-7

5-3

738

Lo

we

r S

nak

eU

ppe

r S

alm

onU

PS

103

.811

6.1

12.3

-49

-87

-37

-23

-61

-39

23-1

9-4

2L

ower

Sa

lmon

LWS

15.6

12.7

-2.9

41

41

04

1410

312

10G

ran

de R

ond

eW

EN

85.0

104

.519

.52

7-2

2-4

931

-17

-49

20-3

0-5

0C

lear

wa

ter

CLR

6.7

3.7

-3.0

-5-1

4-5

-14

-50

5P

alo

use

-Low

er

Sna

keP

LS60

.810

7.3

46.5

55

-242

-187

55-2

42

-187

-35

-20

5-1

69S

ub

tota

l27

1.9

344

.372

.43

2-3

38-2

5962

-30

7-2

616

-24

2-2

46

Lo

we

r C

olu

mb

iaW

alla

Wal

la R

ive

rW

WA

107

.581

.4-2

6.1

-131

-128

2-1

31

-12

82

-84

-58

26Jo

hn

Day

Riv

er B

asi

nJD

A55

.852

.8-3

.0-1

3-1

30

-11

-91

-5-2

2U

mat

illa

Riv

er &

Will

ow

Cre

ekU

MW

142

.621

.4-1

21.2

-169

75

244

-16

877

245

-16

661

227

Pu

mp

ing

from

Jo

hn D

ay

to N

orth

Sid

eN

SJ

19.3

29.5

10.2

-37

-98

-61

-37

-98

-61

-25

-76

-51

De

schu

tes

Riv

er

Bas

in--

Wh

ite R

ive

r-W

apin

ita p

roj

WH

T12

.26.

5-5

.7-1

3-2

12

-10

312

014

14K

licki

tat R

iver

Bas

inK

LC12

.525

.813

.3-1

1-3

0-1

9-1

1-3

0-1

9-8

-27

-19

Ho

od R

ive

r B

asin

HO

D38

.631

.2-7

.4-2

5-1

11

4-2

1-7

14-1

16

17W

hite

Sal

mon

WH

S6.

80.

9-5

.9-4

10

14

-410

14-2

1214

Su

bto

tal

395

.324

9.5

-145

.8-4

03-1

972

06-3

93

-18

220

8-3

01

-70

230

Will

amet

teF

ern

Rid

ge

FR

N1.

43.

72

.3-4

-40

-3-3

-1-1

-2-1

Alb

any

ALB

1018

110

205

24

128

67

1306

419

714

360

144

09

49S

ale

mS

LM

1642

016

465

45

208

76

2108

721

123

624

236

99

75S

ulli

van

SV

N21

291

213

819

02

674

827

003

255

3129

33

140

511

2T

otal

Will

amet

te B

asin

WM

T18

9.8

171

.7-1

8.1

-413

-296

117

-37

1-2

63

108

-14

8-8

464

2000

vs

201

0 le

vel i

ncr

emen

tal d

eple

tio

ns:

4D

vs

5D

Page 100

5.2 Comparison of 2000 vs. 2010 Modified Flows The 2000 Modified Streamflows are compared with the 2010 Modified Streamflows to highlight the total effect of the 2010 level of irrigation depletions discussed in the previous section, as well as the effect of adding nine years of observed streamflows. Note that the 2000 level modified flow has 71 years of data (1928-1998) and that the 2010 level modified flows has 80 years of data (1928-2008). If only the concurrent periods of record (1928-1999) of the two datasets were compared, the effect of adding the nine most recent years of streamflows to the 2010 level modified flows would be missed. Therefore, the 71 year dataset was compared with the 80-year dataset. In the following sections, results are presented for the most downstream modified flow point in each basin. The effect of the USBR special studies are highlighted at the end of this section as well.

5.2.1 Upper Columbia and Kootenay The 2010 level modified flows compared to the 2000 level modified flows at Murphy Creek,BC are essentially unchanged (Table 5-2, Figure 5-1) The average monthly flow differs by no more than ±2% in any particular month (Table 5-2) and is slightly higher in the winter months and slightly lower in the summer months.

Mar May Jul Sep Nov

3000

cfs

0

50,000

100,000

150,000

200,000

MUC4M [01JUL1928-30SEP1999] AVERAGE MUC5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-1. Upper Columbia Basin at Murphy Creek Dam – Average Daily 4M vs. 5M

Page 101

Table 5-2. Upper Columbia Basin at Murphy Creek Dam - Average Monthly 4M vs. 5M month MUC4M (cfs) MUC5M (cfs) Diff. (cfs) % Change

Jan 18004 18401 397 2Feb 17742 17859 117 1Mar 20944 21378 434 2Apr 52188 52518 330 1May 154459 154144 -315 0Jun 215893 215302 -591 0Jul 153067 152233 -834 -1Aug 87528 85789 -1739 -2Sep 51528 50606 -922 -2Oct 36068 35860 -208 -1Nov 28161 28625 464 2Dec 21735 21900 165 1

Annual 71715 71529 -186 0

5.2.2 Pend Oreille and Spokane The average 2010 level modified flow at Seven Mile, BC is 433 cfs (2%) lower (Table 5-3) than in the 2000 level study. The largest absolute difference is observed during the peak runoff months of May and June where flows on average are 1331 cfs and 1285 cfs lower, respectively (Table 5-3, Figure 5-2).

Mar May Jul Sep Nov

3000

cfs

0

20,000

40,000

60,000

80,000

100,000

SEV4M [01JUL1928-30SEP1999] AVERAGE SEV5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-2. Pend Oreille Basin at Seven Mile Dam – Average Daily 4M vs. 5M

Page 102

Table 5-3. Pend Oreille Basin at Seven Mile Dam- Average Monthly 4M vs. 5M month SEV4M (cfs) SEV5M (cfs) Diff. (cfs) % Change

Jan 12017 11982 -35 0Feb 13457 13175 -282 -2Mar 17493 17397 -96 -1Apr 38964 38539 -425 -1May 82422 81091 -1331 -2Jun 81746 80461 -1285 -2Jul 31706 31195 -511 -2Aug 11598 11485 -113 -1Sep 9154 9031 -123 -1Oct 10739 10461 -278 -3Nov 13268 13196 -72 -1Dec 13329 13060 -269 -2

Annual 28025 27581 -444 -2 The average 2010 level modified flow at Little Falls Dam, WA is slightly lower (1%) than in the 2000 level study (Table 5-4, Figure 5-3). The largest reduction in flows is observed in April and May where the flows are 279 cfs and 256 cfs lower, respectively.

Mar May Jul Sep Nov

3000

cfs

0

5,000

10,000

15,000

20,000

LFL4M [01JUL1928-30SEP1999] AVERAGE LFL5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-3. Spokane Basin at Little Falls Dam– Average Daily 4M vs. 5M

Page 103

Table 5-4. Spokane Basin at Little Falls Dam - Average Monthly 4M vs. 5M month LFL4M (cfs) LFL5M (cfs) Diff. (cfs) % Change

Jan 6681 6655 -26 0Feb 8646 8460 -186 -2Mar 10961 10906 -55 -1Apr 17715 17436 -279 -2May 18872 18616 -256 -1Jun 10053 10097 44 0Jul 3600 3678 78 2Aug 1997 2050 53 3Sep 1845 1826 -19 -1Oct 2321 2276 -45 -2Nov 3848 3800 -48 -1Dec 6117 5966 -151 -2

Annual 7707 7618 -89 -1

5.2.3 Mid-Columbia The 2010 level average modified flow at Priest Rapids, WA (Table 5-5, Figure 5-4) is only 1% lower than in the 2000 level study. However the average flow in September is 6% lower in this study.

Mar May Jul Sep Nov

3000

cfs

0

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

PRD4M [01JUL1928-30SEP1999] AVERAGE PRD5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-4. Mid-Columbia Basin at Priest Rapids Dam – Average Daily 4M vs. 5M

Page 104

Table 5-5. Mid-Columbia Basin at Priest Rapids Dam- Average Monthly 4M vs. 5M month PRD4M (cfs) PRD5M (cfs) Diff. (cfs) % Change

Jan 42863 43394 531 1Feb 46925 46910 -15 0Mar 59067 58004 -1063 -2Apr 122684 121795 -889 -1May 289694 286006 -3688 -1Jun 345488 342170 -3318 -1Jul 202411 199724 -2687 -1Aug 102344 102020 -324 0Sep 63193 59504 -3689 -6Oct 51759 50467 -1292 -2Nov 51093 51865 772 2Dec 47745 47204 -541 -1

Annual 119069 117674 -1395 -1

5.2.4 Lower Snake The 2010 level modified flows are significant lower at Ice Harbor, WA compared to the 2000 level modified flows (Table 5-6, Figure 5-5). On average the flows are 2990 cfs lower (6%) with the biggest reduction in the August through October time frame (17%, 18%, and 13% respectively). The USBR’s change in methodology on the Snake River Basin above Brownlee is the likely cause of the large reduction in modified flows at Ice Harbor. A more detailed description of results due to this methodology change is described in Section 5.2.7.

Mar May Jul Sep Nov

3000

cfs

0

20,000

40,000

60,000

80,000

100,000

120,000

140,000

IHR4M [01JUL1928-30SEP1999] AVERAGE IHR5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-5. Lower Snake Basin at Ice Harbor Dam – Average Daily 4M vs. 5M

Page 105

Table 5-6. Lower Snake Basin at Ice Harbor Dam - Average Monthly 4M vs. 5M

month IHR4M (cfs) IHR5M (cfs) Diff. (cfs) % ChangeJan 35104 33873 -1231 -4Feb 43414 40938 -2476 -6Mar 53701 52056 -1645 -3Apr 81802 76744 -5058 -6May 119175 115121 -4054 -3Jun 109431 107514 -1917 -2Jul 42027 38185 -3842 -9Aug 22214 18397 -3817 -17Sep 21520 17745 -3775 -18Oct 25159 21908 -3251 -13Nov 28313 26484 -1829 -6Dec 32848 29915 -2933 -9

Annual 51191 48125 -3066 -6

5.2.5 Lower Columbia Although The Dalles Dam is not the most downstream point in the Lower Columbia Basin, results are shown because it is an important point to many users. Average 2010 level modified flows are 2% lower than in the 2000 level study (Table 5-7, Figure 5-6). The most significant reduction is in September and October where flows are on average 9% and 6% lower. The methodology change on the Snake River is the most likely source of the reduction in modified flows at The Dalles. A more detailed description of results due to this methodology change is described in Section 5.2.7. Results at Bonneville Dam are also shown in this section as it is the most downstream point in the Lower Columbia Basin. Since Bonneville Dam and The Dalles Dam are so close, the results at Bonnville Dam are essentially the same as at The Dalles Dam (Table 5-8, Figure 5-7).

Page 106

Mar May Jul Sep Nov

3000

cfs

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

500,000

550,000

TDA4M [01JUL1928-30SEP1999] AVERAGE TDA5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-6. Lower Columbia Basin at The Dalles Dam – Average Daily 4M vs. 5M Table 5-7. Lower Columbia Basin at The Dalles Dam - Average Monthly 4M vs. 5M

month TDA4M (cfs) TDA5M (cfs) Diff. (cfs) % ChangeJan 93810 93995 185 0Feb 107392 105580 -1812 -2Mar 131190 128973 -2217 -2Apr 220891 215168 -5723 -3May 422795 414075 -8720 -2Jun 469482 464102 -5380 -1Jul 251685 245739 -5946 -2Aug 132011 127019 -4992 -4Sep 93253 84943 -8310 -9Oct 85756 80915 -4841 -6Nov 90963 89738 -1225 -1Dec 95252 91953 -3299 -3

Annual 183102 178603 -4499 -2

Page 107

Mar May Jul Sep Nov

3000

cfs

50,000

100,000

150,000

200,000

250,000

300,000

350,000

400,000

450,000

500,000

550,000

BON4M [01JUL1928-30SEP1999] AVERAGE BON5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-7. Lower Columbia Basin at Bonneville Dam – Average Daily 4M vs. 5M Table 5-8. Lower Columbia Basin at Bonneville Dam - Average Monthly 4M vs. 5M

month BON4M (cfs) BON5M (cfs) Diff. (cfs) % ChangeJan 101312 101090 -222 0Feb 115149 112910 -2239 -2Mar 137805 135495 -2310 -2Apr 226759 221155 -5604 -2May 425754 417802 -7952 -2Jun 471032 466483 -4549 -1Jul 254631 249248 -5383 -2Aug 134318 129994 -4324 -3Sep 95268 86887 -8381 -9Oct 88044 83054 -4990 -6Nov 95578 94156 -1422 -1Dec 102040 98219 -3821 -4

Annual 187519 183110 -4409 -2

5.2.6 Willamette The average 2010 modified flow at Sullivan Dam on the Willamette River is 1% lower than in the 2000 level study (Table 5-9, Figure 5-8). The largest difference is observed in July where flows are 6% higher and in October where flows are 5% lower.

Page 108

Mar May Jul Sep Nov

3000

cfs

0

10,000

20,000

30,000

40,000

50,000

60,000

70,000

80,000

SVN4M [01JUL1928-30SEP1999] AVERAGE SVN5M [01JUL1928-30SEP2008] AVERAGE

Figure 5-8. Willamette Basin at T.W. Sullivan Dam – Average Daily 4M vs. 5M Table 5-9. Willamette Basin at T.W. Sullivan Dam - Average monthly 4M vs. 5M

month SVN4M (cfs) SVN5M (cfs) Diff. (cfs) % ChangeJan 65324 65520 196 0Feb 60704 59207 -1497 -2Mar 49465 48693 -772 -2Apr 39133 38720 -413 -1May 27026 26988 -38 0Jun 16095 16299 204 1Jul 6421 6815 394 6Aug 3966 4050 84 2Sep 4375 4424 49 1Oct 9154 8733 -421 -5Nov 34225 33047 -1178 -3Dec 61165 60782 -383 -1

Annual 31268 30901 -367 -1

5.2.7 USBR Special Studies Special Studies were conducted by the USBR for three of the areas within the Columbia Basin that have extensive irrigation. A comparison of the results for these studies is shown in Table 5-10. The concurrent periods of record between the two studies is compared to highlight differences caused by any change in methodology.

Page 109

Table 5-10. USBR Special Study Points

Special Study Points 2000 Level 2010 Level DifferenceSnake River above Brownlee 19216 17355 -1861Yakima River Basin 3520 3376 -144Deschutes River above Round Butte 4540 4513 -27

Average Flow (WY1929-1999, cfs)

Minor variation in flows occurred for the Yakima and Deschutes Basin studies. In contrast, the calculated modified flows for the Snake River above Brownlee are significantly lower than the 2000 modified flows data set. The 2010 modified flows incorporate the current level of irrigation development, which better reflects the effects of groundwater pumping. The 2010 modified flows data set is considered a more accurate estimation of 2010 conditions because all years reflect the same current level of groundwater impacts. The previous modified flow analysis was modeled with an estimated 1.5 million acre feet (MAF) of groundwater pumping. The response attributable to the groundwater pumping on the Eastern Snake Plane Aquifer was only at year 2000 levels, representing less than the steady state condition of 1.5 MAF. The 2010 Modified Flow analysis incorporated 2.0 MAF of total groundwater pumping above King Hill for irrigation purposes, as reported by the Department of Idaho Water Resources (IDWR). As a result, the annual volumes presented for the 2010 Modified Flow analysis are lower. This equates to an additional amount of aquifer depletion as well as an additional nine years of aquifer response to the additional groundwater pumping effects and surface water irrigation practices.

Page 110

References Blaney, H.F. and W.D. Criddle, 1950. Determining water requirements in irrigated areas for climatological

and irrigated data. Soil Conservation Service Technical Procedures (SCS-TP-96). Soil Conservation Service, US Department of Agriculture, Washington, DC. 50pp.

BPA, 1970. 1970 Level Modified Streamflow. Bonneville Power Administration, Department of Energy.

Portland, OR. BPA, 1980. 1980 Level Modified Streamflow. Bonneville Power Administration, Department. of Energy.

Portland, OR. BPA, 1990. 1990 Level Modified Streamflow. A.J. Crook Co., for the Bonneville Power Administration,

Department of Energy. Portland, OR BPA, 2000. 2000 Level Modified Streamflow. Bonneville Power Administration, Department. of Energy.

Portland, OR. CRWMG, 1980. Irrigated Lands in the Pacific Northwest 1980. Report for the Land Resources

Committee of the Pacific Northwest, NW River Basins Commission, Depletions Task Force, Columbia River Water Management Group.

CRWMG, 1988: Special Studies and Computer Applications to Streamflow Depletion. NW River Basins

Commission, Depletions Task Force, Columbia River Water Management Group (October, 1988). ESRI, 2006: ArcGIS version 9.2 (software). Environmental Systems Research Institute, Inc.,

Redlands, CA. FAO, 2011 (and previous years). Global Map of Irrigation Areas: United States of America. Food and

Agricultural Organizations of the United Nations. Available on line at: http://www.fao.org/nr/water/aquastat/irrigationmap/us/index.stm.

King, L.D., M.L. Hellickson, and M.N. Shearer, 1980. Supplemental Report to Energy and Water

Consumption of Pacific Northwest Irrigation Systems. Battelle Pacific Northwest Laboratories, Richland, WA. 88 pp.

Mundorff, M.J., 1952. Return Flow Study: Columbia Basin Project Area. US Geological Survey,

Washington, DC. NRCS, 1993. Irrigation Water Requirements. National Engineering Handbook. Part 623. Section 2.

Natural Resources Conservation Service, US Department of Agriculture. Available on line at: http://irrigationtoolbox.com/NEH/Part623_Irrigation/H_210_623_02.pdf

NRCS, 2003. Irrigation Water Requirements (software version 1.0). Natural Resources Conservation

Service, US Department of Agriculture. SCS, 1967. Irrigation water requirements. Technical Release No. 21. Engineering Division, Soil

Conservation Service, US Department of Agriculture. 88 pp. SCS, 1976. Crop Consumptive Irrigation Requirements and Irrigation Efficiency Coefficients for United

States. Special Projects Division, Soil Conservation Service, US Department of Agriculture. 141pp.

Page 111

Page 112

USACE, 1991. SSARR: Model Streamflow Synthesis and Reservoir Regualtion Model. North Pacific Division, US Army Corp of Engineers, Portland, OR. Available on line at: http://www.nwd-wc.usace.army.mil/report/ssarr.htm.

USACE, 2007. HEC-ResSim: Reservoir Systems Simulation. Hydrologic Engineering Cener, US Army

Corp of Engineers, Davis, CA. Available on line at: http://www.hec.usace.army.mil/software/hec-ressim.

USACE, 2009. HEC-DSSVue: HEC Sata Storage System Visual Utility Engine. Hydrologic Engineering

Center, US Army Corp of Engineers, Davis, CA. Available on line at: http://www.hec.usace.army.mil/software/hec-dss/hecdssvue-dssvue.htm.

USBR, 1984. Columbia Basin Project. US Bureau of Reclamation, Department of Interior,

Washington, DC. USBR, 2007. 2007 Monthly Water Distributions Report. US Bureau of Reclamation, Department of

Interior. USDA, 2007. 2007 Census of Agriculture Report. US Department of Agriculture. 739 pp. USGS, 2011. Elevation Derivatives for National Applications (EDNA) Tool. US Geological Survey.

Available on line at: http://edna.usgs.gov. USGS, 2005a. Compilation of Information for Spokane Valley – Rathdrum Prairie Aquifer, Washington

and Bonner and Kootenai Counties, Idaho. USGS Scientific Investigations Report, 2005-5227. Available on line at: http://pubs.usgs.gov/sir/2005/5227/index.html.

USGS, 2005b. Water Use Data (digital database). Available on line at: http://water.usgs.gov/watuse/data.

Appendix A – List of Points id name basin section H S A L ARF D DD E EE M

ACL "A" Canal Diversion Western Oregon 3.9 x x ALB Albany Willamette 3.7 x x x x ALD Alder Western Washington 3.8 x x ALF Albeni Falls Pend Oreille 3.2 x x x x x x x ANA Anatone Lower Snake 3.5 x x x x ARD Hugh Keenleyside Upper Columbia 3.1 x x x x x x x x x x B23 Pump to Blocks 2 & 3 Lower Columbia 3.6, 4.1 x BCL Big Cliff Willamette 3.7 x x BDY Boundary Pend Oreille 3.2 x x x x x x x BFE Bonners Ferry Libby 3.1 x x x x BIT Bitterroot Pend Oreille 3.2 x BLU Blue River Willamette 3.7 x x x x BON Bonneville Lower Columbia 3.6 x x x x x x x BOX Box Pend Oreille 3.2 x x x x x x x BRI Brilliant Kootenay 3.1 x x x x x BRN * Brownlee Lower Snake 3.5, 4.2 x x x x x x C_S Carmen-Smith PP inflow Willamette 3.7 x x CAB Cabinet Pend Oreille 3.2 x x x x x x x CAN Kootenay Canal Kootenay 3.1 x CAR Carmen Diversion Willamette 3.7 x x CEW Chelan-Entiat-Wenatchee-

West of Banks LakeMid-Columbia 3.3 x

CFM Columbia Falls Pend Oreille 3.2 x x x CGR Cougar Willamette 3.7 x x x x CHJ Chief Joseph Mid-Columbia 3.3 x x x x x x x x CHL Chelan Mid-Columbia 3.3 x x x x CLR Clearwater Lower Snake 3.5 x COE Coeur D'Alene Spokane 3.2 x x x x x COR Corra Linn Kootenay 3.1 x x x x x x x x COT Cottage Grove Willamette 3.7 x x x x CS1 Cushman 1 Western Washington 3.8 x x CS2 Cushman 2 Western Washington 3.8 x x CTR Columbia at Trail Upper Columbia 3.1 x x DCD Duncan Kootenay 3.1 x x x x x DET Detroit Willamette 3.7 x x x x DEX Dexter Willamette 3.7 x DIA Diablo Western Washington 3.8 x x DOR Dorena Willamette 3.7 x x x x DWR Dworshak Lower Snake 3.5 x x x x x EKO East Kootenay above Newgate Kootenay 3.1 x FAL Falls Creek Willamette 3.7 x x x x FAR Faraday Willamette 3.7 x FDR** Franklin D. Roosevelt Lake Mid-Columbia 3.3 FER Ferry-Stevens Mid-Columbia 3.3 x FID Flathead Irrigation District Pend Oreille 3.2 x FLT Upper Flathead Pend Oreille 3.2 x FOS Foster Willamette 3.7 x x x x x x FRN Fern Ridge Willamette 3.7 x x x x x x GAL Galloway Lower Snake 3.5 x x GCL Grand Coulee Mid-Columbia 3.3 x x x x x x x x x x GOR Gorge Western Washington 3.8 x x GPR Green Peter Willamette 3.7 x x x x HCD Hells Canyon Lower Snake 3.5 x x x x x x x x HCR Hills Creek Willamette 3.7 x x x x HGH Hungry Horse Pend Oreille 3.2 x x x x x HOD Hood River Lower Columbia 3.6 x HYD Carmen Div. Max 630 cfs Willamette 3.7 x

x

x

x

x

x

x

Page A-1

id name basin section H S A L ARF D DD E EE M IHR Ice Harbor Lower Snake 3.5 x x x x x x JCB John C. Boyle Western Oregon 3.9 x x x x JDA John Day Lower Columbia 3.6 x x x x x x x x x x JDP Pumping/Returns from John

Day to Morrow/GilliamLower Columbia 3.6 x

KEN Kennewick Lower Columbia 3.6 x KER Kerr Pend Oreille 3.2 x x x x x x x KET Kettle Mid-Columbia 3.3 x KID Kootenai-Idaho Kootenay 3.1 x KLA Klamath Lake Western Oregon 3.9 x x KLC Klickitat Lower Columbia 3.6 x KMT Kootenai-Montana Kootenay 3.1 x LAG Lagrande Western Washington 3.8 x x LBN Lower Bonnington Kootenay 3.1 x LCF Lower Clark Fork Pend Oreille 3.2 x LEA Leaburg Willamette 3.7 x x x x LFL Little Falls Spokane 3.2 x LGS Little Goose Lower Snake 3.5 x x x x x x LIB Libby Kootenay 3.1 x x x x x x LIM Lime Point Lower Snake 3.5 x x x LLK Long Lake Spokane 3.2 x x x x x LMN Lower Monumental Lower Snake 3.5 x x x x x x x x x LNK Link R. Western Oregon 3.9 x x LOP Lookout Point Willamette 3.7 x x x x x x LOS Lost Creek Western Oregon 3.9 x x x x LWG Lower Granite Lower Snake 3.5 x x x x x x x x x LWS Lower Salmon Lower Snake 3.5 x MAY Mayfield Western Washington 3.8 x x x x MCD Mica Upper Columbia 3.1 x x x x x x MCN McNary Lower Columbia 3.6 x x x x x x x x x MER Aerial (Merwin) Western Washington 3.8 x x MON Monroe Street Spokane 3.2 x MOS Mossyrock Western Washington 3.8 x x x x x MRF McNary Return Flow Lower Columbia 3.6, 4.1 x MUC Murphy Creek Upper Columbia 3.1 x x x x x NFK North Fork Willamette 3.7 x x x x NIN Nine Mile Spokane 3.2 x x NOX Noxon Rapids Pend Oreille 3.2 x x x x x x x x x NSJ Pumping/Returns from John

Day to NorthsideLower Columbia 3.6 x

NSM Pumping from McNary to Northside

Lower Columbia 3.6 x

NSR Return flow from McNary pumping to Northside

Lower Columbia 3.6 x

OAK Oak Grove Willamette 3.7 x x OKA Okanagon in Canada Mid-Columbia 3.3 x OKM Methow-Okanagan Mid-Columbia 3.3 x ORO Orofino Lower Snake 3.5 x x OXB Oxbox Lower Snake 3.5 x PAK Packwood Lake Western Washington 3.8 x x x PEL Pelton Lower Columbia 3.6 x x PEN Pend Oreille Pend Oreille 3.2 x PFL Post Falls Spokane 3.2 x PLS Palouse-Lower Snake Lower Snake 3.5 x POC Pend Oreille in Canada Pend Oreille 3.2 x PPL "A" Canal depletion Western Oregon 3.9 x PRD Priest Rapids Mid-Columbia 3.3 x x x x x x x x x PRF Priest Rapids Return Flow Mid-Columbia 3.3, 4.1 x PSL Priest Lake Pend Oreille 3.2 x x x x RAT Rathdrum Prairie Canal Spokane 3.2 x RER Pelton Rereg Lower Columbia 3.6 x RIS Rock Island Mid-Columbia 3.3 x x x x x x x

x

x

x

x

x

x

x

x

x

Page A-2

id name basin section H S A L ARF D DD E EE M RML River Mill Willamette 3.7 x ROS Ross Western Washington 3.8 x x ROU* Round Butte Lower Columbia 3.6, 4.2 x x x x x x RRH Rocky Reach Mid-Columbia 3.3 x x x x x x x x x RVC Revelstoke Upper Columbia 3.1 x x x x x x x x x SEV Seven Mile Pend Oreille 3.2 x x x x x x x SHA Lower Baker Western Washington 3.8 x x SLM Salem Willamette 3.7 x x x x SLO Slocan Kootenay 3.1 x SMH Smith R. Reservoir Willamette 3.7 x x SPD Spalding Lower Snake 3.5 x x x SPO Spokane Valley Farms Canal Spokane 3.2 x SPV Spokane Valley Spokane 3.2 x SUV Sullivan Lake Pend Oreille 3.2 x x SVN T.W. Sullivan Willamette 3.7 x x x x x SW2 Swift 2 Western Washington 3.8 x SWF Swift 1 Western Washington 3.8 x x TDA The Dalles Lower Columbia 3.6 x x x x x x x x x TMY Timothy Meadows Willamette 3.7 x x x x TOM Thompson Falls Pend Oreille 3.2 x x x x x x x TRB Trail Bridge Willamette 3.7 x x x TRY Troy Lower Snake 3.5 x x UBK Upper Baker Western Washington 3.8 x x UBN Upper Bonnington Kootenay 3.1 x UCF Upper Clark Fork Pend Oreille 3.2 x UMP Pumping from McNary to

UmatillaLower Columbia 3.6 x

UMR Return flow from McNary pumping to Umatilla

Lower Columbia 3.6 x

UMW Umatilla River and Willow Cree

x

x

x

x

x

kLower Columbia 3.6 x

UPC Upper Columbia above Mica Upper Columbia 3.1 x UPF Upper Falls Spokane 3.2 x x x UPS Upper Salmon Lower Snake 3.5 x WAN Wanapum Mid-Columbia 3.3 x x x x x x x x WAT Waneta Pend Oreille 3.2 x x x x x WAV Walterville Willamette 3.7 x x x x WEL Wells Mid-Columbia 3.3 x x x x x x x x x WEN Grande Ronde Lower Snake 3.5 x WHB White Bird Lower Snake 3.5 x x WHS White Salmon Lower Columbia 3.6 x WHT White River - Wapinitia Lower Columbia 3.6 x WKO West Kootenay Kootenay 3.1 x WMT Willamette Willamette 3.7 x WRF Wanapum Return Flow Mid-Columbia 3.3, 4.1 x WWA Walla Walla Lower Columbia 3.6 x YAK* Yakima Mid-Columbia 3.3, 4.2 x x YAL Yale Western Washington 3.8 x x

x

x

x

*BRN, ROU, and YAK have an additional data type, R, which is flow data provided by the USBR (Supplemental Report) **FDR has two additional data types: G and P, which are generation and pumping flow data (Section 3.3.3)

Page A-3

This page is intentionally left blank

Appendix B – River Schematics The following section presents the data sources or methods used in the gathering of H,S, and A data at each modified flow project or point. The table includes the period of record of the data source, the source of that data, and any special comments about the data used. A schematic of the modified flow point along with the historical and current gages is provided. Presented alongside each streamflow gage in the schematic is the site’s period of record and the drainage area (denoted in schematics as “DA”) above the site. River miles are shown for each dam site and gaging station. The modified flow points are listed in upstream to downstream order. Below is an index to the River Schematics as they appear in this appendix.

id name basin page MCD Mica Upper Columbia B-5 RVC Revelstoke Upper Columbia B-6 ARD Hugh Keenleyside Upper Columbia B-7 LIB Libby Kootenai B-8 BFE Bonners Ferry Kootenai B-9 DCD Duncan Kootenay B-10 COR Corra Linn Kootenay B-11 BRI Brilliant Kootenay B-12 MUC Murphy Creek Upper Columbia B-13 HGH Hungry Horse Pend Oreille B-14 CFM Columbia Falls Pend Oreille B-15 KER Kerr Pend Oreille B-16 TOM Thompson Falls Pend Oreille B-17 NOX Noxon Rapids Pend Oreille B-18 CAB Cabinet Pend Oreille B-19 PSL Priest Lake Pend Oreille B-20 ALF Albeni Falls Pend Oreille B-21 BOX Box Pend Oreille B-22 BDY Boundary Pend Oreille B-23 SEV Seven Mile Pend Oreille B-24 COE Coeur D'Alene Spokane B-25 UPF Upper Falls Spokane B-26 NIN Nine Mile Spokane B-27 LLK Long Lake Spokane B-28 GCL Grand Coulee Mid-Columbia B-29 FDR Franklin D. Roosevelt Lake Mid-Columbia B-30 CHJ Chief Joseph Mid-Columbia B-31 WEL Wells Mid-Columbia B-32 CHL Chelan Mid-Columbia B-33 RRH Rocky Reach Mid-Columbia B-34

Page B-1

id name basin page RIS Rock Island Mid-Columbia B-35 WAN Wanapum Mid-Columbia B-36 PRD Priest Rapids Mid-Columbia B-37 YAK Yakima Mid-Columbia B-38 BRN Brownlee Lower Snake B-39 HCD Hells Canyon Lower Snake B-40 WHB White Bird Lower Snake B-41 LIM Lime Point Lower Snake B-42 TRY Troy Lower Snake B-43 ANA Anatone Lower Snake B-44 ORO Orofino Lower Snake B-45 DWR Dworshak Lower Snake B-46 SPD Spalding Lower Snake B-47 LWG Lower Granite Lower Snake B-48 LGS Little Goose Lower Snake B-49 LMN Lower Monumental Lower Snake B-50 IHR Ice Harbor Lower Snake B-51 MCN McNary Lower Columbia B-52 JDA John Day Lower Columbia B-53 ROU Round Butte Lower Columbia B-54 PEL Pelton Lower Columbia B-54 TDA The Dalles Lower Columbia B-55 BON Bonneville Lower Columbia B-56 HCR Hills Creek Willamette B-57 LOP Lookout Point Willamette B-58 DEX Dexter Willamette B-58 FAL Falls Creek Willamette B-59 COT Cottage Grove Willamette B-60 DOR Dorena Willamette B-61 CAR Carmen Diversion Willamette B-62 SMH Smith R. Reservoir Willamette B-63 C_S Carmen-Smith PP inflow Willamette B-63 TRB Trail Bridge Willamette B-64 CGR Cougar Willamette B-65 BLU Blue River Willamette B-66 LEA Leaburg Willamette B-67 WAV Walterville Willamette B-68 FRN Fern Ridge Willamette B-69 ALB Albany Willamette B-70 DET Detroit Willamette B-71 GPR Green Peter Willamette B-72

Page B-2

Page B-3

id name basin page FOS Foster Willamette B-73 SLM Salem Willamette B-74 SVN T.W. Sullivan Willamette B-75 TMY Timothy Meadows Willamette B-78 OAK Oak Grove Willamette B-79 NFK North Fork Willamette B-80 SWF Swift 1 Western Washington B-81 YAL Yale Western Washington B-82 MER Aerial (Merwin) Western Washington B-83 PAK Packwood Lake Western Washington B-84 MOS Mossyrock Western Washington B-85 MAY Mayfield Western Washington B-86 CS1 Cushman 1 Western Washington B-87 CS2 Cushman 2 Western Washington B-88 LAG La Grande Western Washington B-89 ALD Alder Western Washington B-89 ROS Ross Western Washington B-90 UBK Upper Baker Western Washington B-91 LOS Lost Creek Western Oregon B-92 ACL "A" Canal Diversion Western Oregon B-93 LNK Link R. Western Oregon B-94 KLA Klamath Lake Western Oregon B-94 JCB John C. Boyle Western Oregon B-95

COLUMBIA RIVERMICA 12227100 (MCD)

river mile 1018.1 Drainage Area: 8290 Sq. Mi.

Site Period Source Comments

MCD5H 07/01/28 - 08/31/28 08NA002 Used 1990 modified flow study average monthly flow of 62,900 & 41,760 cfs for July and August, respectively. Average daily flows were developed by using these monthly flow volumes and the daily flow shape of 08NA002 (Columbia River at Nicholson).

09/01/28 - 03/31/47 Correlation Based on correlation between 08ND007 (Columbia River above Nagle Creek) and 05/01/60 - 09/30/60 Correlation developed flows for Revelstoke Dam. Q of 08ND007= a(Q of RVC4H) + b where:

a for Jan=.514; Feb=.468; Mar=.449;Apr.=.656;May=.711;Jun=.737;Jul=.695;Aug.=.625 Sep.=.590; Oct.=.565;Nov.=.611;Dec.=.495

b for Jan=930; Feb=1077; Mar=1144;Apr.=-35;May=-2732;Jun=-3075;Jul=4317 Aug = 7445; Sep.=4419; Oct.=2059;Nov.=600;Dec.=1149

04/01/47 - 04/30/60 08ND007 Observed flows of 08ND007 (Columbia River above Nagle Creek)10/01/60 - 11/30/76 08ND007 Observed flows of 08ND007 (Columbia River above Nagle Creek)

12/01/76 - 12/31/83 BCHydro PDSS project discharge from BCHydro Mica.xls spreadsheet

01/01/84 - 09/30/08 BCHydro Used PDSS data furnished by BC Hydro with following exceptions:05/01/1985 to 05/10/1985 PDSS data missing--used Corps of Engineers data08/11/1986 to 08/20/1986 PDSS data missing--used Corps of Engineers data

MCD5S 03/01/73 - 12/31/83 BCHydro Reservoir elev. from BCHydro xls spreadsheet utilizing MCD.CAP Type 7 elev./cap table

01/01/84 - 12/31/84 BCHydro Reservoir elev. from BCHydro PDSS xls spreadsheet & MCD.CAP Type 7 elev./cap table

01/01/85 - 09/30/08 BCHydro PDSS reservoir storage data was used to compute daily change-of-content

MCD5A 07/01/28 - 12/31/71 MCD_H + MCD_S

01/01/72 - 09/30/08 BC Hydro MCD_H + MCD_S was not used for computing adjusted flows after 12/31/71quality BCHydro quality controlled data was used for SSARR routing after 12/31/71control data

1,018.1

1,016.4

934.0

Mica Dam; DA=8,290

(08ND007) Columbia R. above Nagle Cr.; DA =8,290

Apr 47-Apr 60; Oct 60-Nov 76

Revelstoke Dam; DA=10,200

Columbia River

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-4

COLUMBIA RIVERREVELSTOKE CANYON 12229800 (RVC)

river mile 934 Drainage Area: 10200 Sq. Mi.

Site Period Source Comments

RVC5H 07/01/28 - 08/31/28 1990 study Used shape of 08NA002 and monthly flow volume from 1990 study (see footnote 1)

09/01/28 - 12/31/28 08ND002 Used 08ND002 x .98944 (based on drainage area)

01/01/29 - 01/31/29 08ND002 Used 08ND002 x .98944 x .7166 (see footnote 2)

02/01/29 - 12/31/31 08ND002 Used 08ND002 x .98944

01/01/32 - 05/31/32 1990 study Used 08NJ001 for shape and 1990 study value for volume (see footnote 1)

06/01/32 - 06/30/50 08ND002 Used 08ND002 x .98944 with exception of Mar 1937 and Mar 1943 (see footnote 2)March 1937 = 08ND002 x .98944 x .565March 1943 = 08ND002 x .98944 x .5623

07/01/50 - 05/31/55 08ND006 Used 08ND006 x .92727 (based on drainage area)

06/01/55 - 12/31/83 08ND011 Used 08ND011

BCHydro provided RVC5H daily values for the 1968 to 1984 time period. These revised flows were provided because backwater from Arrow Lakes affects the stage readings at Steamboat Rapids. These revised flows are included in this study.

01/01/84 - 09/30/08 BC Hydro Used BCHydro PDSS (data missing 1984.02.01 to1984.02.04 and 1985.05.01 to1985.05.10--used 08ND011). Data missing 08.11.86 to 08.20.86 obtained fromCorps of Engineers data base

Footnote 1 From 1990 modified flow study--Seven months of missing records in 1928 and 1932were taken from an old study where the data were provisionally developed by Canadian authorities.

Footnote 2 Published streamflow values for Jan. 1929, Mar. 1937 & Mar 1943 are probably in error and were provisionally revised in 1980 by Canadian authorities.

RVC5S 10/01/83 - 12/31/84 USACE Dataquery Used Corps of Engineers data base

01/01/85 - 09/30/08 BCHydro Used BCHydro PDSS midnight storage data except for 05/01/85 to 05/11/85 usedCOE data base because of missing record. RVC4S not used after 1/1/84 because BCHydro furnished quality controlled flows for 1/1/84 to 9/30/99.

RVC5A 01/01/68 - 12/31/83 08ND007+BCHydro Used BCHydro furnished data for local inflows to RVC added to 08ND007.01/01/84 - 09/30/08 BCHydro Used BCHydro furnished data for local inflows to RVC added to BCHydro furnished data for

outflows from MCD.

934.0

932.1

928.2

Revelstoke Canyon; DA=10,200

(08ND011) Columbia R. av Steamboat Rapids nr Revelstoke; DA =10,200; Jun 55-Dec 83

Columbia River

(08ND006) Columbia R. @ Twelve Mile Ferry nr Revelstoke; DA =11,000; Jul 50-May 55912.8

Arrow Lakes

(08ND002) Columbia R. @ Revelstoke; DA =10,300; Jul 28-Jun 50

1,016.4(08ND007) Columbia R. above Nagle Cr.; DA =8,290; Jan 68-Dec 83

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-5

COLUMBIA RIVER KEENLYSIDE (ARROW) 12239500 (ARD)

river mile 780.6 Drainage Area: 14100 Sq. Mi.

Site Period Source Comments

ARD5H 07/01/28 - 09/30/37 08NE003 Observed flow of 08NE003 (Columbia River at Trail) minus observed flow of & 08NJ001 08NJ001 (Kootenay River at Glade).

10/01/37 - 05/31/44 08NE049 Observed flow of 08NE049 (Columbia River at Birchbank) minus observed flow& 08NJ001 of 08NJ001 (Kootenay River at Glade).

06/01/44 - 12/31/60 08NE049 Observed flows of 08NE049 (Columbia River at Birchbank) minus observed flow& 08NJ158 of 08NJ158 (Slocan River near Crescent Valley).

01/01/61 - 09/30/08 BCHydro Used BCHydro furnished revised project discharges. BCHydro provided a set of ARD discharges for this time frame during the 2000 study. This data was not included in the 2000 study but is included in this study.

UPA5S 07/01/28 - 06/30/68 08NE045 Used lake elevations for 08NE045 (Upper Lake at Nakusp) and UPAOLD.CAPType 4 capacity table to compute change-of-content.

07/01/68 - 05/09/72 BCHydro Used reservoir elevation data from BCHydro arrow.xls spreadsheet (Column CUpper Lake Level) and UPAOLD.CAP Type 4 storage elevation relationship.

05/10/72 - 09/30/08 BCHydro Used reservoir storage data from BCHydro.

LOA5S 07/01/28 - 06/30/68 08NE046 Used lake elevations for 08NE046 (Lower Lake at Needles) and LOAOLD.CAPType 4 capacity table to compute change-of-content.

07/01/68 - 12/31/84 BCHydro Used reservoir elevation data from BCHydro arrow.xls spreadsheet (Column DLower Lake Level) and LOAOLD.CAP Type 4 storage elevation relationship.

01/01/85 - 09/30/08 BCHydro Used reservoir storage data from BCHydro.

ARD5A 07/01/28 - 12/31/69 SSARR SSARR routings were used to compute local inflows and unregulated flow.

01/01/70 - 09/30/08 BC Hydro Used BCHydro inflow data. Inflow to ARD plus inflow to WGS. WGS inflow data from 01/01/1970 to 12/31/1973 was missing so the daily averages from the WGS inflow data from 01/01/1974 to 09/30/2008 was used.

Arrow Lakes

Hugh Keenleyside Dam; DA=14,100

780.6

762.4

755.6

774.1

Columbia River

Kootenay River

(08NJ158) Kootenay Lake outflow nr Corra Linn; DA =17,600; Jun 44-Dec 60

(08NJ001) Kootenay R. @ Glade; DA =19,100; Jul 28-May 44

(08NE049) Columbia R. @ Birchbank; DA =34,000; Oct 37-Dec 60

(08NE003) Columbia R. @ Trail; DA =34,000; Jul 28-Sep 37

8.2

16.1

(08NE046) Upper Arrow Lake @ Nakusp;Jul 28-Jun 68

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-6

KOOTENAI RIVERLIBBY 12301921 (LIB)

river mile 221.7 Drainage Area: 8985 Sq. Mi.

Site Period Source Comments

LIB5H 07/01/28 - 09/30/30 USGS 12303000 Observed flow of 12303000 (Kootenai River at Libby) multiplied by a respective monthly& Monthly Factor weighting factor to adjust for the local inflow between Libby project and 1203000.

Jan. .89; Feb.88; Mar. .85; Apr. .84; May .92; Jun. .96; Jul. .97; Aug. .97; Sep. .96;Oct. .95; Nov. .92; Dec. .89

10/01/30 - 06/30/61 USGS 12303000 Observed flow of 08NG042 (Kootenay River at Newgate) plus .5136 times the ungaged & 08NG042 flow between 08NG042 and 12303000 (Kootenai River at Libby) gages.

07/01/61 - 09/30/71 USGS 12303000 Observed flow of 12301850 (Kootenay River at Warland Bridge) plus .069 times the & 12301850 ungaged flow between the Warland Bridge (12301850) and Libby (12303000) gages.

10/01/71 - 09/30/99 USGS 12301933 Observed flow of 12301933 (Kootenai River below Libby Dam) near Libby.

10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

LIB5S 10/01/72 - 09/30/99 USGS 12301920 Reservoir elevations USGS 12301920 (Lake KOOCANUSA Near Libby) and LIB.CAP .capacity table

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery

LIB5A 07/01/28 - 09/30/08 LIB_H + LIB_S

272.1

Libby Dam; DA=8,985

(08NG042) Kootenay R. @ Newgate; DA =7,660; Oct 30-Mar 72

Kootenai River

Fisher River

Int’lBdy

228.6

221.7

221.0

218.2

211.9

204.3

0.8

(12301850) Kootenai R. @ Warland Bridge; DA =8,892; Jul 61-Sep 71

(12301933) Kootenai R. bl Libby Dam nr Libby; DA =8,985; Oct 71-Sep 08

(12302055) Fisher R. nr Libby; DA =838; Sep 67-Sep 08

(12303000) Kootenai R. @ Libby; DA =10,240; Jul 28-Sep 91

Libby Rereg Dam; DA=9,900

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-7

KOOTENAI RIVERBONNERS FERRY 12309501 (BFE)

river mile 152.8 Drainage Area: 12690 Sq. Mi.

Site Period Source Formula

BFE5H 07/01/28 - 09/30/60 USGS 12309500 Observed flows of 12309500 (Kootenai River at Bonners Ferry).

10/01/60 - 09/30/99 USGS 12305000 Observed flows of USGS 12305000 (Kootenai River at Leonia) routed by SSARR USGS 12306500 to Leonia plus the estimated local flow between Leonia and Bonners Ferry

computed as shown in the table below.

10/01/99 - 09/30/08 Calculated Calculated as LIB5H routed to BFE plus the local flow between LIB and BFE.The local flow between LIB and BFE = local flow between LIB and Leonia routed to BFE, plus the local flow between Leonia and BFE which is calculated asshown in the table below.

Local inflow between Bonners Ferry and Leonia = USGS 12306500*a + bwhere USGS 12306500 = Moyie River @ Eastport, ID Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.387 1.67 1.518 1.787 2.093 1.505 1.396 1.301 1.414 2.114 1.662 1.347b 57.38 27.09 77.85 31.66 -13.2 80.38 166.5 248.2 350.3 75.54 34.41 32.45

BFE5ARF 07/01/28 - 09/30/60 USGS 12309500 Observed flow of USGS 12309500 (Kootenai River at Bonners Ferry)

10/01/60 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

152.8(12309500) Kootenai R. @ Bonners Ferry; DA =12,690; Jul 28-Sep 60

Kootenai River

Moyie River

171.6

(12306500) Moyie R. @ Eastport, ID; DA =570; Aug 29-Sep 99

(12305000) Kootenai R. @ Leonia; DA =11,740; Oct 29-Sep 99

Libby Dam; DA=8,985221.7

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-8

DUNCAN RIVERDUNCAN 12322405 (DCD)

river mile 8.3 Drainage Area: 942 Sq. Mi.

Site Period Source Comments

DCD5H 07/01/28 - 06/30/34 1990 modified flow study Used monthly values from 1990 modified flow study for volume and used 08NJ013 (Slocan River near Crescent Valley) for shape to compute daily Duncan outflows.

07/01/34 - 04/30/67 08NH001 & 08NH003 Used 08NH001 (Duncan River near Howser) plus 08NH003 (Glacier Cr. Near Howser).

05/01/67 - 12/31/83 BCHydro Project discharges provided by BCHydro

01/01/84 - 09/30/08 BCHydro or 08NH126 The data from the following sources that were the best fit were used: DCD5H, DCD4H, BCHydro's generator turbin discharge, or 08NH126.

DCD5S 07/01/28 - 05/31/34 1990 modified flow study No data record available for 08NH110. Monthly values contained in 1990 modified flow study were used as daily values.

06/01/34 - 04/30/67 08NH110 Used 08NH110 (Duncan Lake @ Howser) reservoir elevations and DCD.CAP capacity table to compute change of contents.

05/01/67 - 09/30/08 Project storage data provided by BCHydro

DCD5A 07/01/28 - 04/30/67 DCD_H + DCD_S

05/01/67 - 09/30/08 BCHydro Quality controlled inflow provided by BCHydro

(08NH110) Duncan Lake @ Howser; DA =833; Jun 34-Apr 67

Duncan Dam; DA=942

Kootenay River

774.1

Columbia River

Slocan River

Kootenay River

Glacier Creek

Kootenay Lake

Duncan River

(08NH001) Duncan River nr Howser; DA =833; Jul 34-Apr 67

(08NH003) Glacier Cr nr Howser; DA =109; Jul 34-Apr 67

10.3

10.61

9.7

1.4

8.3

774.1

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-9

CORRA LINN 12322730 (COR)KOOTENAY RIVER river mile 16.1 Drainage Area: 17700 Sq. Mi.Site Period Source Comments

COR5H 07/01/28 - 09/30/37 08NJ009 Used observed flow of 08NJ009 Kootenay River at Nelson.

10/01/37 - 09/30/08 08NJ158 Used observed flow of 08NJ158 Kootenay Lake Outflow nr Corra Linn

COR5S 07/01/28 - 09/30/28 SSARR model Used lake elevations derived by SSARR model and capacity table COROLD.CAP

10/01/28 - 09/30/99 USACE Dataquery from USACE database Koot.dss //CORB/ELEV/01JAN1928/1DAY/AMENDED/and capacity table COROLD.CAP 10/1/28-9/30/68 and capacity table COR.CAP 10/1/68-9/30/99

10/01/99 - 09/30/08 08NH064 Used lake elevations from 08NH064 Kootenay Lake @ Queens Bay (from the Water Survery of Canada) and capacity table COROLD.CAP

COR5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

COR5A 01/01/85 - 09/30/08 COR_H + COR_A

Kootenay River

774.1

Columbia River

Brilliant

Kootenay RiverKootenay Lake

26.51.9

Duncan River

10.313.4 14.3 14.8 16.1

Slocan River

S. Slocan

Lower Bonnington

Upper Bonnington &

Bonnington FallsCorra Linn & Kootenay Canal

(08NH064) Kootenay Lake @ Queens Bay; Oct 99 - Sep 08

(08NJ158) Kootenay Lake Outflow nr Corra Linn; DA =17,600; Oct 37-Sep 08

(08NJ009) Kootenay R. @ Nelson; DA =17,500; Jul 28-Sep 37

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-10

KOOTENAY RIVERSLOCAN BASIN 12322970 (BRI)

river mile 1.9 Drainage Area: 19300 Sq. Mi.

Site Period Source Comments

BRI5H 07/01/28 - 05/31/44 08NJ001 Observed flow of 08NJ001 Kootenay River nr Glade

06/01/44 - 09/30/08 08NJ158 & Observed flow of 08NJ158 Kootenay Lake outflow near Corra Linn plus 08NJ013 observed flow of 08NJ013 Slocan River near Crescent Valley.

Observed flows adjusted as required to obtain realistic local inflows

BRI5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Kootenay River

774.1

Columbia River

Brilliant

Kootenay RiverKootenay Lake

(08NJ013) Slocan R. nr Crescent Valley; DA =1,270; Jun 44-Sep 08

1.9

Duncan River

8.210.3

13.4 14.3 14.8 16.1

4.4

Slocan River

S. Slocan

Lower Bonnington

Upper Bonnington &

Bonnington FallsCorra Linn & Kootenay Canal

(08NJ001) Kootenay R. nr Glade; DA =19,100; Jul 28-May 44

(08NJ158) Kootenay Lake Outflow nr Corra Linn; DA =17,600; Jun 44 – Sep 08

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-11

COLUMBIA RIVERMURPHY CREEK 12323040 (MUC)

river mile 759 Drainage Area: 34000 Sq. Mi.

Site Period Source Formula

MUC5H 07/01/28 - 09/30/37 08NE003 Observed flow of 08NE003 Columbia River at Trail

10/01/37 - 09/30/08 08NE049 Observed flow of 08NE049 Columbia River at Birchbank

MUC5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

774.1

Columbia River

(08NE049) Columbia R. @ Birchbank; DA =34,000; Oct 37-Dec 08

Kootenay River

Murphy Creek Dam; DA =34,000

(08NE003) Columbia R. @ Trail; DA =34,000; Jul 28-Sep 37

762.4

759.0

755.6

Upper Columbia and Kootenay Basins (Section 3.1)

Page B-12

SF FLATHEAD RIVERHUNGRY HORSE 12362001 (HGH)

river mile 5.2 Drainage Area: 1654 Sq. Mi.

Site Period Source Comments

HGH5H 07/01/28 - 9/30/08 USGS 12362500 Observed flows of 12362500 SF Flathead River near Columbia Falls.

HGH5S 09/21/51 - 09/30/08 USGS 12362000 Observed USGS 12362000 reservoir elevations and Capacity Table HGH.CAP.

HGH5A 07/01/28 - 09/30/08 HGH_H + HGH_S Some revision of outflow and reservoir change of content required to obtain realistic Hungry Horse inflows

143.0S.F. Flathead River

Flathead River

Hungry Horse Dam; DA =1,654

3.5 5.2

(12362500) S. F. Flathead R. nr Columbia Falls; DA =1,663; Jul 28-Sep 08

(12363000) Flathead R. @ Columbia Falls; DA =4,464; Jul 28-Sep 08

Pend Oreille and Spokane Basins (Section 3.2)

Page B-13

FLATHEAD RIVERCOLUMBIA FALLS 12363000 (CFM)

river mile 143 Drainage Area: 4464 Sq. Mi.

Site Period Source Comments

CFM5H 07/01/28 - 09/30/08 USGS 12363000 Observed flow of 12363000 Flathead River at Columbia Falls

CFM5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

143.0S.F. Flathead River

Flathead River

Hungry Horse Dam; DA =1,654

3.5 5.2

(12362500) S. F. Flathead R. nr Columbia Falls; DA =1,663; Jul 28-Sep 08

(12363000) Flathead R. @ Columbia Falls; DA =4,464; Jul 28-Sep 08

Pend Oreille and Spokane Basins (Section 3.2)

Page B-14

FLATHEAD RIVERKERR (FLATHEAD LAKE) 12371800 (KER)

river mile 72 Drainage Area: 7086 Sq. Mi.

Site Period Source Comments

KER5H 07/01/28 - 09/30/08 USGS 12372000 Observed flow of 12372000 Flathead River near Polson

KER5S 07/01/28 - 11/30/28 USGS 12371550 Observed lake elevations and capacity table KER.CAP

12/01/28 - 01/31/29 USACE Dataquery Corps data base elevations and capacity table KER.CAP

02/28/29 - 09/30/99 USGS 12371550 Observed lake elevations and capacity table KER.CAP

07/01/28 - 09/30/99 Some revision of reservoir elevations and change ofcontent required to obtain realistic Flathead Lake daily inflow

10/01/99 - 09/30/08 USACE Dataquery Corps database elevations and capacity table KER.CAP

KER5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Flathead River

Kerr Dam; DA =7,08672.0

71.5 (12372000) Flathead R. nr Polson; DA =7,096; Jul 28-Sep 08

Pend Oreille and Spokane Basins (Section 3.2)

Page B-15

CLARK FORK RIVERTHOMPSON FALLS 12390001 (TOM)

river mile 208 Drainage Area: 20968 Sq. Mi.

Site Period Source Comments

TOM5H 07/01/28 - 09/30/51 USGS 12389000 (USGS 12389000 plus KER4SS)*1.0405 minus KER4SS10/01/51 - 09/30/59 USGS 12391000 Observed flow of 12391000 Clark Fork at Thompson Falls10/01/59 - 09/30/99 USGS 12389000 (USGS 12389000 plus KER4SS)*1.0405 minus KER4SS

10/01/99 - 09/30/08 PPL Montana

TOM5S 10/01/99 - 09/30/08 PPL Montana

TOM5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

1.0405 factor was based on ratio of volumetric adjusted runoff past the Plains and Thompson Falls gages during the concurrent period of record.

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Clark Fork

Thompson Falls Dam; DA =20,968

239.0

207.3(12391000) Clark Fork @ Thompson Falls; DA =21,113; Oct 51-Sep 59

(12389000) Clark Fork nr Plains; DA =19,958; Jul 28-Sep 08

208.0

Pend Oreille and Spokane Basins (Section 3.2)

Page B-16

CLARK FORK RIVERNOXON RAPIDS 12391301 (NOX)

river mile 169.7 Drainage Area: 21833 Sq. Mi.

Site Period Source Comments

NOX5H 07/01/28 - 09/30/28 USGS 12395500 Used 1990 monthly flow volume shaped to USGS 12395500(PendOreille River at Newport).

10/01/28 - 05/31/60 USGS 12392000 Used 1990 monthly flow volume shaped to USGS 12392000(Clark Fork at Whitehorse Rapids).

06/01/60 - 09/30/08 USGS 12391400 Used observed flow of 12391400 (Clark Fork below Noxon Rapids Dam).

NOX5S 04/01/59 - 09/30/99 USACE & Avista Reservoir elevation data obtained from Avista and USACE data bases data bases and capacity table NOX.CAP.

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevation data obtained from USACE database and capacity table NOX.CAP

NOX5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Clark Fork

Cabinet Gorge Dam; DA =22,073

169.7

146.9(12392000) Clark Fork @ Whitehorse Rapids; DA =22,073; Oct 28-Sep 08

(12391400) Clark Fork bl Noxon Rapids Dam; DA =21,833; Jul 60-Sep 08

149.9

Noxon Rapids Dam; DA =21,833169.7

Pend Oreille and Spokane Basins (Section 3.2)

Page B-17

CLARK FORK RIVERCABINET GORGE 12391900 (CAB)

river mile 149.9 Drainage Area: 22067 Sq. Mi.

Site Period Source Comments

CAB5H 07/01/28 - 09/30/28 USGS 12389000 Correlation (USGS12392000)=a(USGS12389000)(Clark Fk nr Plains) + b minus 800 cfs. a and b are shown below.

10/01/28 - 09/30/08 USGS 12392000 Observed flow of 12392000 Clark Fork at Whitehorse Rapids minus 800 cfs to account for ground water inflowbetween stream gage and project site.

Jul Aug Sepslope a 1.105 1.075 1.082

intercept b 492 683 118

CAB5S 08/10/52 - 09/30/99 USACE database //CAB / DELTA-FLOW / 01JAN1952 to 01JAN1999 / 1DAY / OBS/Pendo.dss

10/01/99 - 09/30/08 AVISTA Obtained storage measurements from AVISTA

CAB5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Clark Fork

Cabinet Gorge Dam; DA =22,073

169.7

146.9(12392000) Clark Fork @ Whitehorse Rapids; DA =22,073; Oct 28-Sep 08

(12391400) Clark Fork bl Noxon Rapids Dam; DA =21,833; Jul 60-Sep 08

149.9

Noxon Rapids Dam; DA =21,833169.7

Pend Oreille and Spokane Basins (Section 3.2)

Page B-18

PRIEST RIVERPRIEST LAKE 12393560 (PSL)

river mile 43.2 Drainage Area: 572 Sq. Mi.

Site Period Source Comments

PSL5H 07/01/28 - 09/30/48 USGS 12393500 Observed flow of 12393500 (Priest R at outlet of Priest Lake near Coolin).

10/01/48 - 09/30/06 USGS 12394000 & Observed flow of 12394000 (Priest River near Coolin) minus 0.134 timesUSGS 12395000 [(12394000 (Priest R near Coolin) minus 12395000 (Priest R near Priest R)]

PSL5S 07/01/28 - 09/30/39 USGS 12393000 Data not available in electronic form so USGS reservoir elevation data paper records were scanned and capacity table PSL.CAP wasused to obtain daily change of content.

10/01/39 - 09/30/08 USGS 12393000 Observed USGS electronic resrvoir elevation data and capacity table PSL.CAP was used to obtain daily change of content data.

PSL5A 07/01/28 - 09/30/06 PSL_H + PSL_S PSL_S was revised to smooth project inflow and eliminate negatives.

10/01/06 - 09/30/08 a linear relationship between gage 12395000 and calculated PSL inflows was developed to produce a synthetic inflow at PSL

Priest River

Priest Lake Dam; DA =572

43.9

3.8(12395000) Priest River nr Priest River; DA =902; Oct 29-Sep 08

(12393500) Priest River @ Outlet of Priest Lake nr Coolin; DA =572; Sep 28-Sep 48

43.2

(12394000) Priest River nr Coolin; DA =611; Oct 48-Sep 0638.8

Priest Lake

Pend Oreille and Spokane Basins (Section 3.2)

Page B-19

PEND O'REILLE RIVERALBENI FALLS 12395400 (ALF)

river mile 90.1 Drainage Area: 24200 Sq. Mi.

Site Period Source Comments

ALF5H 07/01/28 - 09/30/28 USGS 12398500 1990 modified flow study monthly values shaped to 12398500to obtain daily values

10/01/28 - 09/30/41 USGS 12395500 Observed flow of 12395500 (Pend Oreille River at Newport).

10/01/41 - 09/30/52 USACE Dataquery Project discharges determined by SSARR model regulation using Pendo.dss Hope reservoir gage.

10/01/52 - 09/30/08 USGS 12395500 Observed flow of 12395500 (Pend Oreille River at Newport).

ALF5S 07/01/28 - 09/30/29 USGS 12392500 Data not available in electronic form so USGS reservoir elevation data paper records were scanned and capacity table ALF.CAP was used to obtain daily change of content.

10/01/29 - 09/30/08 USGS 12392500 Reservoir elevation data and capacity table ALF.CAP was used toobtain daily change of content.

data missing from 12/01/39-1/31/40 & 4/01/45-4/31/45 and was obtained from USACE Pendo.dss //ALF/ELEV/01JANXXXX/1DAY/AMENDED/

ALF5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Pend Oreille River

Albeni Falls Dam; DA =24,200

17.3(12398500) Pend Oreille R. bl Z Canyon nr Metaline Falls; DA =25,200; Jul 28-Sep 64

90.1

(12395500) Pend Oreille River @ Newport; DA =24,200; Oct 28-Sep 41; Oct 52-Sep 0888.5

Pend Oreille Lake

Box Canyon Dam; DA =24,90034.5

(12396500) Pend Oreille R. bl Box Canyon nr Ione; DA =24,900; Oct 52-Sep 0834.3

Pend Oreille and Spokane Basins (Section 3.2)

Page B-20

PEND O'REILLE RIVERBOX CANYON 12396485 (BOX)

river mile 34.5 Drainage Area: 24900 Sq. Mi.

Site Period Source Comments

BOX5H 07/01/28 - 09/30/28 USGS 12395500 & Average of 12398500 (observed flow of PendOreille River USGS 12398500 below Z Canyon) and 12395500 (Pend Oreille River at Newport).

Q(12395500) = a*(Q12398500)+b

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Deca 0.928 0.923 0.914 0.951 0.964 0.983 0.916 0.924 1.006 0.951 0.947 0.931b 124 80 253 -494 340 -1889 184 90 - 514 115 120 115

10/01/28 - 09/30/41 USGS 12395500 & Average of 12398500 (observed flow of PendOreille River USGS 12398500 below Z Canyon) and 12395500 (Pend Oreille River at Newport).

10/01/41 - 09/30/52 USGS 12395500 & Average of 12398500 (observed flow of PendOreille River USGS 12398500 below Z Canyon) and 12395500 (Pend Oreille River at Newport).

Q(12395500) = a*(Q12398500)+b

10/01/52 - 09/30/99 USGS 12396500 Observed flow of 12396500 (Pend Oreille R below Box Canyon)

10/01/99 - 09/30/08 Not used Refer to Section 3.2.3

BOX5S 10/01/99 - 09/30/08 USACE Dataquery Storage data was available and corrected via indexing.

BOX5F 06/11/55 - 06/12/55 Initial fill of Box Canyon

BOX5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Pend Oreille River

Box Canyon Dam; DA =24,900

17.3(12398500) Pend Oreille R. bl Z Canyon nr Metaline Falls; DA =25,200; Jul 28-Sep 64

34.5

(12396500) Pend Oreille R. bl Box Canyon nr Ione; DA =24,900; Oct 52-Sep 0834.3

(12395500) Pend Oreille River @ Newport; DA =24,200; Oct 28-Sep 41; Oct 52-Sep 08

88.5

Pend Oreille and Spokane Basins (Section 3.2)

Page B-21

PEND O'REILLE RIVERBOUNDARY 12398555 (BDY)

river mile 17 Drainage Area: 25200 Sq. Mi.

Site Period Source Comments

BDY5H 07/01/28 - 09/30/64 USGS 12398500 Observed flows of 12398500 (Pend Oreille R below Z Canyon near Metaline Falls

10/01/64 - 09/30/95 USGS 12398600 Observed flows of 12398600 (Pend Oreille R atInternational Boundary)

10/01/95 - 09/30/96 USGS 12396500 Correlation BDY4H = USGS 12396500 (Pend Oreille bl Box Canyon)times a +b

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.993 1.039 0.991 0.982 1.012 1.005 0.983 1.017 1.024 1.011 0.985 1.006b 485 -469 370 423 -46 267 951 371 -49 98 219 -78

10/01/96 - 09/30/08 USGS 12398600 Observed flows of 12398600 (Pend Oreille R atInternational Boundary)

BDY5S 10/01/99 - 09/30/08 USACE Dataquery Storage data was available and corrected via indexing

BDY5F 07/01/67 - 08/19/67 Boundary Initial Fill

BDY5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Pend Oreille River

Boundary Dam; DA =25,200

17.3(12398500) Pend Oreille R. bl Z Canyon nr Metaline Falls; DA =25,200; Jul 28-Sep 64

17.0

(12398600) Pend Oreille R. @ International Boundary; DA =25,200; Oct 62-Sep 95; Oct 96-Sep 0816.1

(12396500) Pend Oreille R. bl Box Canyon nr Ione; DA =24,900; Oct 52-Sep 0834.3

Pend Oreille and Spokane Basins (Section 3.2)

Page B-22

PEND O'REILLE RIVERSEVEN MILE 12399100 (SEV)

WANETA 12399350 (WAT)river mile 6

Drainage Area: 25700 Sq. Mi.

Site Period Source Comments

SEV5H 07/01/28 - 09/30/28 USGS 12398500 & Observed flow of 12398500 (Pend Oreille R below Z Canyon near metaline Falls) plus 08NE044 est. the estimated flow of Salmo River 08NE044. Jul=2124cfs, Aug=274 cfs, Sep = 267 cfs.

10/01/28 - 03/30/36 USGS 12398500 & Observed flow of 12398500 (Pend Oreille R below Z Canyon near metaline Falls) plus 08NE044 est. the estimated flow of Salmo River. Q1 (08NE044) = Q2(12401500)*a + bUSGS 12401500 USGS # 12401500 is the Kettle River near Ferry Washington

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DECb 112.508 38.750 183.230 848.033 1187.346 61.529 219.697 149.994 133.803 121.104 144.776 62.015a 0.807 1.186 0.793 0.391 0.444 0.625 0.511 0.400 0.386 0.517 0.762 1.162

04/01/36 - 09/30/46 USGS 12398500 & Observed flow of 12398500 (Pend Oreille R below Z Canyon near metaline Falls) 08NE044 plus observed flow of 08NE044 (Salmo River near Waneta)

10/01/46 - 02/28/49 USGS 12398500 & Observed flow of 12398500 (Pend Oreille R below Z Canyon near metaline Falls 08NE044 est. plus the estimated flow of Salmo River. Q1 (08NE044) = Q2(12401500)*a + bUSGS 12401500 USGS # 12401500 is the Kettle River near Ferry Washington

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DECb 112.508 38.750 183.230 848.033 1187.346 61.529 219.697 149.994 133.803 121.104 144.776 62.015a 0.807 1.186 0.793 0.391 0.444 0.625 0.511 0.400 0.386 0.517 0.762 1.162

03/01/49 - 09/30/64 USGS 12398500 & Observed flow of 12398500 (Pend Oreille R below Z Canyon near metaline Falls) 08NE074 plus observed flow of 08NE074 (Salmo River near Salmo)

10/01/64 - 09/30/95 USGS 12398600 & Observed flow of 12398600 (Pend Oreille R at International Boundary) 08NE074 plus observed flow of 08NE074 (Salmo River near Salmo)

10/01/95 - 09/30/96 08NE074 Observed flow of 08NE074 (Salmo River near Salmo)USGS 12398600 plus extended flow of 12398600 (Pend Oreille R at International Boundary)extended Q1(12398600) = Q2(12396500)*a + b

USGS # 12396500 is the Pend Oreille R below Box CanyonJAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

b 423.083 -46.203 266.613 951.424 370.973 -48.921 98.396 218.994 -77.706 485.413 -469.015 370.480a 0.982 1.012 1.005 0.983 1.017 1.024 1.011 0.985 1.006 0.993 1.039 0.991

10/01/96 - 09/30/99 USGS 12398600 & Observed flow of 12398600 (Pend Oreille R at International Boundary) 08NE074 plus observed flow of 08NE074 (Salmo River near Salmo)

10/01/99 - 09/30/08 USGS 12398600 & Observed flow of 12398600 (Pend Oreille R at International Boundary) 08NE074 plus observed flow of 08NE074 (Salmo River near Salmo) minus change in storage data

from BCHydro

SEV5S 12/11/79 - 09/30/08 BCHydro BCHydro provided Seven Mile reservoir elevations and storage capacity formula

SEV5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model; local inflow between Boundary and Seven Mile provided by BCHydro for 1/01/80-09/30/99 period.

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

5.3

Pend Oreille River

(12398600) Pend Oreille R. @ Int’lBoundary; DA =25,200; Dec 62-Sep 08

Salmo River

Waneta Dam; DA =25,800

(08NE074) Salmo R. nr Salmo; DA =476; Mar 49-Sep 08

0.5

0.5 6.0

Seven Mile Dam; DA =25,700

(08NE044) Salmo R. nr Waneta; DA =500; Apr 36-Sep 46

(12398500) Pend Oreille R. bl Z Canyon nr Metaline; DA =25,200;Jul 28-Sep 64

16.0

16.1 17.313.3

International Boundary

Pend Oreille and Spokane Basins (Section 3.2)

Page B-23

SPOKANE RIVERCOEUR D'ALENE 12418900 (COE)

POST FALLS (PFL)river mile 102.1

Drainage Area: 3840 Sq. Mi.

Site Period Source Comments

COE5H 07/01/28 - 09/30/08 USGS 12419000 Observed flow of 12419000 (Spokane River near Post Falls)

COE5S 07/01/28 - 09/30/66 USGS 1215500 Observed USGS 1215500 reservoir elevations and capacity table COE.CAP

10/01/66 - 09/30/08 USGS 1215500 Observed USGS 1215500 stage elevations. Added 2100 feet to stage elev's and used capacity table COE.CAP.

COE5A 07/01/28 - 09/30/08 COE_H + COE_S

Spokane River

Post Falls Dam; DA =3,840

102.1

(12491000) Spokane River nr Post Falls; DA =3,840; Jul 28-Sep 08

100.7

Coeur d’Alene Lake

Pend Oreille and Spokane Basins (Section 3.2)

Page B-24

SPOKANE RIVERSPOKANE RIVER

UPPER FALLS 12422150 (UPF)MONROE STREET 12422280 (MON)

river mile 76.2river mile 74.2

Drainage Area: 4290 Sq. Mi.Drainage Area: 4290 Sq. Mi.

Site Period Source Comments

UPF5H 07/01/28 - 09/30/08 USGS 12422500 Observed flow of 12422500 Spokane River at Spokane

UPF5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Spokane River

Upper Falls Dam; DA =4,29076.2

(12422500) Spokane River @ Spokane; DA =4,290; Jul 28-Sep 0872.9

Monroe Street Dam; DA =4,29074.2

Pend Oreille and Spokane Basins (Section 3.2)

Page B-25

SPOKANE RIVERNINE MILE 12425950 (NIN)

river mile 58.1 Drainage Area: 5204 Sq. Mi.

Site Period Source Comments

NIN5H 07/01/28 - 02/28/48 USGS 12422500 Average of 12422500 (Spokane River at Spokane) and 12433000(Spokane USGS 12433000 River at Long Lake) plus change of content of Long LakeLong Lake change of content

03/01/48 - 09/30/50 USGS 12426000 Observed flow of 1242600 (Spokane R. below Nine Mile Dam, near Spokane).

10/01/50 - 09/30/52 USGS 12424500 Observed flow of 12424500 (Spokane R. above Seven Mile Bridge, near Spokane).

10/01/52 - 09/30/08 USGS 12422500 Average of 12422500 (Spokane River at Spokane) and 12433000(Spokane USGS 12433000 River at Long Lake) plus change of content of Long LakeLong Lake change {UPF-H + (LLK-H + LLKS)} / 2of content

LLK5S 07/01/28 - 09/30/77 1990 modified Semi-monthly values used as daily values because daily data was not availableflow study

10/01/77 - 09/30/08 USGS 12432500 Reservoir elevations USGS 12432500 and capacity table LLK.CAP

NIN5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Spokane River

Nine Mile Dam; DA =5,204

72.9

(12426000) Spokane R. bl Nine Mile Dam, nr Spokane; DA =5,200; Mar 48-Sep 50

58.1

Long Lake Dam; DA =6,020

64.2

(12422500) Spokane R. @ Spokane; DA =4,290; Jul 28-Sep 08

(12424500) Spokane R. ab Seven Mile Bridge, nr Spokane; DA =5,020; Nov 48-Sep 52

57.6

33.9

(12433000) Spokane River at Long Lake; DA =6,020; Apr 39-Sep 08

33.9

Pend Oreille and Spokane Basins (Section 3.2)

Page B-26

SPOKANE RIVER SPOKANE RIVER

LONG LAKE 12432510 (LLK)LITTLE FALLS 12433475 (LFL)

river mile 33.9river mile 29.3

Drainage Area: 6020 Sq. Mi.Drainage Area: 6283 Sq. Mi.

Site Period Source Comments

LLK5H 07/01/28 - 09/30/29 USGS 12433500 Observed flow of 12433500 (Spokane River below Little Falls, near Long Lake)scanned from paper records since electronic data not available

10/31/29 - 03/30/39 USGS 12433500 Observed flow of 12433500 (Spokane River below Little Falls, near Long Lake)

04/01/39 - 09/30/08 USGS 12433000 Observed flow of 12433000 (Spokane River at Long Lake)

LLK5S 07/01/28 - 09/30/77 1990 modified flow stuUsed bi-monthly values from 1990 modified flow study because daily reservoirelevations were not available.

10/01/77 - 09/30/08 USGS 12432500 Observed daily reservoir elevations and capacity table LLK.CAP

LLK5A 07/01/28 - 09/30/08 LLK_H + LLK_S

LLK5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Spokane River

Lone Lake Dam; DA =6,020

(12433000) Spokane River at Long Lake; DA =6,020; Apr 39-Sep 08

33.9

Little Falls Dam; DA =6,283

(12433500) Spokane River bl Little Falls nr Long Lake; DA =6,340; Oct 29-Sep 40

33.9

29.3

27.5

Pend Oreille and Spokane Basins (Section 3.2)

Page B-27

COLUMBIA RIVERGRAND COULEE 12436100 (GCL)

river mile 596.6 Drainage Area: 74700 Sq. Mi.

Site Period Source Comments

GCL5H 07/01/28 - 09/30/28 1990 mod. flow study 1990 modified flow study monthly values shaped to USGS 12472800 daily flows of USGS 12472800 (Columbia R below

Priest Rapids Dam).

10/01/28 - 09/30/29 USACE mcol.dss Daily values obtained from USACE mcol.dss amendeddatabase data base

10/01/29 - 09/30/08 USGS 12436500 Observed flow of 12436500 (Columbia River at Grand Coulee dam)

GCL5S 05/01/38 - 09/30/52 USGS 12436000 Observed USGS daily reservoir elevations and capacity table GCLOLD.CAP.

10/01/52 - 09/30/74 USGS 12436000 Observed USGS daily reservoir elevations and capacity table FDROLD.CAP.

10/01/74 - 09/30/99 USGS 12436000 Observed USGS daily reservoir elevations and capacity table FDR.CAP.

10/01/99 - 09/30/08 USGS 12436000 Observed USGS daily reservoir elevations and capacity table GCL.CAP.

GCL5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Grand Coulee Dam; DA =74,700

596.6

(12436500) Columbia R. @ Grand Coulee Dam; DA =74,700; Jul 28-Sep 08

596.3

Mid-Columbia Basin (Section 3.3)

Page B-28

COLUMBIA RIVERGRAND COULEE PUMP and GENERATION (FDR)

river mile 596.6 Drainage Area: 74700 Sq. Mi.

Site Period Source Comments

FDR5P 05/01/51 - 04/30/52 Prior Mod Flow Monthly values from 1980 &1990 modified flow studiesStudies

05/01/52 - 09/30/08 USGS 12435500 Observed positive flow of USGS 12435500 (Feeder Canal at Grand Coulee, WA)

FDR5G 05/0152 - 09/30/08 USGS 12435500 Observed negative flow of USGS 12435500 (Feeder Canal at Grand Coulee, WA)

Columbia River

Grand Coulee Dam; DA =74,700

596.6

(12436500) Columbia R. @ Grand Coulee Dam; DA =74,700; Jul 28-Sep 08

596.3

Banks Lake

PG

FDR5P is water pumped up to Banks LakeFDR5G is water returned from Banks Lake

(12435500) Feeder Canal at Grand Coulee, WA; May 52-Sep 08

Mid-Columbia Basin (Section 3.3)

Page B-29

COLUMBIA RIVERCHIEF JOSEPH 12437990 (CHJ)

river mile 545.1 Drainage Area: 75400 Sq. Mi.

Site Period Source Comments

CHJ5H 07/01/28 - 03/31/52 USGS 12436500 Observed flow of 12436500 (Columbia River at Grand Coulee Dam).

04/01/52 - 09/30/08 USGS 12438000 Observed flow of 12438000 (Columbia River at Bridgeport).

CHJ5HR 07/01/28 - 03/31/52 USGS 12436500 Observed flow of 12436500 (Columbia River at Grand Coulee Dam) routed by (SSARR) to CHJ.

CHJ5S 11/01/54 - 07/31/60 1990 modified Daily change of content not available. Used flow study 1990 modified flow study monthly values for

daily change of content.

08/01/60 - 09/30/99 USACE mcol.dss Elevation data from USACE database mcol.dss

10/01/99 - 09/30/08 USACE Dataquery Storage (kaf) data from USACE Dataquery

CHJ5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Chief Joseph Dam; DA =75,400

545.1

(12438000) Columbia R. @ Bridgeport; DA =75,700; Apr 52-Sep 08

544.0

(12436500) Columbia R. @ Grand Coulee Dam; DA =74,700; Jul 28-Sep 08

596.3

Mid-Columbia Basin (Section 3.3)

Page B-30

COLUMBIA RIVERWELLS 12450652 (WEL)

river mile 515.9 Drainage Area: 86100 Sq. Mi.

Site Period Source Comments

WEL5H 07/01/28 - 03/31/52 GCL4H & USGS 12464500 Observed flow of Columbia R at Grand Coulee Dam (Columbia R @ Trinidad) plus .38 times the difference between Columbia R

at Grand Coulee and the Columbia River at Trinidad.

04/30/52 - 09/30/59 USGS 12438000 & Observed flow of USGS 12438000 Columbia R USGS 12464500 at Bridgeport plus .32 times the difference between

the Columbia R. at Bridgeport and the Columbia R at Trinidad.

10/01/59 - 09/30/08 Calculated (CHJ5H rt to WEL) + WEL5L - WEL5S

WEL5S 05/01/67 - 09/30/08 USACE mcol.dss Elevation data from USACE data base mcol.dss

WEL5L 07/01/28 - 09/30/59 SSARR Model Local flows derived by SSARR model

10/01/59 - 11/30/65 USGS 12447300 Local flows calculated as sum of major sidestreams -USGS 12449950 12447300 (Okanogan R nr Malott) plus 12449950

(Methow R nr Pateros).

12/01/65 - 09/30/08 USGS 12447200 Local flows calculated as sum of sidestreams:USGS 12449950 12447200 (Okanogan R @ Malott) plus 12449950

(Methow R nr Pateros).

WEL5ARF 07/01/28 - 09/30/59 SSARR Model Unregulated flows derived by SSARR model

10/01/59 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Wells Dam; DA =86,100515.9

515.9

(12436500) Columbia R. @ Grand Coulee Dam; DA =74,700; Jul 28-Sep 08596.3

544.0(12438000) Columbia R. @ Bridgeport; DA =75,700; Aug 52-Sep 08

(12450700) Columbia R. bl Wells Dam; DA =86,100; Oct 67-Sep 08

Okanogan R.

Methow R.

Chelan R.

Entiat R.

17.0

(12447200) Okanogan R. @ Malott; DA =8,080; Dec 65-Sep 08

6.7

(12449950) Methow R. nr Pateros; DA =1,772; Apr 59-Sep 08

(12447300) Okanogan R. nr Malott; DA =8,220; Apr 58-Jul 67

Mid-Columbia Basin (Section 3.3)

Page B-31

CHELAN RIVERCHELAN 12452400 (CHL)

river mile 4.3 Drainage Area: 924 Sq. Mi.

Site Period Source Comments

CHL5H 07/01/28 - 09/30/08 USGS 12452500 Observed flow of 12452500 (Chelan River at Chelan)

CHL5S 07/01/28 - 09/30/99 USGS 12452000 Observed reservoir elevation of USGS 12452000 and capacity table CHL.CAP. Some revision of lake elevations was required to eliminate negative inflows.

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery

CHL5A 07/01/28 - 09/30/08 CHL_H + CHL_S After calculated 5H + 5S, values were indexed (during then indexed 2010 level study) against flow from Stehekin River

(USGS #12451000) to make flows smoother. Indexingdone for all years going back to 1928.

Chelan River

(12452500) Chelan R. @ Chelan; DA = 924; Jul 28-Sep 08 Chelan Dam; DA =3,840

4.3

Lake Chelan

Columbia River

Mid-Columbia Basin (Section 3.3)

Page B-32

COLUMBIA RIVERROCKY REACH 12453682 (RRH)

river mile 473.9 Drainage Area: 87800 Sq. Mi.

Site Period Source Comments

RRH5H 07/01/28 - 03/31/52 USGS 12436500 Observed flow of 12436500 (Columbia River at Grand Coulee USGS 12464500 Dam) plus .63 times [12464500 (Columbia R at Trinidad)

minus 12436500].

04/01/52 - 09/30/59 USGS 12464500 & Observed flow of 12438000 (Columbia River at Bridgeport) USGS 12438000 plus .60 times [12464500 (Columbia R at Trinidad)

minus 12438000].

10/01/59 - 09/30/08 Calculated (WEL5H rt to RRH) + CHL5H + RRH5L - RRH5S

RRH5S 07/01/61 - 09/30/08 USACE mcol.dss Elevation data from USACE data base mcol.dss

RRH5L 07/01/28 - 09/30/59 SSARR Model Local flows derived by SSARR model

10/01/59 - 03/14/96 USGS 12452800 Local flows calculated as equaling the major sidestream -USGS 12452990 12452990 (Entiat R nr Entiat), but since this USGS record does

not start until Mar 96, 12452800 (Entiat R nr Ardervoir) wascorrelated to it as shown in the table below. Q(12452990) = a*Q (12452800) + b

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.074 1.079 1.280 1.127 1.151 1.433 1.408 1.276 1.172 1.039 1.117 1.324 b 35.8 39.2 22.3 43.6 51.9 46.1 52.6 29.3 -16.8 37.3 12.3 3.6

Correlation was based on concurrent flows from Mar 96 - Sep 08

03/15/96 - 09/30/08 USGS 12452990 Observed flow of 12452990 (Entiat R nr Entiat)

RRH5ARF 07/01/28 - 09/30/59 SSARR Model Unregulated flows derived by SSARR model

10/01/59 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Rocky Reach Dam; DA =87,800473.9

(12453700) Columbia R. @ Rocky Reach Dam; DA =87,800; Oct 60-Sep 08

(12464500) Columbia R. @ Trinidad; DA =89,700 Oct 30-Mar 63

473.4

441.0

Chelan R.

Entiat R.

Wenatchee R.

515.9

515.9(12450700) Columbia R. bl Wells Dam; DA =86,100; Oct 67-Sep 08

18.0

(12452800) Entiat R. nr Ardenvoir;DA =203; Sep 57-Sep 08

(12452990) Entiat R. nr Entiat;DA =419; Mar 96-Sep 08

1.4

Mid-Columbia Basin (Section 3.3)

Page B-33

COLUMBIA RIVER ROCK ISLAND 12462552 (RIS)

river mile 453.4

Drainage Area: 89400 Sq. Mi.

Site Period Source Comments

RIS5H 07/01/28 - 09/30/59 USGS 12464500 Observed flow of 12464500 (Columbia River at Trinidad).

10/01/59 - 09/30/08 Calculated (RRH5H rt to RIS) + RIS5L - RIS5S

RIS5S 08/01/60 - 09/30/08 USACE mcol.dss Elevation data from USACE database mcol.dss

RIS5L 07/01/28 - 09/30/59 SSARR Model Local flows derived by SSARR model

10/01/59 - 09/30/62 USGS 12462500 Local flows calculated as equaling the major sidestream -USGS 12459000 12462500 (Wenatchee R@ Monitor), but since this USGS record

does not start until Oct 62, 12459000 Wenatchee R. @ Peshastin) was correlated to it as shown in the table below.

Q(12462500) = a*Q (12459000) + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.026 1.094 1.104 1.102 1.134 1.153 1.078 1.126 1.096 1.044 1.041 1.072 b 15.9 -22.3 -16.9 10.0 5.2 -5.2 69.8 -414.0 -380.8 -155.9 -123.2 -84.2

Correlation was based on concurrent flows from Oct 62 - Sep 08

10/01/62 - 09/30/08 USGS 12462500 Observed flow of 12462500 (Wenatchee R. @ Monitor)

RIS5ARF 07/01/28 - 09/30/59 SSARR model Unregulated flows derived by SSARR model

10/01/59 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Rock Island Dam; DA =89,400453.4

(12462600) Columbia R. bl Rock Island Dam; DA =89,400; Oct 30-Sep 08

(12464500) Columbia R. @ Trinidad; DA =89,700 Oct 30-Mar 63

452.4

441.0

Wenatchee R.

Wanapum Dam; DA =90,700415.8

21.5

(12462500) Wenatchee R. @ Monitor; DA =1,301; Oct 62-Sep 08

7.0

(12459000) Wenatchee R. @ Peshastin; DA =1,000; Mar 29-Sep 08

Mid-Columbia Basin (Section 3.3)

Page B-34

COLUMBIA RIVER WANAPUM 12464612 (WAN)river mile 415.8

Drainage Area: 90,700 Sq. Mi.

Site Period Source Comments

WAN5H 07/01/28 - 09/30/59 USGS 12464500 Observed flow of 12464500 (Columbia River at Trinidad).

10/01/59 - 09/30/08 Calculated (RIS5H rt to WAN) - WAN5S

WAN5S 08/01/60 - 09/30/08 USACE mcol.dss Elevation data from USACE database mcol.dss

WAN5ARF 07/01/28 - 09/30/59 SSARR model Unregulated flows derived by SSARR model

10/01/59 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Rock Island Dam; DA =89,400453.4

(12462600) Columbia R. bl Rock Island Dam; DA =89,400; Oct 30-Sep 08

(12464500) Columbia R. @ Trinidad; DA =89,700 Oct 30-Mar 63

452.4

441.0

Wenatchee R.

Wanapum Dam; DA =90,700415.8

21.5

(12462500) Wenatchee R. @ Monitor; DA =1,301; Oct 62-Sep 08

7.0

(12459000) Wenatchee R. @ Peshastin; DA =1,000; Mar 29-Sep 08

Mid-Columbia Basin (Section 3.3)

Page B-35

COLUMBIA RIVERPRIEST RAPIDS 12472710 (PRD)

river mile 397.1 Drainage Area: 95500 Sq. Mi.

Site Period Source Comments

PRD5H 07/01/28 - 09/30/08 USGS 12472800 Observed flow of 12472800 (Columbia River below Priest Rapids).

PRD5S 03/01/60 - 09/30/08 USACE mcol.dss Elevation data from USACE database mcol.dss

PRD5L 07/01/28 - 09/30/59 SSARR Model Local flows derived by SSARR model

10/01/59 - 09/30/08 USGS 12472600 Local flows calculated as equaling the major sidestream -12472600 (Crab Creek nr Beverly) + Miscellaneous flows

PRD5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

Priest Rapids Dam; DA =95,500397.1

Trinidad gage location; DA =89,700

Vernita gage location; DA =96,000+

441.0

391.1

(12472800) Columbia R. bl Priest Rapids Dam; DA =96,000 Jul 28-Sep 08394.5

Crab Creek

4.5

(12472600) Crab Creek nr Beverly; DA =4,842; Feb 59-Sep 08

Mid-Columbia Basin (Section 3.3)

Page B-36

YAKIMA RIVERYAKIMA 12510500 (YAK)

river mile 29.9 Drainage Area: 5615 Sq. Mi.

Site Period Source Comments

YAK5H 07/01/28 - 01/31/33 USGS 12509500 Observed flow of USGS 12509500 (Yakima River near Prosser).

02/01/33 - 09/30/08 USGS 12510500 Observed flow of USGS 12510500 (YakimaRiver at Kiona).

Columbia River

103.7 29.9

(12509500) Yakima R. nr Prosser; DA =5,453 Jul 28-Jan 33

46.3

Yakima River

(12505000) Yakima R. nr Parker; DA =3,660 Jul 28-Sep 78

(12510500) Yakima R. @ Kiona; DA =5,615 Feb 33-Sep 08

335.2

Mid-Columbia Basin (Section 3.3)

Page B-37

SNAKE RIVERSNAKE RIVER

BROWNLEE 13289710 (BRN)OXBOW 13290049 (OXB)

river mile 285river mile 273

Drainage Area: 72590 Sq. Mi.Drainage Area: 72800 Sq. Mi.

Site Period Source Source

BRN5H 07/01/28 - 02/28/58 USGS 13290000 Observed flow of 13290000 (Snake River at Oxbow)

03/01/58 - 09/30/67 USGS 13290200 & Observed flow of 13290200 (Snake River below Pine ext. flow 13290190 Cr. At Oxbow) minus 1.52*times the extended flow of

13290190 (Pine Cr. Nr Oxbow).

10/01/67 - 09/30/71 USGS 13290000 Observed flow of 13290000 (Snake River at Oxbow)

10/01/71 - 06/30/96 USGS 13290450 Observed flow of 13290450 (Snake River at Hells & 13290190 Canyon Dam) minus 2.17*times the observed flow

of 13290190 (Pine Cr. Nr. Oxbow).

07/01/96 - 09/30/99 USGS 13290450 & Observed flow of 13290450 (Snake River at Hells ext. flow 13290190 Canyon Dam) minus 1.52*times the extended flow

of 13290190 (Pine Cr. Nr Oxbow).

The record of 13290190 (Pine Cr. Nr Oxbow) was filled in by formula and factors as shown below: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1.698 1.543 1.283 0.761 0.552 0.601 0.324 0.239 0.335 0.416 0.665 1.141

13290190 = 13292000 (Imnaha River @ Imnaha) times the factor in above table

10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

BRN5S 05/05/58 - 09/30/99 USACE brnelev.dat USACE BRN elev.'s and capacity table BRN.CAP

10/01/99 - 09/30/08 USACE Dataquery Storage (kaf) data from USACE Dataquery

BRN5A 07/01/28 - 09/30/08 BRN_H + BRN_S

Pine Creek

Imnaha River191.7

19.3

(13292000) Imnaha R. @ Imnaha; DA =622; Oct 28-Sep 08

269.65

Snake River

(13290450) Snake R. @ Hells Canyon Dam; DA =73,300; Aug 65-Sep 08

247.6

192.3

1.9

273.0

273.5

Hells Canyon Dam; DA =73,000

Oxbow Dam; DA =72,800

269.7

(13290200) Snake R. bl Pine Cr @ Oxbow; DA =73,150; Feb 58-Nov 67

(13290190) Pine Cr nr Oxbow; DA =230; Nov 66-Jun 96

(13290000) Snake R. @ Oxbow; DA =72,800 Jul 28-Mar 58, Oct 67-Sep 71

273.0Brownlee Dam; DA =72,590

Lower Snake Basin (Section 3.5)

Page B-38

SNAKE RIVERHELLS CANYON 13290440 (HCD)

river mile 247.6 Drainage Area: 73300 Sq. Mi.

Site Period Source Formula

HCD5H 07/01/28 - 09/30/28 USGS 13290000 Monthly volume of 1990 modified flow study shaped to+ shaping daily values of USGS 13290000 (Snake R. at Oxbow)

10/01/28 - 01/31/58 USGS 13290000 & Observed flow of 13290000 (Snake R at Oxbow)correlated 13290190 plus 2.17 times the extended flow of 13290190

(Pine Cr. Near Oxbow)

02/01/58 - 07/31/65 USGS 13290200 & Observed flow of 13290200 (Snake River below Pine correlated 13290190 Cr. At Oxbow) plus .65 times the extended flow of

13290190 (Pine Cr. Nr. Oxbow).

08/01/65 - 09/30/08 USGS 13290450 Observed flow of 13290450 (Snake River at Hells Canyon Dam).

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 1.6982 1.5427 1.2834 0.7609 0.5517 0.6009 0.3242 0.2387 0.3354 0.4161 0.6651 1.1408

Pine Cr. nr Oxbow (USGS 13290190) = Imnaha R. @ Imnaha (USGS 13292000) times factor above

HCD5S 10/01/67 - 09/30/99 USACE lsnk.dss lsnk.dss file

10/01/99 - 09/30/08 Idaho Power Storage data from Idaho Power

HCD5ARF 07/01/28 - 09/30/99 SSARR model Unregulated flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Pine Creek

Imnaha River191.7

19.3

(13292000) Imnaha R. @ Imnaha; DA =622; Oct 28-Sep 08

269.65

Snake River

(13290450) Snake R. @ Hells Canyon Dam; DA =73,300; Aug 65-Sep 08

247.6

192.3

1.9

273.0

273.5

Hells Canyon Dam; DA =73,000

Oxbow Dam; DA =72,800

269.7

(13290200) Snake R. bl Pine Cr @ Oxbow; DA =73,150; Feb 58-Nov 67

(13290190) Pine Cr nr Oxbow; DA =230; Nov 66-Jun 96

(13290000) Snake R. @ Oxbow; DA =72,800 Jul 28-Mar 58, Oct 67-Sep 71

273.0Brownlee Dam; DA =72,590

Lower Snake Basin (Section 3.5)

Page B-39

SALMON RIVERWHITE BIRD 13317000 (WHB)

river mile 53.7 Drainage Area: 13550 Sq. Mi.

Site Period Source Comments

WHB5H 07/01/28 - 09/30/08 USGS 13317000 Observed flow of 13317000 (Salmon R. at Whitebird).

WHB5A 07/01/28 - 09/30/08 WHB_H

Imnaha River

(13317000) Salmon R. @ White Bird; DA =13,550; Jul 28-Sep 08

53.7

Snake River

Salmon River

191.7

188.2

Lower Snake Basin (Section 3.5)

Page B-40

SNAKE RIVERLIME POINT 13317660 (LIM)

river mile 172 Drainage Area: 88000 Sq. Mi.

Site Period Source Comments

LIM5H 07/01/28 - 09/30/99 USGS 13317000 Observed flow of 13317000 (Salmon R at Whitebird) plus & 13292000 13292000 (Imnaha R at Imnaha) plus the historic flow& HCD4H from Hells Canyon Dam (see HCD4H for this derivation)

10/01/99 - 09/30/03 Calculated USGS 13334300 (Snake River nr Anatone) minus USGS 13333000 (Grande Ronde River at Troy) routed to Anatone

10/01/03 - 09/30/08 USGS 13317660 Observed flow of 13317660 (Snake R BL McDuff Rapids at China Gardens)

LIM5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Imnaha River

(13317000) Salmon R. @ White Bird; DA =13,550; Jul 28-Sep 99

53.7

Snake River

Salmon River

191.7

188.2

169.7

19.3

247.6

Lime Point; DA =88,000

Hells Canyon Dam; DA =73,300

(13292000) Imnaha R. @ Imnaha; DA =622; Jul 28-Sep 08

175.7(13317660) Snake R. Bl McDuff Rapids @ China Gardens; Oct 03-Sep 08

Grande Ronde River168.745.2

(13333000) Grande Ronde R. @ Troy; DA =3,412; Oct 44-Sep 08

Lower Snake Basin (Section 3.5)

Page B-41

GRAND RONDE RIVERTROY 13333000 (TRY)

river mile 45.2 Drainage Area: 3412 Sq. Mi.

Site Period Source Comments

TRY5H 07/01/28 - 09/30/44 USGS 13332500 Based on a correlation between 13333000 (Grande R at Troy) and 13332500 (Grande Ronde R at Rondowa)

13333000 = Grande Ronde at Rondowa 13332500 * a + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.24475 1.37261 1.64665 1.50711 1.43835 1.40375 1.47305 1.34011 1.14572 1.07122 1.04798 1.07627b 76.1362 36.9153 -113.92 12.4576 89.2971 120.839 -16.1374 -340.344 82.0946 240.483 190.246 171.7

10/01/44 - 09/30/08 USGS 13333000 Observed flow of 13333000 (Grand Ronde River at Troy).

TRY5A 07/01/28 - 09/30/08 TRY_H

Snake River

45.2 26.5

Wenaha Damsite; DA =3,412

(13333000) Grande Ronde R. @ Troy; DA =3,412; Oct 44-Sep 08

81.4

(13332500) Grande Ronde R. @ Rondowa; DA =2,555; Jul 28-Sep 91

168.7Grande Ronde River

Lower Snake Basin (Section 3.5)

Page B-42

SNAKE RIVERANATONE 13334300 (ANA)

river mile 167.2 Drainage Area: 92960 Sq. Mi.

Site Period Source Formula

ANA5H 07/01/28 - 07/31/58 SSARR model Daily flows at Anatone derived by SSARR model

08/01/58 - 09/30/08 USGS 13334300 Observed flow of 13334300 (Snake R near Anatone)

ANA5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Snake River

107.5

Lower Granite Dam; DA =103,500

167.2(13334300) Snake R. nr Anatone; DA =92,960; Aug 58-Sep 08

Clearwater River

145.3

139.3

Asotin Creek

(13342500) Clearwater R. @ Spalding; DA =9,570; Jul 28-Sep 08

(13334500) Asotin Cr. Nr Asotin; DA =156; Oct 28-Nov 59

7.0

11.6

(13343500) Snake R. nr Clarkston; DA =103,200; Jul 28-Dec 72

Snake River

132.9

Lower Snake Basin (Section 3.5)

Page B-43

CLEARWATER RIVEROROFINO 13340000 (ORO)

river mile 44.6 Drainage Area: 5580 Sq. Mi.

Site Period Source Formula

ORO5H 07/01/28 - 09/30/30 Corr. 13340000 & Based on a linear correlation between 13340000 13339000 (Clearwater R at Orofino) and 13339000 (Clearwater R

at Kamiah).1334000=a*13339000+b (see a and b below)

10/01/30 - 09/30/38 USGS 13340000 Observed flow of 13340000 (Clearwater R at Orofino)

10/01/38 - 09/30/64 Corr. 13340000 & Based on a linear correlation between 13340000 (Clear-13339000 water R at Orofino) and 13339000 (Clearwater R at

Kamiah) 1334000=a*13339000+b (see a and b below)

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.084 1.115 1.163 1.176 1.076 1.018 1.037 1.053 0.921 1.019 1.024 1.022b -35 -34 -80 34 96 946 1239 -644 1377 86 46 50

10/01/64 - 09/30/08 USGS 13340000 Observed flow of 13340000 (Clearwater R at Orofino)

ORO5A 07/01/28 - 09/30/08 ORO_H

44.6

Clearwater River

67.0

(13339000) Clearwater R. @ Kamiah; DA =4,850; Jul 28-Oct 65

(13340000) Clearwater R. @ Orofino; DA =5,580; Oct 30-Sep 38; Oct 64-Sep 08

Lower Snake Basin (Section 3.5)

Page B-44

NF CLEARWTR RIVERDWORSHAK 13340990 (DWR)

river mile 1.9 Drainage Area: 2440 Sq. Mi.

Site Period Source Comments

DWR5H 07/01/28 - 01/31/65 USGS13341000 Observed flow of 13341000 (NF Clearwater R near Ahsahka)

02/01/65 - 09/30/08 USGS 13341050 Observed flow of 13341050 (Clearwater R near Peck) & 13340000 minus observed flow of 13340000 (Clearwater R

at Orofino).

DWR5S 10/01/71 - 09/30/08 USGS 13340950 Observed storage content for USGS 13340950& USACE Dataquery USACE Dataquery strorage data used for July 1991, Jan,

April, May & June 1993, and Sep 2006 - Oct 2007

DWR5A 07/01/28 - 09/30/08 DWR_S + DWR_H

(13341050) Clearwater R. nr Peck; DA =8,040; Oct 64-Sep 08

37.4

Clearwater River

44.6

40.5

(13341000) NF Clearwater R. @ Ahsahka; DA =2,440; Jul 28-Jan 65

2.0

1.9

NF Clearwater River

Dworshak Dam; DA =2,440

(13340000) Clearwater R. @ Orofino; DA =5,580; Oct 30-Sep 38; Oct 64-Sep 99

Lower Snake Basin (Section 3.5)

Page B-45

CLEARWATER RIVERSPALDING 13342500 (SPD)

river mile 11.6 Drainage Area: 9570 Sq. Mi.

Site Period Source Comments

SPD5H 07/01/28 - 09/30/08 USGS 13342500 Observed flow of 13342500 (Clearwater River at Spalding)

SPD5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model.

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSimmodel using SSARR routing

40.5

North Fork Clearwater River

139.3

(13343500) Snake R. nr Clarkston; DA =103,200; Jul 28-Dec 72

Snake River Clearwater River

(13342500) Clearwater R. @ Spalding; DA =9,570; Jul 28-Sep 08

11.6

Snake River

132.9

Lower Snake Basin (Section 3.5)

Page B-46

SNAKE RIVERLOWER GRANITE 13343598 (LWG)

river mile 107.5 Drainage Area: 103500 Sq. Mi.

Site Period Source Comments

LWG5H 07/01/28 - 07/31/28 1990 mod. study & 1990 modified flow study volume shaped to USGS 13342500 USGS 13342500 (Clearwater R. @ Spalding).

08/01/28 - 12/31/72 USGS 13343500 Observed flow of 13343500 (Snake River at Clarkston).

01/01/73 - 09/30/99 USGS 13342500 Observed flow of 13342500 (Clearwater River at Spalding) plus& USGS 13334300 observed flow of 13334300 (Snake River at Anatone) plus & USGS 13334700 observed and extended flow of 13334700 (Asotin Cr below&LWG4S Kearney Gulch) minus LWG4S

13334700 = 13345000 (Palouse River near Potlatch) times a + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.066 0.237 0.077 0.188 0.061 0.099 0.073 0.130 0.394 0.549 0.503 0.128b 38 36 49 24 50 28 63 106 72 39 33 37

10/01/99 - 09/30/08 USGS 13342500 ROUTED {13342500 Clearwater@Spalding + 13334300 Snake@Anatone}& USGS 13334300 + USGS #13335050 Asotin Cr@Asotin – LWG5S.& USGS 13335050 The routed (Spalding + Anatone) value was obtained from ResSim&LWG5S

LWG5S 02/14/75 - 09/30/99 USACE lsnk.dss USACE data base lsnk.dss

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery, and stor-elev table from lsnk.dss

LWG5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Snake River

107.5

Lower Granite Dam; DA =103,500

167.2(13334300) Snake R. nr Anatone; DA =92,960; Aug 58-Sep 08

Clearwater River

145.3

139.3

Asotin Creek

(13342500) Clearwater R. @ Spalding; DA =9,570; Jul 28-Sep 08

5.3

11.6

(13343500) Snake R. nr Clarkston; DA =103,200; Jul 28-Dec 72

Snake River

132.9

(13334700) Asotin Cr. bl Kearney Gulch; DA =170; Oct 59-Oct 82, Oct 89-Jun 96

107.5

Little Goose Dam; DA =103,900

59.5

132.2(13345000) Palouse R nr Potlatch, DA =317; Dec 66-Sep 08

Palouse River

Lower Snake Basin (Section 3.5)

Page B-47

SNAKE RIVER LITTLE GOOSE 13343930 (LGS)river mile 70.3

Drainage Area: 103900 Sq. Mi.

Site Period Source Comments

LGS5H 07/01/28 - 07/31/28 1990 modified flow study 1990 modified flow study volume shaped to USGS 13334300and USGS 13334300

08/01/28 - 01/22/70 USGS 13343500 Observed flow of 13343500 (Snake River at Clarkston)

01/23/70 - 09/30/99 LWG4H & LGS4S LWG4H minus LGS4S

10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

LGS5S 01/23/70 - 09/30/99 USACE dss data base USACE lsnk.dss file

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery, and stor-elev table from lsnk.dss

LGS5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Snake River

107.5

Lower Granite Dam; DA =103,500

167.2(13334300) Snake R. nr Anatone; DA =92,960; Aug 58-Sep 08

Clearwater River

145.3

139.3

Asotin Creek

(13342500) Clearwater R. @ Spalding; DA =9,570; Jul 28-Sep 08

5.3

11.6

(13343500) Snake R. nr Clarkston; DA =103,200; Jul 28-Dec 72

Snake River

132.9

(13334700) Asotin Cr. bl Kearney Gulch; DA =170; Oct 59-Oct 82, Oct 89-Jun 96

107.5

Little Goose Dam; DA =103,900

59.5

132.2(13345000) Palouse R nr Potlatch, DA =317; Dec 66-Sep 08

Palouse River

Lower Snake Basin (Section 3.5)

Page B-48

SNAKE RIVERLOWER MONUMENTAL 13352595 (LMN)

river mile 41.6 Drainage Area: 108500 Sq. Mi.

Site Period Source Comments

LMN5H 07/01/28 - 10/30/61 IHR5H LMN5H = Derived IHR5H (see IHR5H)

11/01/61 - 09/30/08 IHR5H & IHR5S LMN5H = Derived IHR5A

LMN5S 11/27/61 - 09/30/99 USACE dss database USACE lsnk.dss file

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery, and stor-elev table from lsnk.dss

LMN5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Ice Harbor Dam and (13353000) Snake R. bl Ice Harbor Dam; DA =108,500; Apr 62-Sep 90; Oct 95-Sep 00

9.7

Snake River

107.570.341.6

Lower Granite Dam; DA =103,500

Little Goose Dam; DA =103,900

Lower Monumental Dam; DA =108,500

Lower Snake Basin (Section 3.5)

Page B-49

SNAKE RIVERICE HARBOR 13352980 (IHR)

river mile 9.7 Drainage Area: 108500 Sq. Mi.

Site Period Source Comments

IHR5H 07/01/28 - 03/31/62 Correlation with LWG_A See Steps 1 thru 3 below

04/01/62 - 09/30/90 USGS 13353000 Observed flow of 13353000 (Snake River below Ice Harbor Dam)

10/01/90 - 09/30/95 Correlation with LWG_A See Steps 1 thru 3 below

10/01/95 - 09/30/97 USGS 13353000 Observed flow of 13353000 (Snake River below Ice Harbor Dam)

10/01/97 - 09/30/98 Correlation with LWG_A See Steps 1 thru 3 below

10/01/98 - 09/30/00 USGS 13353000 Observed flow of 13353000 (Snake River below Ice Harbor Dam)

10/01/00 - 09/30/08 Correlation with LWG_A See Steps 1 thru 3 below

IHR5S 11/27/61 - 09/30/99 USACE lsnk.dss USACE lsnk.dss file

10/01/99 - 09/30/08 USACE Dataquery Elev data from USACE Dataquery & stor-elev table from lsnk.dss

Steps 1 thru Step 1 LWG_A = LWG_H + LWG_S + DWR_S + HCD_S + BRN_S correlations Compute adjusted

flow

Step 2 IHR_A correlated with LWG_A resulted in factors shown in table belowCorrelation IHR_A = a * LWG_A + b

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.962 1.012 1.023 1.057 1.045 1.016 0.991 0.979 0.974 1.006 1.036 1.039 b 1085 -59 118 -698 1465 1096 1629 2154 2752 509 -825 -1245

Correlation was based on concurrent flows adjusted for upstream storage during the concurrent period of record Apr 62-Sep 78. See 1980 modified flow report.

Step 3 IHR_H = IHR_A - (IHR_S + LMN_S + LGS_S + LWG_S + DWR_S + HCD_S + BRN_S )

IHR5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unreg. daily flows derived by ResSim model using SSARR routing

9.7

Snake River

107.570.341.6

Lower Granite Dam; DA =103,500

Little Goose Dam; DA =103,900

Lower Monumental Dam; DA =108,500

Ice Harbor Dam and (13353000) Snake R. bl Ice Harbor Dam; DA =108,500; Apr 62-Sep 90; Oct 95-Sep 00

Lower Snake Basin (Section 3.5)

Page B-50

COLUMBIA RIVERMcNARY 14019195 (MCN)

river mile 292 Drainage Area: 213500 Sq. Mi.

Site Period Source Comments

MCN5H 07/01/28 - 09/30/50 USGS 14048000 & 14033500 JDA4H minus 14048000 (John Day River at McDonald Ferry)and JDA_H and minus 14033500 (Umatilla R near Umatilla)

10/01/50 - 09/30/81 USGS 14019200 Observed flow of 14019200 (Columbia River at McNary Dam)

10/01/81 - 09/30/99 USACE lcol.dss USACE lcol.dss database

10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

MCN5S 04/19/53 - 09/30/99 USACE lcol.dss USACE lcol.dss database

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery & stor-elev table from lsnk.dss

MCN5A 07/01/28 - 09/30/08 MCN_H + MCN_S

MCN5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

John Day Dam; DA =226,000

9.7

Columbia River

292.0

McNary Dam; DA =213,500

289.0218.0

290.8

(14019200) Columbia R. @ McNary Dam; DA =214,000; Oct 50-Sep 81

(14033500) Umatilla R. nr Umatilla; DA =2,290; Jul 28-Sep 08

(14048000) John Day R. @ McDonald Ferry; DA =7,580; Jul 28-Sep 08

John

Day

Ri

ver

Umat

illa

Rive

r

Lower Columbia Basin (Section 3.6)

Page B-51

COLUMBIA RIVERJOHN DAY 14048006 (JDA)

river mile 215.6 Drainage Area: 226000 Sq. Mi.

Site Period Source Comments

JDA5H 07/01/28 - 11/01/60 USGS 14105700 & 14103000 Observed flow of 14105700 (Columbia River at The Dalles)minus observed flow of 14103000 (Deschutes R at Moody)

11/2/60 - 09/30/08 USGS 14105700 & 14103000 Observed flow of 14105700 (Columbia River at The Dalles)TDA_S minus observed flow of 14103000 (Deschutes R at Moody)

plus TDA5S

JDA5S 11/02/60 - 09/30/99 USACE lcol.dss USACE lcol.dss database

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery

JDA5A 07/01/28 - 09/30/99 JDA_H + JDA_S

JDA5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

215.6

John Day Dam; DA =226,000

204.1

188.9

(14105700) Columbia R. @ The Dalles; DA =237,000; Jul 28-Sep 08 (14103000) Deschutes R.

@ Moody nr Biggs; DA =10,500; Jul 28-Sep 08

Desc

hute

s Ri

ver

1.4

Lower Columbia Basin (Section 3.6)

Page B-52

ROUND BUTTE 14092150 (ROU)PELTON 14092455 (PEL)

PELTON REREG 14092495 (RER)

DESCHUTES RIVER river mile 110.6 Drainage Area: 7490 Sq. Mi.DESCHUTES RIVER river mile 102.8 Drainage Area: 7800 Sq. Mi.DESCHUTES RIVER river mile 100.1 Drainage Area: 7820 Sq. Mi.

Site Period Source Comments

ROU5H 07/01/28 - 09/30/08 USGS 14092500 Observed flow of USGS 14092500 (Deschutes R near Madras)

ROU5S 01/01/64 - 09/30/89 1990 modified flow study 1990 modified flow study semi-monthly data used as daily data

10/01/89 - 09/30/08 PGE PGE reservoir elevations and capacity table ROU.CAPto compute daily change of content

ROU5A 07/01/28 - 09/30/08 ROU_H + PEL_F + ROU_S

PEL5H 07/01/28 - 09/30/08 Same as ROU_H

Columbia River

102.8 Pelton Dam; DA =7,800

204.1

Pelton Rereg Dam and (14092500) Deschutes R. nr Madras; DA =7,820; Jul 28-Sep 08

Deschutes River

100.1

Round Butte Dam; DA =7,490110.6

Lower Columbia Basin (Section 3.6)

Page B-53

COLUMBIA RIVERTHE DALLES 14103950 (TDA)

river mile 191.5 Drainage Area: 237000 Sq. Mi.

Site Period Source Comments

TDA5H 07/01/28 - 09/30/08 USGS 14105700 Observed flow of USGS 14105700 (Columbia River at The Dalles)

TDA5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Columbia River

191.5

The Dalles Dam; DA =237,000

188.9

(14105700) Columbia R. @ The Dalles; DA =237,000; Jul 28-Sep 08

Lower Columbia Basin (Section 3.6)

Page B-54

COLUMBIA RIVERBONNEVILLE 14128860 (BON)

river mile 146.1 Drainage Area: 240000 Sq. Mi.

Site Period Source Comments

BON5H 07/01/28 - 12/31/60 USGS 14105700 & 14113000 Sum of the observed or extended flow of 14105700 (Columbia R at The Dalles) & 14121001 & 14123500 plus 14113000 (Klickitat R near Pitt)& 14124500 & 14128500 plus 14121001 (Hood River near Hood River) incl the power canal

plus 14123500 (White Salmon River near Underwood)plus 14124500 (Little White Salmon at Willard)plus 14128500 (Wind River near Carson)

01/01/61 - 09/30/99 USACE lcol.dss USACE lcol.dss data baseProject discharge

Little White Salmon @ Willard (USGS# 14124500) = Klickitat nr Pitt (USGS #14113000) * a + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.384 0.557 0.28 0.277 0.199 0.213 0.138 0.127 0.142 0.262 0.413 0.263b -242 -314 164 170 267 151 256 126 123 -10 -181 -125

Wind R. nr Carson (USGS #14128500) = Klickitat nr Pitt (USGS #14113000) * c + d Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepc 1.839 2.039 0.921 0.721 0.615 0.537 0.505 0.385 0.263 0.233 0.166 0.161d -998 -641 753 719 596 565 474 249 174 81 97 111

Klickitat nr Pitt (USGS #14113000) = White Salmon nr Underwood (USGS #14123500) * e + f Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepe 1.041 1.057 1.461 1.786 1.882 1.785 2.046 1.876 1.637 1.343 1.073 0.986f 103 82 -259 -552 -615 -479 -798 -349 -120 -22 85 127

White Salmon nr Underwood (USGS #14123500) = Klickitat nr Pitt (USGS #14113000) * g + h Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepg 0.87 0.876 0.613 0.498 0.489 0.512 0.396 0.47 0.549 0.671 0.822 0.86h -30 -11 280 424 426 377 605 344 195 102 12 -14

Wh. Salmon + L. Wh. Salmon + Wind = Klickitat nr Pitt (USGS #14113000) *j + k Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepj 3.838 3.202 1.531 1.707 1.2 1.237 0.792 0.819 1.073 1.264 1.528 1.289k -1857 -631 1589 969 1730 1188 2035 1212 273 96 -138 0

10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

BON5S 10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery

BON5ARF 07/01/28 - 09/30/99 SSARR model Unregulated daily flows derived by SSARR model

10/01/99 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Bonneville Dam; DA =240,000

146.1

Columbia River169.4

154.5

(14121001) Hood R. nr Hood River; DA =329; Jul 28-Sep 64

(14124500) Little White Salmon R. @ Willard; DA =114; Dec 44-Sep 61

(14128500) Wind R. nr Carson; DA =225; Oct 34-Oct 80

Win

d R

iver

Hoo

d R

iver

162.0 168.3 180.4

188.9

2.5

6.21.9 7.0

1.8

(14123500) White Salmon R. nr Underwood; DA =386; Jul 28-Sep 30; Sep 35-Sep 08 (14113000) Klickitat R. nr Pitt;

DA =1,297; Oct 28-Sep 08

(14105700) Columbia R. at The Dalles; DA =237,000; Jul 28-Sep 08

Littl

e W

hite

Sa

lmon

R

iver

Whi

te

Salm

on

Riv

er

Klic

kita

t R

iver

Lower Columbia Basin (Section 3.6)

Page B-55

MF WILLAMETTE RIVERHILLS CREEK 14145200 (HCR)

river mile 232.5 Drainage Area: 392 Sq. Mi.

Site Period Source Comments

HCR5H 07/01/28 - 09/30/35 USGS 14148000 1990 modified flow monthly values which were based on a graphicalcorrelation of 14145500 (MF Willamette R above Salt Cr nr Oakridge)and 14148000 (MF Willamette R below NF near Oakridge) with daily shape of USGS 14148000.

10/01/35 - 09/30/08 USGS 14145500 Observed flow of 14145500 (MF Willamette R above Salt Cr near Oakridge)

HCR5S 08/30/61 - 09/30/65 USGS 14145100 Reservoir elevations USGS 14145100 and capacity table HCR.CAP

10/01/65 - 09/30/74 USGS 14145100 Reservoir content from USGS 14145100

10/01/74 - 09/30/99 USGS 14145100 Reservoir elevations USGS 14145100 and capacity table HCR.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table HCR.CAP

HCR5A 07/01/28 - 09/30/08 HCR_H + HCR_S

MF Willamette River

232.5

Hills Creek Dam; DA =392

220.2

(14148000) MF Willamette R. bl North Fork nr Oakridge; DA =924; Jul 28-Sep 08

231.4

(14145500) MF Willamette R. ab Salt Cr nr Oakridge; DA =392; Oct 35-Sep 08

Willamette Basin (Section 3.7)

Page B-56

MF WILL. RIVERMF WILL. RIVER

LOOKOUT POINT 14149050 (LOP)DEXTER 14149150 (DEX)

river mile 206.9river mile 203.8

Drainage Area: 991 Sq. Mi.Drainage Area: 1000 Sq. Mi.

Site Period Source Comments

LOP5H 07/01/28 - 09/30/46 USGS 14148000 1990 modified flow study monthly values shaped to daily flow ofUSGS 14148000 (MF Willamette River below North Fork at Oakridge,formerly published as MF Willamette at Eula, 1928-1950).

10/01/46 - 09/30/08 USGS 14150000 Observed flow of USGS 14150000 (MF Willamette R nr Dexter)

LOP5S 11/07/53 - 09/30/61 USGS 14149000 Observed reservoir content of USGS 14149000

10/01/61 - 09/30/74 USGS 14149000 Reservoir content scanned from USGS paper publications

10/01/74 - 09/30/99 USGS 14149000 USGS reservoir elevations and capacity table LOP.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table LOP.CAP

DEX5S 10/01/60 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

LOP5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

LOP5S + 11/01/53 - 09/30/08 LOP_S + DEX_H LOP5S was smoothed by taking the outflow from HCR routed to LOP DEX5S and adding the smoothed LOP5L.

203.8 Dexter Dam; DA =1,001

(14150000) MF Willamette R. nr Dexter; DA =1,001; Oct 46-Sep 08

MF Willamette River

201.2

Lookout Point Dam; DA =991206.9

(14148000) MF Willamette R. @ Eula; DA =941; Jul 28-Sep 61; Jul 28 – Sep 08

216.4

Note: USGS 14148000 published as MF Willamette at Eula, 1928-1950 and MF Willamette below North Fork at Oakridge after 1950.

Willamette Basin (Section 3.7)

Page B-57

FALL CR. RIVERFALL CREEK 14150950 (FAL)

river mile 7.1 Drainage Area: 186 Sq. Mi.

Site Period Source Comments

FAL5H 07/01/28 - 09/30/35 1990 modified flow stu1990 modified flow study monthly values shaped to daily flow of USGS 14148000 (MF Willamette R. below North Forkat Oakridge, formerly published as MF Willamete at Eula, (1928-1950)

10/01/35 - 09/30/08 USGS 14151000 Observed flow of 14151000 (Fall Creek below Winberry Creek)

FAL5S 01/04/66 - 09/30/74 USGS 14150900 Observed reservoir content USGS 14150900

10/01/74 - 09/30/99 USGS 14150900 Observed reservoir elevations USGS 14150900 and capacity table FAL.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

FAL5A 07/01/28 - 09/30/08 FAL_H + FAL_S

7.1

Fall Creek Dam; DA =186

(14148000) MF Willamette R. bl North Fork nr Oakridge; DA =924; Jul 28-Sep 08

MF Willamette River

220.2

Note: USGS 14148000 published as MF Willamette at Eula, 1928-1950 and MF Willamette below North Fork at Oakridge after 1950.

6.1

(14151000) Fall Cr bl Winberry Cr nr Fall Cr; DA =186; Oct 35-Sep 08

198.3 Fall Cr

(14152000) MF Willamette R. @ Jasper; DA =1,340; Oct 52-Sep 08195.0

(14150000) MF Willamette R. nr Dexter; DA =1,001; Oct 46-Sep 08

201.2

Lookout Point Dam; DA =991

Dexter Dam; DA =1,001

Willamette Basin (Section 3.7)

Page B-58

COAST FK WILL RIVERCOTTAGE GROVE 14153100 (COT)

river mile 29.7 Drainage Area: 104 Sq. Mi.

Site Period Source Comments

COT5H 07/01/28 - 12/31/38 1990 modified flow st1990 monthly values shaped to USGS 14157000 (Coast ForkWillamette River @ Saginaw)

01/01/39 - 09/30/08 USGS 14153500 Observed flow of 14153500 (Coast Fork Willamette River below Cottage Grove)

COT5S 10/01/42 - 09/30/74 USGS 14153000 Scanned reservoir content from USGS paper records(electronic data not available)

10/01/74 - 09/30/99 USGS 14153000 Observed reservoir elevations USGS 14153000 and capacitytable COT.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

COT5A 07/01/28 - 09/30/08 COT_H + COT_S

Coast Fork Willamette River

29.7 Cottage Grove Dam; DA =104

19.7(14157000) Coast Fork Willamette R. @ Saginaw; DA =529; Jul 28-Sep 30

29.4(14153500) Coast Fork Willamette R. bl Cottage Grove Dam; DA =104; Jan 39-Sep 08

35.9(14152500) Coast Fork Willamette R. @ London; DA =72; Oct 35-Sep 86

Willamette Basin (Section 3.7)

Page B-59

ROW RIVERDORENA 14155100 (DOR)

river mile 7.6 Drainage Area: 270 Sq. Mi.

Site Period Source Comments

DOR5H 07/01/28 - 09/30/35 1990 modified flow stu1990 modified flow study monthly volume shaped toUSGS 14157000 (Coast Fork Willamette R @ Saginaw)

10/01/35 - 12/31/38 1990 modified flow stu1990 modified flow study monthly volume shaped toUSGS 14154500 (Row River above Pitcher Cr nr Dorena)

01/01/39 - 09/30/08 USGS 14155500 Observed flow of USGS 14155500 (Row Rnr Cottage Grove)

DOR5S 10/01/49 - 09/30/99 USGS 14155000 Observed USGS 14155000 reservoir elevations and capacity table DOR.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

DOR5A 07/01/28 - 09/30/08 DOR_H + DOR_S

Coast Fork Willamette River

19.7(14157000) Coast Fork Willamette R. @ Saginaw; DA =529; Jul 28-Sep 51

Row River20.7

Dorena; DA =27013.2

7.6

5.5

(14154500) Row R. ab Pitcher Cr. nr Dorena; DA =211; Sep 35-Sep 08

(14155500) Row R. nr Cottage Grove; DA =270; Jan 39-Sep 08

Willamette Basin (Section 3.7)

Page B-60

MC KENZIE RIVER CARMEN DIVERSION INFLOW 14158690 (CAR)

river mile 87.6 Drainage Area: 146 Sq. Mi.

Site Period Source Comments

CAR5H 07/01/28 - 09/30/57 Linear correlation Linear correlation of 14158700 (McKenzie River near Belknap Springs)10/01/62 - 09/30/08 with 14158500 (McKenzie River at Outlet of Clear Lake)

Flows for the period Jul 28-Sep 47 for 14158500 (McKenzie River at Outlet of Clear Lake) were filled in by linear regression with USGS 14159000(McKenzie River at McKenzie Bridge)

10/01/57 - 09/30/62 USGS 14158700 Observed flow of 14158700 (McKenzie Riveer near Belknap Springs)

Formula (1) Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.323 0.298 0.305 0.303 0.329 0.351 0.356 0.415 0.487 0.484 0.494 0.458b -138 -120 -107 -121 -172 -189 -151 -200 -318 -313 -314 -275

USGS14158500 = a * USGS14159000 + b

Formula (2) Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepc 0.910 1.103 1.046 1.003 1.111 0.996 1.246 1.552 1.001 0.761 0.731 0.055d 197 150 151 167 115 174 -4 -209 177 269 256 414

USGS 14158700 = c * USGS14158500 + d

HYD5A 07/01/28 - 09/30/08 CAR_H, max 630 cfs Represents flow in the diversion tunnel shown in the schematic. This tunnel has a 630 cfs max limit. HYD_A = CAR_H < 630 cfs. All CAR_H values greater than 630 are replaced with 630 cfs.

Diversion Tunnel

Smith River

81.91

2.1

Clear Lake (14158500) McKenzie R.

@ outlet of Clear Lake; DA =92.4; Jul 28 – Sep 08

Carmen Diversion Dam

(14158700) McKenzie R. nr Belknap Springs; DA =143; Oct 57-Sep 62

89.6

87.6

87.5

Smith River Dam, DA=18.3

630 cfs max

McKenzie River

69.9 81.9

4.4

(14158790) Smith R ab Smith R Res nr Belknap Spring; DA =16.2; Oct 60-Sep 08

(14158800) Smith R nr Belknap Spring; DA =23.1; Oct 57-Sep 60

0.2

(14158850) McKenzie R. bl Trail Bridge Dam nr Belknap Springs; DA =184; Oct 59 – Sep 08

81.5

Trail Bridge Dam; DA=184(14159000) McKenzie R. @ McKenzie Bridge; DA =348; Jul 28 – Oct 95

Power generation flow

Willamette Basin (Section 3.7)

Page B-61

SMITH RIVERSMITH R. RESERVOIR INFLOW 14158795 (SMH)

river mile 2.1 Drainage Area: 18 Sq. Mi.

Site Period Source Comments

SMH5A 07/01/28 - 09/30/57 1990 modified flow report 1990 modified flow report monthly volume shaped to& USGS 14162000 daily USGS 14162000 (Blue River near Blue River)

10/01/57 - 09/30/60 USGS 14158800 Observed flow of USGS 14158800 times .77(based on drainage area)

10/01/60 - 09/30/08 USGS 14158790 Observed flow of USGS 14158790 (Smith R Reservoir near Belknap Springs) times*1.13

C_S5A 07/01/28 - 09/30/08 SMH_A + HYD_A Carmin Smith Powerplant Inflow Represents the power generation flow (shown in schematic) that flows back to the McKenzie River through a penstock and powerhouse.

Diversion Tunnel

Smith River

81.91

4.4

2.1

0.2

Clear Lake

Carmen Diversion Dam87.6

Smith River Dam, DA=18.3

(14158790) Smith R. ab Smith R Res nr Belknap Springs; DA =16.2; Oct 60-Sep 08

630 cfs max

McKenzie River81.9

Trail Bridge Dam; DA=184

5.1

(14162000) Blue R. nr Blue River; DA =17; Sep 35 – Sep 64

57.0

Blue

Riv

er

(14162500) McKenzie R. nr Vida; DA =930; Jul 28 – Sep 08

47.7 69.9 81.5

(14159000) McKenzie R. @ McKenzie Bridge; DA =348; Jul 28 – Oct 95

(14158850) McKenzie R. bl Trail Bridge Dam nr Belknap Springs; DA =184; Oct 59 – Sep 08

(14158500) McKenzie R. @ outlet of Clear Lake; DA =92.4; Oct 47 – Sep 08

89.6

87.5 (14158700) McKenzie R. nr Belknap Springs; DA =143; Oct 57 – Sep 62

(14158800) Smith R. nr Belknap Springs; DA =23.1; Oct 57-Sep 60

Power generation flow

Willamette Basin (Section 3.7)

Page B-62

MC KENZIE RIVERTRAIL BRIDGE 14158840 (TRB)

river mile 81.9 Drainage Area: 184 Sq. Mi.

Site Period Source Comments

TRB5H 07/01/28 - 09/30/60 USGS 14159000 1990 modified monthly flow volume shaped to daily flowof USGS 14159000 (McKenzie R nr McKenzie Bridge)

10/01/60 - 09/30/08 USGS 14158850 Observed flow of 14158850

TRB5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Diversion Tunnel

81.5

(14158850) McKenzie R. bl Trail Bridge Dam nr Belknap Springs; DA =184; Oct 59-Sep 08

Smith River

81.91

2.1

Clear Lake

(14159000) McKenzie R. @ McKenzie Bridge; DA =348; Jul 28-Oct 95

Carmen Diversion Dam87.6

Smith River Dam, DA=18.3

630 cfs max

McKenzie River

69.9 81.957.0

Blue

Rive

rSo

uth

Fork

M

cKen

zie R

iver

5.1

(14162000) Blue R. nr Blue River; DA =17; Sep 35-Sep 64

47.7

(14162500) McKenzie R. nr Vida; DA =930; Jul 28 – Sep 08

62.3

(14159110) McKenzie R. ab South Fork nr Rainbow; DA =526; Jan 03-Sep 08

0.2

(14158800) Smith R. nr Belknap Springs; DA =23.1; Oct 57-Sep 60

Trail Bridge Dam; DA=184

4.4(14158790) Smith R. abSmith R. Res nr Belknap Springs; DA =16.2; Oct 60-Sep 08

87.5

89.6

Willamette Basin (Section 3.7)

Page B-63

SF MC KENZIE RIVERCOUGAR 14159450 (CGR)

river mile 4.5 Drainage Area: 208 Sq. Mi.

Site Period Source Comments

CGR5H 07/01/28 - 09/30/35 1990 modified flow stu1990 modified flow study volumes shaped toUSGS 14162500 (McKenzie R near Vida).

10/01/35 - 09/30/47 USACE Calculated flow from Corps Portland District Willamette Basinunregulated dataset.

10/01/47 - 09/30/08 USGS 14159500 Observed flow of USGS 14159500 (McKenzie R nr Rainbow).

CGR5S 10/01/63 - 09/30/99 USGS 14159400 Observed reservoir elevations and contents USGS 14159400(Cougar Reservoir nr Rainbow, OR) and capacity table CGR.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations from USACE Dataquery and capacity tableTable updated in Feb. 2002

CGR5A 07/01/28 - 09/30/08 CGR_H+CGR_S

McKenzie River

47.7

(14162500) McKenzie R. nr Vida; DA =930; Jul 28-Sep 08

SF McKenzie River

59.7

Cougar Dam; DA =2084.5

3.9(14159500) SF McKenzie R. nr Rainbow; DA =208; Oct 47-Sep 08

Willamette Basin (Section 3.7)

Page B-64

BLUE RIVERBLUE RIVER 14162150 (BLU)

river mile 1.7 Drainage Area: 88 Sq. Mi.

Site Period Source Comments

BLU5H 07/01/28 - 08/31/35 1990 modified flow study 1990 modified flow study volumes shaped to the daily flow of USGSUSGS 14159000 14162500 (Mckenzie R. near Vida) minus USGS 14159000 (McKenzie R. USGS 14162500 at McKenzie Bridge)

09/01/35 - 12/31/64 USGS 14162000 Observed flow of USGS 14162000 (Blue R nr Blue R) times * 1.173

01/01/65 -01/01/66 USGS 14161500 & Sum of the observed flows of USGS 14161100 and USGS 14161500USGS 14161100 times 1.26.

10/01/66 - 09/30/08 USGS 14162200 Observed flow of USGS 14162200 (Blue R @ Blue R)

BLU5S 10/01/68 - 09/30/74 USGS 14162100 Reservoir daily storage scanned from USGS paper recordsand scanned

10/01/74 - 09/30/99 USGS 14162100 Observed reservoir elevations USGS 14162100 and capacity table BLU.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

BLU5A 07/01/28 - 09/30/08 BLU_H + BLU_S

McKenzie River47.7

(14162500) McKenzie R. nr Vida; DA =930; Jul 28 – Sep 08

Blue River

57.0

Blue River Dam; DA =881.7

0.9 (14162200) Blue R. @ Blue River; DA =88; Feb 66-Sep 08

69.9

(14159000) McKenzie R. @ McKenzie Bridge; DA =348; Jul 28 – Oct 95

5.1 (14162000) Blue R. nr Blue River; DA =75; Sep 35-Sep 64

8.5

(14161100) Blue R. bl Tidbits Cr nr Blue River; DA =46; Sep 63 – Sep 03

Lookout Creek7.6

0.5

(14161500) Lookout Cr nr Blue River; DA =24; Aug 49 – Sep 55; Sep 63 – Sep 08

Willamette Basin (Section 3.7)

Page B-65

MC KENZIE RIVERLEABURG 14163100 (LEA)

river mile 38.8 Drainage Area: 1000 Sq. Mi.

Site Period Source Comments

LEA5H 07/01/28 - 09/30/51 USGS 14162500 & Observed flow of 14162500 (McKenzie R near Vida) plus 1.52 timesGAT5H the computed flow for the Gate Creek damsite. Gate Creek damsite monthly

flows were obtained from the 1980 modified flow study. These monthlyGate Cr. Dam site flows were then shaped to the flow resulting from USGS 14162500 (McKenzie R. nr Vida) minus USGS 14159000 (McKenzie R.st McKenzie Bridge) incremental flow.

10/01/51 - 09/30/57 USGS 14162500 & Observed flow of 14162500 (McKenzie R near Vida) plus 1.47 timesUSGS 14163000 the observed flow of 14163000 (Gate Creek @ Vida).

10/01/57 - 09/30/66 USGS 14162500 & Observed flow of 14162500 (McKenzie R near Vida) plus 1.52 timesGAT5H the computed flow for the Gate Creek damsite. Gate Creek damsite monthly

flows were obtained from the 1980 modified flow study. These monthlyGate Cr. Dam site flows were then shaped to the flow resulting from USGS 14162500 (McKenzie R. nr Vida) minus USGS 14159000 (McKenzie R.st McKenzie Bridge) incremental flow.

10/01/66 - 09/30/90 USGS 14162500 & Observed flow of 14162500 (McKenzie R near Vida) plus 1.47 timesUSGS 14163000 the observed flow of 14163000 (Gate Creek @ Vida).

10/01/90 - 09/30/08 USGS 14162500 & Observed flow of 14162500 (McKenzie R near Vida) times a monthlyLEA_H for 1966-1989 ratio of LEA_H/14162500 for the 1966-1989 water years.

LEA5A 07/01/28 - 09/30/08 LEA_H + CGR_S + BLU_S

McKenzie River

47.7

Gate Cr

0.4

Leaburg Dam; DA =1,000

38.828.5

41.4

(14163000) Gate Cr @ Vida; DA =47.6; Oct 51-Sep 57; Aug 66-Sep 90

Gate Cr Damsite; DA =46; Jul 28 – Sep 90

0.2

Waterville Dam; DA =1,050

33.320.9

(14162500) McKenzie R. nr Vida; DA =930; Jul 28-Sep 08

(14163150) McKenzie R. bl Leaburg Dam; DA =1,030; Oct 89-Sep 08

37.4

Willamette Basin (Section 3.7)

Page B-66

MC KENZIE RIVERWALTERVILLE 14163505 (WAV)

river mile 28.5 Drainage Area: 1050 Sq. Mi.

Site Period Source Comments

WAV5H 07/01/28 - 09/30/08 LEA_H 1.05 times the computed LEA_H flows(based on drainage area)

WAV5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

McKenzie River

47.7

Gate Cr

0.4

Leaburg Dam; DA =1,000

38.828.5

41.4

(14163000) Gate Cr @ Vida; DA =47.6; Oct 51-Sep 57; Aug 66-Sep 90

Gate Cr Damsite; DA =46; Jul 28 – Sep 90

0.2

Waterville Dam; DA =1,050

33.320.9

(14162500) McKenzie R. nr Vida; DA =930; Jul 28-Sep 08

(14163150) McKenzie R. bl Leaburg Dam; DA =1,030; Oct 89-Sep 08

37.4

Willamette Basin (Section 3.7)

Page B-67

LONG TOM RIVERFERN RIDGE 14168100 (FRN)

river mile 25.7 Drainage Area: 252 Sq. Mi.

Site Period Source Comments

FRN5H 07/01/28 - 09/30/39 1990 modified flow study Monthly volumes from 1990 modified flow study shapedto daily values of USGS 14170000 (Long Tom R. at Monroe).

10/01/39 - 09/30/50 USGS 14169000 Observed flow of USGS 14169000 (Long Tom R near Alvadore)

10/01/50 - 09/30/54 USGS 14169000 Observed flow of USGS 14169000 (Long Tom R near Alvadore) plus diversionto Coyote Creek.

10/01/54 - 09/30/60 USGS 14169000 Observed flow of 14169000 (Long Tom River nr Alavadore)

10/01/60 - 09/30/63 USGS 14169001 Observed flow of 14169001 (Long Tom River nr Alavadore plus diversion to Coyote Cr)

10/01/63 - 09/30/67 USGS 14169000 Observed flow of 14169000 (Long Tom River nr Alavadore)

10/01/67 - 09/30/85 USGS 14169001 Observed flow of 14169001 (Long Tom River nr Alavadore plus diversion to Coyote Cr)

10/01/85 - 09/30/08 USGS 14169000 Observed flow of 14169000 (Long Tom River nr Alavadore) plus 7 cfs diversionto Coyote Cr.

FRN5S 11/15/41 - 09/30/74 USGS 14168000 USGS 14168000 observed change of content from USGS electronic &paper records

10/01/74 - 09/30/99 USGS 14168000 USGS 14168000 observed reservoir elevation datacapacity table FRN.DOC

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

FRN5A 07/01/28 - 09/30/08 FRN_H + FRN_S

Long Tom River

Fern Ridge Dam; DA =25225.7

25.5

(14169000) Long Tom R. nr Alavadore; DA =252; Oct 39 - Sep 08

6.8(14170000) Long Tom R. at Monroe; DA =391; Jul 28 - Sep 08

(14169001) Long Tom R. + Diversion to Coyote Cr. Nr Alavadore; DA =252; Oct 60 - Sep 85

Willamette Basin (Section 3.7)

Page B-68

Willamette River SALEM 14191000 (SLM)river mile 84.16

Drainage Area: 7280 Sq. Mi.

Site Period Source Comments

ALB5H 07/01/28 - 09/30/08 USGS 14174000 Daily values from USGS # 14174000

ALB5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Willamette River

119.31(14174000) Willamette River at Albany; DA =4840; Jul 28-Sep 08

Willamette Basin (Section 3.7)

Page B-69

N. SANTIAM RIVERN. SANTIAM RIVER

DETROIT 14180550 (DET)BIG CLIFF 14180700 (BCL)

river mile 60.9river mile 58.1

Drainage Area: 438 Sq. Mi.Drainage Area: 453 Sq. Mi.

Site Period Source Comments

DET5H 07/01/28 - 09/30/35 1990 modified flow study 1990 modified flow study volumes shaped to daily flow of USGS 14183000 (N. Santiam R. at Mehama).

10/01/35 - 09/30/38 1990 modified flow study 1990 modified flow study volumes shaped to daily flow of 14183000 (N. Santiam R. at Mehama) minus 14182500(North Santiam R. nr Mehama).

10/01/38 - 09/30/52 USGS 14181500 Observed flow of USGS 1418500 (North Santiam R @ Niagara)

10/01/52 - 09/30/89 1990 modified flow study 1990 modified flow study volumes shaped to daily flow of 14181500 ( North Santiam R. at Niagara).

10/01/89 - 09/30/08 USGS 14181500 Observed flow of USGS 14181500 (North Santiam R @ Niagara)

DET5S 01/01/53 - 09/30/74 USGS 14180500 Observed content from USGS 14180500 (Detroit Lake nr. Detroit)

10/01/74 - 08/03/04 USGS 14180500 Observed reservoir elevations USGS 14180500(Detroit Lake nr. Detroit) and capacity table DET.CAP

08/04/04 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

BCL5S Nov-53 USACE Initial Fill at Big Cliff Reregulation Reservoir

DET5A 07/01/28 - 09/30/99 BCL_H + BCL_S + DET_S

10/01/99 - 09/30/08 DET_H + DET_S

North Santiam River

Detroit Dam; DA =438

60.6

57.3

(14181500) North Santiam R. @ Niagara; DA =453; Oct 38-Sep 08

38.7

(14183000) North Santiam R. @ Mehama; DA =655; Jul 28-Sep 08

Big Cliff Dam; DA =453

58.1

Niagara Dam; DA =453

55.6

2.0

(14182500) Little North Santiam R. nr Mehama; DA =112; Oct 31 -Sep 08

39.2

453 / 655 = 0.6916

Little North Santiam River

(14179000) Breitenbush R. ab French Cr. nr Detroit; DA =108; Jun 32 -Sep 87; Oct 98 – Sept 08 2.0

67.9

Breitenbush River

Willamette Basin (Section 3.7)

Page B-70

M. SANTIAM RIVERGREEN PETER 14186200 (GPR)

river mile 5.7 Drainage Area: 277 Sq. Mi.

Site Period Source Comments

GPR5H 07/01/28 - 09/30/31 1990 modified flow study Monthly 1990 flow values shaped to daily flow of USGS14186000 (Middle Santiam R near Foster).

10/01/31 - 09/30/47 USGS 14186000 Observed flow of USGS 14186000 (Middle Santiam R nr Foster).

10/01/47 - 09/30/50 1990 modified flow study Monthly 1990 flow values shaped to daily flow of USGS14187500 (South Santiam R @ Waterloo).

10/01/50 - 09/30/66 USGS 14186500 Observed flow of USGS 14186500 (Middle Santiam Rat mouth nr Foster).

10/01/66 - 09/30/80 USGS 14185800; 14185900 Green Peter historical flow computed as [14185800 (Middle Santian R near 14185000 Cascadia) plus 14185900 (Quartzville Cr. Cascadia) plus .638 times* local inflow] FOS5S; FOS5H; GPR5S minus Green Peter change of contents.

Local inflow computed as: (FOS5H plus FOS5S) minus 14185000, minus 14185800, minus 14185900.

10/01/80 - 05/31/94 USGS 14185700; 14185900 Green Peter historical flow computed as [14185700 (Middle Santiam R near Upper14185000 Soda) plus 14185900 (Quartzville Cr. Cascadia) plus .711 times local inflow] minusFOS5S; FOS5H; GPR5S Green Peter change of contents.

06/1/94 - 09/30/99 USGS14185700 extended Local inflow computed as: (FOS5H plus FOS5S) minus 14185000, minus 14185700, 14185900; 14185000 minus 14185900. 14185700 extended 6/01/94 to 9/30/99 by corr. with 14185900.FOS5S; FOS5H; GPR5S

Middle Santiam USGS14185700 = USGS 14185900*a + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.478 0.526 0.568 0.606 0.71 0.595 0.647 0.658 0.66 0.485 0.581 0.313b 6.349 5.819 28.45 -25.4 -117 22.18 56.59 85.47 61.91 50.99 17.25 23.13

10/01/99 - 09/30/08 USACE Dataquery Reservoir outflow from COE Dataquery

GPR5S 10/30/66 - 09/30/99 USGS 14186100 Reservoir contents from USGS publication for Water years 1967-1974.Reservoir elevations from USGS 14186000 for Water years 1975-1999 and capacitytable GPR.CAP.

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

GPR5A 07/01/28 - 09/30/08 GPR_H + GPR_S

23.3

(14187500) South Santiam R. @ Waterloo; DA =640; Jul 28 – Sep 08

40.0

Green Peter Dam; DA =2775.7

0.7(14186500) Middle Santiam R. @ mouth nr Foster; DA =287; Oct 50-Sep 66

(14185900) Quartzville Cr. Nr Cascadia; DA =99; Aug 63 – Nov 64; Oct 65 - Sep 08

6.6

Quartzville Cr

(14185700) Middle Santiam R. nr Upper Soda; DA =74.6; Oct 80-May 94(14185800) Middle Santiam R. nr Cascadia; DA =104; Aug 63 - Sep 81

(14186000) Middle Santiam R. nr Foster; DA =271; Oct 31 – Sep 47

48.5

(14185000) South Santiam R. bl Cascadia; DA =174; Sep 35-Sep 08;

9.0

23.9

17.5

7.1

37.7

Foster Dam; DA =493

Wiley Cr

South Santiam River37.4

Middle Santiam River

37.0

(14187200) South Santiam R. nr Foster; DA =557; Aug 73 – Sep 08

Willamette Basin (Section 3.7)

Page B-71

S. SANTIAM RIVERFOSTER 14186650 (FOS)

river mile 37.7 Drainage Area: 493 Sq. Mi.

Site Period Source Comments

FOS5H 07/01/28 - 08/31/35 USGS 14187500 1990 modified monthly flow values shaped to daily shape of 14187500 (South Santiam R @ Waterloo).

09/01/35 - 09/30/47 USGS 14185000; USGS 14186000 1990 modified monthly flow values shaped to USGS 14187500 daily shape of 14185000 (South Santiam R bl. Cascadia) plus

14186000 (Middle Santiam nr Foster) plus 0.0514 times14187500 (South Santiam R. at Waterloo).

10/01/47 - 10/31/50 USGS 14185000; USGS 14187000 1990 modified monthly flow values shaped to USGS 14187000 daily shape of 14185000 (South Santiam R bl. Cascadia) plus .55 times

14187500 (South Santiam R.at Cascadia) plus .75 times 14187000(Wiley Cr. Nr Foster)

11/01/50 - 09/30/66 USGS 14185000; USGS 14186500 Observed flow of 14185000 (South Santiam R. bl Cascadia) plusUSGS 14187000 observed flow of 14186500 (Middle Santiam R. at mouth nr Foster) plus

.75 times* 14187000 (Wiley Cr near Foster).

10/01/66 - 07/31/73 USGS 14186700 Observed flow of 14186700 (South Santiam River @ Foster).

08/01/73 - 08/31/73 USGS 14187200 1990 modified monthly flow values shaped to daily shape of 14187200 (South Santiam R nr Foster).

09/01/73 - 09/30/88 USGS 14187200 & USGS 14187100 Observed flow of 14187200 (South Santiam R near Foster) minusObserved flow of 14187100 (Wiley Cr. At Foster).

10/01/88 - 09/30/08 USGS 14187200 & USGS 14187000 Observed flow of 14187200 (South Santiam River near Foster) minus14187000 (Wiley Cr. Near Foster).

FOS5S 12/17/66 - 09/30/74 USGS 14186600 Observed USGS reservoir contents

10/01/74 - 09/30/99 USGS 14186600 Observed USGS elevations and capacity table FOS.CAP

10/01/99 - 09/30/08 USACE Dataquery Reservoir elevations COE Dataquery and capacity table

FOS5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

23.3

(14187500) South Santiam R. @ Waterloo; DA =640; Jul 28 – Sep 08

40.0

Green Peter Dam; DA =2775.7

0.7(14186500) Middle Santiam R. @ mouth nr Foster; DA =287; Oct 50-Sep 66

(14186000) Middle Santiam R. nr Foster; DA =271; Oct 31 – Sep 47

48.5

(14185000) South Santiam R. bl Cascadia; DA =174; Sep 35-Sep 08;

7.1

37.7

Foster Dam; DA =493

Wiley Cr

South Santiam River37.4

Middle Santiam River

37.0

(14187200) South Santiam R. nr Foster; DA =557; Aug 73 – Sep 08

37.5

(14187000) South Santiam R. @ Foster; DA =493; Oct 66 – Jul 73;

(14187100) Wiley Cr. @ Foster; DA =62; Sep 73 – Sep 88 1.4

(14187000) Wiley Cr. nr Foster; DA =51.8; Oct 47 – Jul 73, Jul 88 – Sep 08 4.4

Willamette Basin (Section 3.7)

Page B-72

Willamette River SALEM 14191000 (SLM)river mile 84.16

Drainage Area: 7280 Sq. Mi.

Site Period Source Comments

SLM5H 07/01/28 - 09/30/08 USGS 14191000 Daily values from USGS # 14191000

SLM5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Willamette River

84.16(14191000) Willamette River at Salem; DA =7280; Jul 28-Sep 08

Willamette Basin (Section 3.7)

Page B-73

WILLAMETTE RIVERT.W. SULLIVAN 14207750 (SVN)

river mile 26.6 Drainage Area: 10100 Sq. Mi.

Site Period Reach Source

SVN5H Streamflow for the entire period of record computed as the sum of the following seven components:

07/01/28 - 09/30/08 1. Willamette @ Salem Observed flow of USGS 14191000 (Willamette R at Salem).

07/01/28 - 09/30/08 2. S. Yamhill River nr Whiteson Extended flow of 14194000 (S. Yamhill River nr Whiteson):a. Jul 1928- May 1934Linear correlation of (Q1) S Yamhill R near Whiteson with (Q2) 14305500Siletz R at Siletz (Q1 = a*Q2+b).b. Jun 1934-Sep 1940Linear correlation of (Q3) S. Yamhill R near Whiteson with (Q4) 14193000Willamina Cr near Willamina (Q3= c*Q4+d).c. Oct 1940-Sep 1991Observed flow of 14194000 (S Yamhill R near Whiteson).d. Oct 1991-Feb 1992Linear correlation of (Q1) S Yamhill R near Whiteson with (Q2) 14305500Siletz R at Siletz (Q1 = a*Q2+b).e. Mar 1992-Jun 1992Observed flow of 14194000 (S Yamhill R near Whiteson).f. Jul 1992- Sep 1994Linear correlation of (Q1) S Yamhill R near Whiteson with (Q2) 14305500Siletz R at Siletz (Q1 = a*Q2+b).g. Oct 94-Sep 08Observed flow of 14194150 (S Yamhill R at McMinnville).

07/01/28 - 09/30/08 3. N. Yamhill River at Pike Extended flow of 14197000 (N Yamhill R at Pike)a. Jul 1928-May 1934 Linear correlation of (Q5) N Yamhill R at Pike with Q6 (14305500) Siletz R at Siletz Q5=e*Q6+fb. June 1934-Sep 1940Linear correlation of (Q7) N Yamhill R at Pike with Q8 (14193000) Willamina Cr nr Willamina Q7 = g*Q8 + h.c. Oct 1940-Sep 1948Observed flow of 14196500 (N Yamhill R nr Pike) * 1.22.d. Oct 1948-Sep 1973Observed flow of 14197000 (N Yamhill R at Pike) e. Oct 1973- Sep 1991Linear correlation of (Q7) N Yamhill R at Pike with Q8 (14193000) Willamina Cr. Nr. Willamina Q7 = g*Q8+hf. Oct 1991-Sep 2008Linear correlation of (Q5) N Yamhill R at Pike with Q6 (14305500) Siletz R at Siletz Q5=e*Q6+f

Willamette Basin (Section 3.7)

Page B-74

WILLAMETTE RIVERT.W. SULLIVAN 14207750 (SVN)

river mile 26.6 Drainage Area: 10100 Sq. Mi.

Site Period Reach Source

SVN5H 07/01/28 - 09/30/08 4. Molalla R near Canby Extended flow of 14200000 (Molalla R. near Canby)continued a. Jul 1928

Jul 1929 used as estimated Jul 28b. Aug 1928-Sep 1959Observed flow of 14200000 (Molalla R near Canby)c. Oct 1959-Sep 1963Linear correlation of (Q9) Molalla R. nr Canby with (Q10) 14202000Pudding R. at Aurora Q9=I*Q10+j.d. Oct 1963-Feb1979Observed flow of 14200000 (Molalla R near Canby)e. Mar 1979-Sep 1993Linear correlation of (Q11) Molalla R. nr Canby with (Q12) 14198500above Pine Creek near Wilhoit Q11 = k*Q12+l f. Oct 93-Sep 99Linear correlation of (Q9) Molalla R. nr Canby with (Q10) 14202000Pudding R. at Aurora Q9=I*Q10+j.e. Oct 99-Sep 08Observed flow of 14200000 (Molalla R near Canby)

07/01/28 - 09/30/08 5. Pudding River Extended flow of 14202000 (Pudding River at Auroraa. Jul 28-Sep28Linear correlation of (Q11) Pudding R at Aurora with (Q12) 14200000Molalla R near Canby Q11=m*Q12+n.b. Oct 28-Sep 64Observed flow of USGS 14202000 (Pudding R at Aurora)c. Oct 64-Jun 20, 1993Linear correlation of (Q11) Pudding R at Aurora with (Q12) 14200000Molalla R near Canby Q11=m*Q12+n.d. Jun 21 1993-Sep 1997Observed flow of USGS 14202000 (Pudding R at Aurora)e.Oct 97-Sep 08Observed flow of USGS 14201340 (Pudding R nr Woodburn)*1.526(based on drainage area ratio).

07/01/28 - 09/30/08 6. Tualatin River Extended flow of 14207500 (Tualatin River at West Linn).a. Jul 28-Sep 28Total flow (including Oswego Canal) based on engineering judgment ofmagnitude of summer flow of Oswego Canal and the partial record for14207500 (Tualatin R at West Linn).b. Oct 28-Sep 08Observed flow of 14207500 (Tualatin R at West Linn) and 14207000 (Oswego Canal near Lake Oswego). Monthly historical averages Oswego Canal flows for the Oct 93-Sep 08 period.

07/01/28 - 09/30/08 7. Ungaged Streamflow Allowance for ungaged streamflow Jul 28- Sep 08a. May-October1.2 times observed and extended flow of 14202000 (Pudding R at Aurora)b. November-April1.5 times observed and extended flow of 14202000 (Pudding R at Aurora)

SVN5ARF 07/01/28 - 09/30/08 ResSim model Unregulated daily flows derived by ResSim model using SSARR routing

Willamette Basin (Section 3.7)

Page B-75

WILLAMETTE RIVERT.W. SULLIVAN 14207750 (SVN)

river mile 26.6 Drainage Area: 10100 Sq. Mi.

SVN5H

Regression CoefficientsOct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

S. Yamhill River 14194000 with 14305500 Siletz at Siletza 0.6 1.15 1.41125 1.4246 1.48651 1.41332 1.48023 0.90094 0.58827 0.46192 0.38907 0.375829b -19 -643.9 -537.8 -147.79 -318.3 -241.1 -476.6 -2.6 36.1 5.81 -3.3 4.97

S. Yamhill River 14194000 with 14193000 Willamina Cr near Willaminac 6.3 7.03386 7.17544 7.39007 7.71755 6.99463 7.67974 6.75758 6.11594 5.46596 4.35565 6.704458d -47 -174.3 -93.7 -50.5 -290.9 -206.8 -412.5 -194.1 -116.3 -73.7 -37.9 -71.1

N. Yamhill R. at Pike 14197000 with 14305500 Siletz R at Siletz.e 0.1 0.12095 0.17225 0.17047 0.18724 0.17303 0.14638 0.10879 0.0582 0.03804 0.03598 0.028764f -0.40 -24.88 -54.91 -1.07 -18.03 23.80 11.96 24.94 25.40 12.83 6.88 7.55

N. Yamhill R. at Pike 1419700 with 14193000 Willamina Cr near Willaminag 0.7 0.81131 0.8632 0.91166 0.99823 0.88649 0.84021 0.88759 0.63923 0.79081 0.54428 0.557428h -2.40 1.47 2.01 -3.90 -41.59 2.54 -1.74 -8.40 6.68 -4.63 0.74 0.70

Molalla R near Canby 14200000 with 14202000 Pudding River at AuroraI 1.3 0.99846 0.79892 0.81069 0.73331 0.69427 0.71229 1.37073 1.48452 1.33535 1.16746 1.641895j 9.70 142.79 164.00 -125.70 80.60 317.20 449.00 22.30 38.50 6.90 9.10 -29.40

Molalla R near Canby 14200000 with 14198500 Molalla River above Pine Creek near Wilhoitk 2 2.19731 2.21965 2.12005 1.86881 2.07335 1.9955 2.20356 1.85798 2.21898 1.94077 1.753951l -13 -50.45 -4.159 168.4 334.7 174.70 85 -54.23 73.43 -20.877 -1.048 12.8188

Pudding R at Aurora 14202000 with 14200000 Molalla R near Canbym 0.7 0.92281 1.19677 1.16059 1.24841 1.25666 1.22146 0.67432 0.50749 0.60579 0.56982 0.527768n 0 -27.1 -88.7 308.4 124.4 -130.4 -348.5 47.9 79.56 23.46 18.2 27.4

Willamette River

6.2

(14191000) Willamette R. @ Salem; DA =7,280; Jul 28-Sep 08

Tualatin River

23.1

(14207500) Tualatin R. @ West Linn; DA =706; Aug 28-Sep 08

28.4

16.7

Sullivan Dam; DA =10,100

(14196500) N. Yamhill R. nr Pike; DA =49; Oct 40-Sep 51

1.8

Yamhill River

84.1

35.70.8

54.911.2

42.7

26.6

(14200000) Molalla R. nr Canby; DA =323; Aug 28-Sep 59; Oct 63-Sep 78; Oct 00-Sep 08

6.0 32.5

(14198500) Molalla R. ab PC nr Wilhout; DA =97; Oct 35-Sep 93

Molalla River

(14202000) Pudding R. @ Aurora; DA =479; Oct 28-Sep 64; Oct 93-Sep 97; Nov 02 – Sep 08

8.1

23.4 (14201340) Pudding R. nr Woodburn; DA =314; Oct 97-Sep 08

(14197000) N. Yamhill R. @ Pike; DA =67; Oct 48-Sep 73

20.5N. Yamhill River

(14194000) S. Yamhill R. nr Whiteson; DA =502; Oct 89 – Sep 91; Mar 93 – Jun 95

5.6(14194150) S. Yamhill R. at McMinnville; DA =528; Oct 94-Sep 08

S. Yamhill River

Willamina Cr.

(14193000) Willamina Cr. nr Willamina; DA =65; Jun 34-Sep 91

(14207000) Oswego canal nr Lake Oswego; Oct 28-Sep 93

6.8

(14210000) Clackamas R. @ Estacada; DA =671; Aug 28-Sep 08

23.1

Willamette Basin (Section 3.7)

Page B-76

OAK GROVE FKTIMOTHY MEADOWS 14208695 (TMY)

river mile 15.8 Drainage Area: 53 Sq. Mi.

Site Period Source Comments

TMY5H 07/01/28 - 09/30/56 USGS 14209000 & 1990 flow study semi-monthly values shaped to USGS 1990 modified flow 14209000 (Oak Grove Fork ab Powerplant Intake)study

10/01/56 - 09/30/08 USGS 14208700 Observed flow of USGS 14208700 (Oak Grove Fork near Government Camp)

TMY5S 07/01/28 - 09/30/89 1990 modified flow 1990 flow study semi-monthly valuesstudy

10/01/89 - 09/30/08 PGE Timothy Lake reservoir elevations and TMY.CAP reservoir capacity table.

TMY5A 07/01/28 - 09/30/08 TMY_H + TMY_S

Clackamas River

53.0

(14209000) Oak Grove Fork ab Powerplant Intake; DA =126; Jul 28-Sep 08

6.1

15.5

15.8

(14208700) Oak Grove Fork nr Government Camp; DA =54; Jul 56-Sep 08

Timothy Meadows Dam; DA =53

Oak Grove Fork

Willamette Basin (Section 3.7)

Page B-77

OAK GROVE FKOAK GROVE 14209095 (OAK)

river mile 5.1 Drainage Area: 126 Sq. Mi.

Site Period Source Comments

OAK5H 07/01/28 - 09/30/08 USGS 14209000 Observed flow of USGS 14209000 (Oak Grove Fork above Powerplant Intake)

OAK5A 07/01/28 - 09/30/08 OAK_H + TMY_S

Clackamas River

53.0

6.1

5.1

(14209000) Oak Grove Fork ab Powerplant Intake; DA =126; Jul 28-Sep 99

Oak Grove Dam; DA =126

Oak Grove Fork

Willamette Basin (Section 3.7)

Page B-78

NORTH FORK 14209805 (NFK)FARADAY 14209850 (FAR)

RIVER MILL 14209995 (RML)

CLACKAMAS RIVER river mile 31.1 DrainageCLACKAMAS RIVER river mile 26.2 DrainageCLACKAMAS RIVER river mile 23.3 Drainage

Site Period Source Comments

NFK5H 07/01/28 - 09/30/08 USGS 14210000 Observed flow of USGS 14210000 (Clackamas River @ Estacada)

NFK5S 11/01/58 - 06/30/68 1990 modified flow studyMonthly change in content for this period available from prior studies

07/01/68 - 09/30/99 Not Obtained Reservoir change of content data not available for this period.Reservoir fluctuation is minor at this project.

10/01/99 - 09/30/08 PGE Elevation data obtained from PGE

NFK5A 07/01/28 - 09/30/08 NFK_H + NFK_S + TMY_S

Willamette River

24.8

23.1 31.1

(14210000) Clackamas R. @ Estacada; DA =671; Jul 28-Sep 99

North Fork Dam; DA =665

Clackamas River

23.3

River Mill Dam; DA =671

26.2

Faraday Dam; DA =667

Willamette Basin (Section 3.7)

Page B-79

LEWIS RIVERLEWIS RIVER

SWIFT 1 14217610 (SWF)SWIFT 2 14217814 (SW2)

river mile 47.9river mile 47.9

Drainage Area: 480 Sq. Mi.Drainage Area: 480 Sq. Mi.

Site Period Source Comments

SWF5A 07/01/28 - 09/30/58 USGS 14218000 Observed flow of USGS 14218000 (Lewis River near Cougar)

10/01/58 - 09/30/08 PacifiCorp Project Inflow provided by PacifiCorp

Lewis River

(14218000) Lewis R. nr Cougar; DA =481; Jul 28-Sep 58

Swift Dam & Reservoir; DA =480

47.9

Western Washington Basin (Section 3.8)

Page B-80

LEWIS RIVERYALE 14218510 (YAL)

river mile 34.2 Drainage Area: 596 Sq. Mi.

Site Period Source Comments

YAL5A 07/01/28 - 09/30/58 1990 study Project flows furnished by PacifiCorp for the 1990 modfied flow study

10/01/58 - 09/30/08 PacifiCorp Daily project natural flows furnished by PacifiCorp.

Lewis River

Yale Dam; DA =506

34.2

Western Washington Basin (Section 3.8)

Page B-81

LEWIS RIVERARIEL (MERWIN) 14220010 (MER)

river mile 19.5 Drainage Area: 730 Sq. Mi.

Site Period Source Comments

MER5H 07/01/28 - 09/30/08 USGS 14220500 Observed flow of USGS 14220500 (Lewis River at Ariel)

MER5A 07/01/28 - 09/30/08 PacifiCorp Daily project natural flows furnished by PacifiCorp.

Lewis River

(14220500) Lewis R. at Ariel; DA =731; Jul 28-Sep 08

Ariel Dam; DA =730

19.5

Western Washington Basin (Section 3.8)

Page B-82

LAKE CREEK

PACKWOOD LAKE 14225420 (PKL)PACKWOOD (PAK)

river mile 5.3 Drainage Area: 19 Sq. Mi.

Site Period Source Comments

PAK5H 07/01/28 - 09/30/89 1990 study Monthly data from the 1990 modified flow study

10/01/89 - 09/30/08 Energy Northwest (formerly WPPSS) Power discharge plus fish discharge

PAK5S 09/01/59 - 09/30/73 1990 study Monthly data from the 1990 modified flow study

10/01/73 - 09/30/80 USGS 14225400 Daily reservoir elevations and PAK.CAP capacity table

10/01/80 - 09/30/89 1990 study Monthly data from the 1990 modified flow study

10/01/89 - 09/30/08 Energy Northwest (formerly WPPSS) Daily reservoir elevations and PAK.CAP capacity table

PAK5A 07/01/28 - 09/30/99 PAK_H + PAK_S

10/01/99 - 09/30/08 Energy Northwest (formerly WPPSS) Daily lake inflow data from Energy Northwest

Packwood Lake

Packwood Lake Dam; DA =19.25.3

Lake Creek

129.2

Cowlitz River

Power House

Power Canal

125.3

Western Washington Basin (Section 3.8)

Page B-83

COWLITZ RIVERMOSSYROCK 14234802 (MOS)

river mile 65.5 Drainage Area: 1170 Sq. Mi.

Site Period Source Comments

MOS5H 10/01/99 - 09/30/08 USACE Dataquery Flow data from USACE Dataquery

MOS5S 10/01/99 - 09/30/08 USACE Dataquery Storage (kaf) data from USACE Dataquery

MOS5A 07/01/28 - 09/30/89 1990 study Semi-monthly data from the 1990 modified flow study

10/01/89 - 09/30/99 Data from Tacoma City Light Unregulated streamflows (except for Packwood) furnished and PAK_S by Tacoma City Light. Adjustment was made for Packwood

Lake change-of-content .

10/01/99 - 09/30/08 MOS_H + MOS_S + PAK_S

Cowlitz River

(14235000) Cowlitz R. at Mossyrock; DA =1162; Jul 28-Jul 32; Mar 33-Sep 35

Mossyrock Dam65.5

(14238000) Cowlitz R. bl Mayfield Dam; DA =1400; Apr 34-Sep 08

Mayfield Dam52.0

(14233400) Cowlitz R. near Randle; DA =1030; Oct 47-Sep 94 prior to Oct 67 published as (14233500) Cowlitz R. near Kosmos

(14226500) Cowlitz R. at Packwood; DA =287; Oct 29-Sep 08126.5

125.3

89.3

61.1

50.6

Packwood Lake

Western Washington Basin (Section 3.8)

Page B-84

COWLITZ RIVERMAYFIELD 14237810 (MAY)

river mile 52 Drainage Area: 1400 Sq. Mi.

Site Period Source Notes

MAY5H 07/01/28 - 07/31/32 USGS 14235000 & 1990 study 1990 modified flow study semi-monthly flows shaped to USGS 14235000

08/01/32 - 02/28/33 USGS 14226500 & 1990 study 1990 modified flow study semi-monthly flows shaped to USGS 14226500

03/31/33 - 03/31/34 USGS 14235000 & 1990 study 1990 modified flow study semi-monthly flows shaped to USGS 14235000

04/01/34 - 09/30/08 USGS 14238000 Observed flow of USGS 14238000 (Cowlitz R below Mayfield Dam)

MAY5S 04/01/62 - 07/31/74 1990 study Monthly change of content from 1990 modified flow study

08/01/74 - 09/30/99 USGS 14237800 Daily reservoir elevations from USGS 14237800 and capacity table MAY.CAP

10/01/99 - 09/30/08 USACE Dataquery Storage (kaf) data from USACE Dataquery

MAY5A 07/01/28 - 09/30/08 MAY_H + MAY_S + MOS_S + PAK_S

Cowlitz River

(14235000) Cowlitz R. at Mossyrock; DA =1162; Jul 28-Jul 32; Mar 33-Sep 35

Mossyrock Dam65.5

(14238000) Cowlitz R. bl Mayfield Dam; DA =1400; Apr 34-Sep 08

Mayfield Dam52.0

(14233400) Cowlitz R. near Randle; DA =1030; Oct 47-Sep 94 prior to Oct 67 published as (14233500) Cowlitz R. near Kosmos

(14226500) Cowlitz R. at Packwood; DA =287; Oct 29-Sep 08126.5

125.3

89.3

61.1

50.6

Packwood Lake

Western Washington Basin (Section 3.8)

Page B-85

N. FK. SKOKOMISH RIVERCUSHMAN 1 12057100 (CS1)

river mile 19.6 Drainage Area: 94 Sq. Mi.

Site Period Source Comments

CS15A 07/01/28 - 09/30/89 1990 study Semi-monthly data from 1990 modified flow study

10/01/89 to 9/30/08 Tacoma Power Semi-monthly data from Tacoma Power

NF Skokomish

(12057500) NF Skokomish R. nr Hoodsport; DA =94; Jul 28-Sep 30; Oct 40-Sep 78

Cushman No. 1 Dam19.6

Cushman No. 2 Dam; DA=99

17.3

19.6

Deer Meadow Cr19.1

Power Conduit Hoods Canal

Western Washington Basin (Section 3.8)

Page B-86

N. FK. SKOKOMISH RIVERCUSHMAN 2 12058610 (CS2)

river mile 17.3 Drainage Area: 99 Sq. Mi.

Site Period Comments

CS25A 07/01/28 - 09/30/08 CS14A flows plus adjustment

Flows for Cushman 2 are computed by adding the flows forCushman 1 plus the following monthly adjustments (in cfs) which arethe estimated incremental flow between Cushman 1 and Cushman 2. These estimates are based on past record monthly trends from the Deer Meadow Creek gage.

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 3 10 15 18 15 11 6 4 3 1 0 1

(12057500) NF Skokomish R. nr Hoodsport; DA =94; Jul 28-Sep 30; Oct 40-Sep 78

Cushman No. 1 Dam19.6

Cushman No. 2 Dam; DA=99

17.3

19.6

Deer Meadow Cr 19.1

Power Conduit Hoods Canal

NF Skokomish

(12058000) Deer Meadow Cr nr Hoodsport; DA =1.83; Aug 50-Aug 51; Oct 52-Aug 73

0.5

Western Washington Basin (Section 3.8)

Page B-87

NISQUALLY RIVER

LAGRANDE 12085510 (LAG)ALDER 12085010 (ALD)

river mile 42.5river mile 44.2 D.A. 289 sq. mi.

D.A. 286 sq. mi.

Site Period Source Comments

LAG5H 07/01/28 - 09/30/31 USGS 12086500 Observed flow of USGS 12086500 (Nisqually River at La Grande)

10/01/31 - 09/30/43 USGS12084000 Observed flow of USGS 12084000 (Nisqually River near Alder) plus& USGS12084500 1.315 times 12084500 (Little Nisqually River near Alder).

10/01/43 - 09/30/08 USGS 12086500 Observed flow of USGS 12086500 (Nisqually River at La Grande)

ALD5S 11/01/44 - 01/31/45 1990 study semi monthly values from 1990 modified flow study

02/01/45 - 09/30/99 USGS 12085000 Reservoir content when provided and where reservoir elevations were provided capacity table ALD.CAP was used

10/01/99 - 09/30/08 USACE Dataquery Elevation data from USACE Dataquery

LAG5A 07/01/28 - 09/30/08 LAG_H + ALD_S

(12084000) Nisqually R. nr Alder; DA =252; Sep 31-Oct 44

La Grande Dam; DA=28942.5

46.5

Little Nisqually River44.6

Nisqually River

(12086500) Nisqually R. @ La Grande; DA =292; Jul 28-Sep 31; Oct 43-Sep 0840.4

Alder Dam; DA=28644.2

0.3

(12084500) Little Nisqually R. nr Alder; DA =28; Jul 28-May 43

Western Washington Basin (Section 3.8)

Page B-88

ROSS 12175010 (ROS)DIABLO 12176510 (DIA)

GORGE 12177710 (GOR)

SKAGIT RIVER river mile 105.2 Drainage Area: 999 Sq. Mi.SKAGIT RIVER river mile 101 Drainage Area: 1125 Sq. Mi.SKAGIT RIVER river mile 96.6 Drainage Area: 1159 Sq. Mi.

Site Period Source Comments

ROS5A 07/01/28 - 09/30/89 1990 study Semi-monthly flow values provided by Puget Sound Power &Light for the 1990 modified flow study

10/01/89 - 09/30/08 Seattle City Lights Daily unregulated flow values provided by Seattle City Lights

Ross Dam; DA=999

105.2

Gorge Dam; DA=1159

96.6

Skagit River

Diablo Dam; DA=1125

101.0

Western Washington Basin (Section 3.8)

Page B-89

BAKER RIVERBAKER RIVER

UPPER BAKER 12191610 (UBK)LOWER BAKER 12193010 (SHA)

river mile 9.3river mile 1.2

Drainage Area: 215 Sq. Mi.Drainage Area: 297 Sq. Mi.

Site Period Source Comments

UBK5A 07/01/28 - 09/30/89 1990 study Semi-monthly flow values provided by Seattle City Lightfor the 1990 modified flow study

10/01/89 - 09/30/08 Data from Puget Sound Energy Semi-monthly unregulated flow values provided by Puget Sound Energy

Lower Baker Dam; DA=2971.2

Baker River

Upper Baker Dam; DA=2159.3

Western Washington Basin (Section 3.8)

Page B-90

ROGUE RIVERLOST CREEK 14335050 (LOS)

river mile 157.2 Drainage Area: 674 Sq. Mi.

Site Period Source Comments

LOS5H 07/01/28 - 09/30/28 USGS 14328000 Flow derived from a correlation of (Q1) 14335000(Rogue River below South USGS 14335000 Fork Rogue River near Prospect) with the flow of (Q2) 14328000 (Rogue River

above Prospect) times the monthly weighting factors shown below.Q1 = (a*Q2 + b)*Monthly Weighting Factor

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.828 1.752 2.126 2.188 2.057 1.906 1.823 1.745 1.827 2.170 2.115 2.068b 225 242 22 73 181 315 240 318 349 145 152 145

Monthly Weighting Factors Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1.010 1.020 1.035 1.035 1.040 1.040 1.015 1.010 1.008 1.006 1.005 1.007

10/01/28 -0 9/30/65 USGS 14335000 Observed flow of 14335000 (Rogue River below South Fork Rogue River near Prospect) times the monthly weighting factors shown above.

10/01/65 - 09/30/67 USGS 14328000 Flow derived from a correlation of (Q1) 14335000(Rogue River below South USGS 14335000 Fork Rogue River near Prospect) with the flow of (Q2) 14328000 (Rogue River

above Prospect) times the monthly weighting factors shown below.Q1 = (a*Q2 + b)*Monthly Weighting Factor

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 1.828 1.752 2.126 2.188 2.057 1.906 1.823 1.745 1.827 2.170 2.115 2.068b 225 242 22 73 181 315 240 318 349 145 152 145

Monthly Weighting Factors Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1.010 1.020 1.035 1.035 1.040 1.040 1.015 1.010 1.008 1.006 1.005 1.007

10/01/67 - 09/30/08 USGS 14337600 Observed flow of 14337600 (Rogue River near McLeod) minus observed USGS 14337500 flow of 14337500 (Big Butte Cr near McLeod) times the monthly weighting

factors shown below: Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 0.992 0.984 0.973 0.973 0.969 0.969 0.988 0.992 0.994 0.996 0.997 0.995

LOS5S 02/18/77 - 9/30/08 USGS 14335040 Reservoir elevations from USGS 14335040 and capacity table LOS.CAPUSACE Dataquery Dataquery used for bad USGS data from 26 Jan - 3 Apr 2003

LOS5A 07/01/28 - 09/30/08 LOS_H + LOS_S

Lost Creek Dam; DA=674

158.4

Rogue River

(14328000) Rogue R. ab Prospect; DA =312; Jul 28-Sep 98173.4

160.4

154.0

0.6155.3

(14337500) Big Butte Cr. nr McLeod; DA =245; Oct 45-Sep 57; Oct 67-Sep 08

(14335000) Rogue R. bl SF Rogue R. nr Prospect; DA =650; Oct 28-Sep 65

(14337600) Rogue R. nr McLeod; DA =938; Oct 65-Sep 08

Big Butte Creek

Western Oregon Basin (Section 3.9)

Page B-91

"A" CANAL"A" CANAL DIVERSION 11507200 (ACL)

river mile 43.2 Drainage Area: 572 Sq. Mi.

Site Period Source Comments

ACL5H 07/01/28 - 09/30/81 USGS 11507200 Observed flow of USGS 11507200 (A Canal at Klamath Falls)

10/01/81 - 09/30/08 USBR - Klamath Falls Daily flows provided by USBR Klamath Falls office

Link River Dam; DA=3810254.3

Klamath River

254.1 (11507500) Link R. @ Klamath Falls; DA =3810; Jul 28-Sep 08

(11507501) Link R. & Keno Canal nr Klamath Falls; DA =3810; Jul 28-Sep 83

(11507200) “A” Canal @ Klamath Falls; Jul 28-Sep 81

“A” Canal

Upper Klamath Lake

Link River

Westside “Keno” Canal

Western Oregon Basin (Section 3.9)

Page B-92

KLAMATH RIVERLINK R. 11507500 (LNK)

river mile 254.3 Drainage Area: 3810 Sq. Mi.

Site Period Source Comments

LNK5H 07/01/28 - 09/30/83 USGS 11507501 Observed flow of USGS 11507501 (Link River and Keno Canal nr Klamath Falls)

10/01/83 - 09/30/08 USGS 11507500 & Observed flow of 11507500 (Link R @ Klamath Falls) plus Westside Keno CanalPacifiCorp from PacifiCorp

KLA5S 07/01/28 - 09/30/08 USGS 11507001 Reservoir elevations from USGS 11507001 (Upper Klamath Lake nr K.Falls

LNK5A 07/01/28 - 09/30/08 LNK_H + KLA_S + ACL_H

ACL5H 07/01/28 - 09/30/08 USBR - Klamath Falls Daily flows provided USBR Klamath Falls Office

Link River Dam; DA=3810254.3

Klamath River

254.1 (11507500) Link R. @ Klamath Falls; DA =3810; Jul 28-Sep 08

(11507501) Link R. & Keno Canal nr Klamath Falls; DA =3810; Jul 28-Sep 83

(11507200) “A” Canal @ Klamath Falls; Jul 28-Sep 81

“A” Canal

Upper Klamath Lake

Link River

Westside “Keno” Canal

Western Oregon Basin (Section 3.9)

Page B-93

KLAMATH RIVERJOHN C BOYLE 11510600 (JCB)

river mile 224.7 Drainage Area: 4080 Sq. Mi.

Site Period Source Comments

JCB5H 07/01/28 - 09/30/29 USGS 11507501 Semi-monthly flow values from 1990 modifed flow study shaped to daily flowof USGS 11507501

10/01/29 - 09/30/60 USGS 11509500 Flows derived from a correlation between Q1 11510700 (Klamath R. Bl. John C.USGS 11510700 Boyle Powerplant nr Keno) plus John C. Boyle change of storage and Q2 11509500

(Klamath R. at Keno).Q1 = a*Q2 + b Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sepa 0.96002 0.92842 0.95792 0.99095 0.98823 0.99531 0.9696 1.00667 1.03402 0.95068 0.96437 0.98615b 267.428 318.114 278.563 221.156 219.543 206.236 299.05 265.038 244.443 268.868 266.665 247.376

10/01/60 - 09/30/08 USGS 11510700 Observed flow of 11510700 (Klamath R. bl. John C. Boyle Power Plant)

JCB5S 03/01/62 - 12/31/62 1990 mod flow study Semi-monthly flow values from 1990 modifed flow study

01/01/63 - 09/30/08 PacifiCorp Daily change of content from PacifiCorp

JCB5A 07/01/28 - 09/30/08 JCB_H + JCB_S + KLA_S + ACL_H

John C. Boyle Dam; DA=4080224.7

Klamath River

(11507501) Link R. & Keno Canal nr Klamath Falls; DA =3810; Jul 28-Sep 83254.1

232.1

219.6

(11509500) Klamath R. @ Keno; DA =3920; Oct 29-Sep 08

(11510700) Klamath R. bl John C. Boyle Powerplant nr Keno; DA =4080; Jan 59-Sep 08

209.3 ORCA

Western Oregon Basin (Section 3.9)

Page B-94

Appendix C – Calculating Depletions (D): Details Depletions are defined as:

Di = da * (ΔI) where Di = incremental depletion, cfs da = depletion per unit area, cfs/1000 acres ΔI = incremental irrigated acres, 1000 acres da Depletion values are initially calculated as flow per unit area (cfs per 1000 acres), and vary according to the methods of irrigation used in a subarea – either sprinkler or gravity application. They vary because of the different application efficiencies of these two methods. Depletions were calculated on a monthly time-step because the data for the amount of water required by the various crop types was available on a monthly time-step.

Depletion (cfs) = Diversion (cfs) + Return Flow (cfs) Diversion is a negative value that denotes the amount of water removed from the river for irrigation. Return Flow is a positive value that denotes the amount of water unused by the crops which is returned to the river. Diversions for crop irrigation usually occur between April and October each year, whereas returns to the river occur throughout the year. In most locations, during the months of May through September, the amount diverted from the river is typically more than the amount returned, and therefore the depletion values will be negative for these months. The depletions values (cfs per 1000 acres) are then multiplied with the incremental irrigated acreage to produce incremental depletions in cfs. All calculations for finding irrigation depletions, are made on a subarea basis, and are monthly values which are later converted to daily values. The Columbia River Basin was divided into subareas where depletions per unit area can be considered uniform. The depletion per unit area can be estimated from the water requirements of the various crops in the subarea and the method that the water is delivered to the crops. A wide range of crops are grown in the Columbia basin ranging from grapes to potatoes and each crop requires a different amount of water. This amount of water, the crop consumptive use, is estimated using the Irrigation Water Requirement (IWR) program from the National Resource Conservation Service (NRCS).

Page C-1

However, a larger amount of water than required by the crops must be withdrawn because water is lost via evaporation, deep groundwater percolation, nonproductive vegetation or runoff as it is applied to the field. Water is generally applied to fields in two methods: sprinkler irrigation or gravity irrigation. The sprinkler method uses pipes or nozzles operated under pressure to form a spray pattern. The gravity or flood irrigation method applies water directly to the field which is then distributed by gravity. ΔI Since the observed flows in a specific year naturally include the level of irrigation occurring at the time, it is only necessary to calculate how irrigated acres have changed from that year to the current year (ΔI). Multiplying ΔI by da then gives an incremental depletion that adjusts a specific year’s flow to a flow that would have been observed with the current amount of irrigated acres.

C.1 Define Subareas The first step in calculating irrigation depletions is to divide up the Columbia Basin into smaller sections for analysis. The division was made based on drainage area boundaries such that each section is assumed homogeneous or similar in geographic characteristics. The division of the basin into subareas was done differently for the United States versus Canadian portions of the basin because of the different types of data available in each country.

C.1.1 United States Subareas The United States portion of the Columbia basin is divided into subareas based on drainage area/watershed boundaries. Irrigated acreage data is available on a county by county basis. Because subarea boundaries are not identical to county boundaries, it is necessary to determine the portion of each county’s irrigated acres that is contained within each subarea. For example if a subarea is made up of five counties, and two of them did not have any irrigation, the percentage contribution of irrigated acreage from those two counties would be zero. The other three counties would each contribute irrigated acreage to the subarea. However irrigated acreage within a county should not be confused with the total acreage of the county. For example, assume one of the three counties was 1000 acres, but only 800 of those acres were irrigated. If only 400 of those 800 acres are within the subarea, then the percentage contribution of irrigated acreage from that county is 50%. This percentage is herein referred to as “county irrigated acreage percentage.” In the previous studies, the subarea delineations, and county irrigated acreage percentages were obtained from the Columbia River Water Management Group (CRWMG 1980). Because there was no digital form of the subarea map from the 1980 study, and because the county irrigated acreage percentages from 1980 study were likely outdated, it was decided to digitize the subarea map and to update the county irrigated acreage percentages. The following sections describe the digitizing of the subarea map, and

Page C-2

updating of the county irrigated acreage percentages. Details regarding the sub-dividing of certain subareas are also discussed.

C.1.2 Digitizing of Subarea Map The goal of digitizing the subareas is to create updated values of each county’s percent of total irrigated land that falls within a larger subarea. The original subareas are shown in a map published by the CRWMG (1980). Since there was no digital form of this map, HUC-8 basins defined by the USGS were combined to form similar subareas (Figure C-1, Table C-1). In the process of digitizing the subareas, certain subareas were redefined and organized a little differently than they were previously. For this reason, some subarea data cannot be compared with data from previous studies.

Figure C-1. Map of United States Subareas

Page C-3

Table C-1. List of United States Subareas

Subarea Identifier

Subarea 1 Bitterroot BIT Subarea 2 Upper Clark Fork UCF Subarea 3 Lower Clark Fork LCF Subarea 4a Upper Flathead FLT Subarea 4b Flathead Irrigation District FID Subarea 5a Kootenai-Idaho KID Subarea 5b Kootenai-Montana KMT Subarea 6 Pend Oreille US PEN Subarea 7 Spokane SPV Subarea 8 Ferry-Stevens FER Subarea 9 Methow-Okanagan OKM Subarea 10 Chelan-Entiat-Wenatchee-W Banks Lake CEW Subarea 12 Yakima YAK Subarea 26 Grande Ronde at Wenaha WEN Subarea 27 Upper Salmon UPS Subarea 28 Lower Salmon LWS Subarea 29 Clearwater CLR Subarea 30 Palouse-Lower Snake PLS Subarea 31 Walla Walla WWA Subarea 32a(1) Pumping from McNary to Umatilla UMP Subarea 32a(2) Return flow from McNary pumping to Umatilla UMR Subarea 32b Pumping from John Day to Morrow & Gilliam co. & Returns JDP Subarea 32c Umatilla River & Willow Creek UMW Subarea 33 John Day JDA Subarea 34b Deschutes - White River Wapanita Project WHT Subarea 35a Hood River HOD Subarea 35b White Salmon WHS Subarea 36a(1) Pumping from McNary to Northside NSM Subarea 36a(2) Return flow from McNary pumping to Northside NSR Subarea 36b Pumping from John Day to Northside + Returns NSJ Subarea 36c Klickitat KLC Subarea 38 Willamette WMT Part of 38 Fern Ridge FRN

The numbers used to identify the various subareas are obtained from CRWMG (1980). Certain subareas were partitioned into “a” and “b” to better represent certain irrigation areas, as explained in Section C.1.2.2.

C.1.2.1 County Irrigated Acreage Percentages Spatially distributed irrigated land use for the United States was obtained from the Food and Agricultural Organizations of the United Nations (FAO, 2011) AQUASTAT group. The AQUASTAT group generated distributed irrigated land use by first gathering county level data from the USGS and USDA inventories on irrigated area per county for the years 1995, 1997, 2000, and 2002. The maximum value of irrigated land from the inventory was then used to represent the amount of area equipped for irrigation in the county. A 30m resolution land cover data set was used to downscale the county level

Page C-4

irrigation data to a grid at 5 minute resolution. Each county’s irrigated area was divided equally amongst pixels defined as orchards and vineyards, row crops, small grains or fallow. If the sum of these pixel areas were smaller than the county level irrigated area, the remaining area was assigned to pixels defined as pasture and hay. The resulting downscaled data for the Columbia Basin, Puget Sound and Washington and Oregon Coastal Basins is shown below.

Figure C-2. Map of Irrigated Acres within the United States Produced by the University of Frankfurt for the Food and Agricultural Organizations of the United Nations. For each subarea, the percent contribution of each county was calculated as follows:

CP = 100%*(Irrsa / Irrtot)

where CP is the percent contribution of irrigated land within the county to the subarea (%), Irrsa is the irrigated land of the target county that falls within the subarea (hectares), and Irrtot is the total irrigated land in the target county (hectares). For example, here is the breakdown of the percentage contribution of irrigated lands of the counties that make up the “Lower Clark Fork” subarea (subarea 3):

Page C-5

- 4.4% of Bonner County in ID - 100% of Mineral County in MT - 40.7% of Missoula County in MT - 29.8% of Sanders County in MT Lower Clark Fork is used as an example in the rest of this section to explain the calculations that lead up to the determination of the final depletion values for Lower Clark Fork basin. For more details about other subareas, refer to Appendix D of this report where information by river basin is provided.

C.1.2.2 Subarea Partitioning Certain subareas were further partitioned into “a” and “b” to better represent certain irrigation areas, either because of differences in climate and geology, or due to different locations along the river where the irrigation depletions are applied. Subarea 4 was partitioned into two sections: (a) Upper Flathead and (b) Flathead Irrigation District. Of the four counties in Montana that lie within subarea 4 – Flathead, Lake, Sanders and Missoula – the portion of land within Flathead county makes up part (a), and the portions within Lake, Sanders and Missoula counties make up part (b). Basically the irrigation north of Flathead Lake behind Kerr dam is part (a) and south of South of Kerr dam is part (b). Subarea 5 was partitioned into two sections: (a) Kootenai-Idaho and (b) Kootenai-Montana. The splitting was done according to the counties in subarea 5 that are within Idaho vs. Montana. The depletions from each of these sections were applied at different points in the river. Subarea 34 was partitioned into two sections: (a) Deschutes – South Portion and (b) Deschutes – White River Wapanita. The south portion of the Deschutes basin, 34(a), has extensive irrigation that is accounted for in the special studies done by the USBR (Supplemental Report), and do not follow the methodology discussed in this Appendix. The north portion of the Deschutes basin is where the downstream reach of the Deschutes River joins the Columbia River. A major tributary that joins the Deschutes River in this reach within Sherman County is the White River Wapanita, which includes the Wapanita Irrigation District. The northern two counties (Sherman and Wasco) make up part (b) while the rest of the counties in Subarea 34 make up part (a). Subarea 35 was partitioned into two sections: (a) Hood River and (b) White Salmon. The portion of the subarea south of the Columbia River makes up part (a), and the portion north of the river makes up part (b). In all of the above mentioned subareas (3, 5, 34 and 35) the crop acreage data collected, as well as the climate data used to determine the crop water requirement are different for each of the portioned sections.

Page C-6

The partitioning of subareas 32 and 36 is slightly different from the above discussed subareas because the crop acreage data and climate data used in them are not different in each of their partitioned sections. These two subareas include areas irrigated via pumping from McNary and John Day reservoirs. The pumping and the resulting return flows are discussed in more detail in Section 4. Subarea 32 was portioned into three sections: (a) Pumping from McNary to Umatilla + Returns, (b) Pumping from John Day to Morrow & Gilliam counties + Returns and (c) Umatilla River and Willow Creek. The total irrigated acreage within subarea 32 was divided according to the following historically used percentages: 25%, 50% and 25% for parts (a), (b) and (c) respectively. Subarea 36 was also partitioned. The irrigation depletions in most of subarea 36 are calculated as detailed in this appendix. However, there is a small section of subarea 36, the Kennewick irrigation area, where depletions are determined differently. The Kennewick depletions are discussed in Section 3.6. The acreage within subarea 36 where depletions are calculated as per this appendix is the total acreage of subarea 36 minus Kennewick irrigation acreage. This remainder acreage is then partitioned into three sections – (a) Pumping from McNary to Northside + Returns, (b) Pumping from John Day to Northside + Returns and (c) Klickitat according to the following historically used percentages – 55%, 24% and 21% for parts (a), (b) and (c) respectively.

C.1.3 Canadian Subareas The map below (Figure C-3), provided by Statistics Canada, shows the sub-basins of the Columbia River watershed in Canada. Each basin is given a “08N” identifier as per the naming system used in Statistics Canada. Some of the 08N basins were combined for the purposes of calculating total irrigation depletions at a modified flow point. For example, the tributary area of the Columbia basin above Mica Dam contains three subareas (08NA, 08NB and 08NC) that were summed to determine the irrigated area above Mica Dam. The table below the map (Table C-2) identifies the defined subareas.

Page C-7

Figure C-3. Map of Canadian Subbasins Table C-2. List of Canadian Subareas

Subareas as defined in this study 08N basins Identifier

Upper Columbia above Mica 08NA + 08NB + 08NC UPC

Hugh Keenleyside 08ND ARD

East Kootenay above Newgate 08NG + 08NK + 08NP EKO

West Kootenay - International border to Corra Linn 08NH WKO

Brilliant 08NJ BRI

Columbia at Trail 08NE CTR

Pend O’Reille in Canada n/a POC

Okanagan in Canada 08NL + 08NM OKA

Kettle 08NN KET

Statistics Canada provided the 2006 Canadian Census of Agriculture irrigated acreage data for each of the 08N basins, which was then scaled (explained further in Section C.2.2) and combined according to the subarea definitions in the above table. Note: The ‘Pend Oreille in Canada’ subarea denotes irrigated acreage within the Pend Oreille basin that lies within Canada. Irrigated acreage in this subarea is very small, and due to lack of new data, was assumed to be the same as in the last study (about 1,100 acres). Because it constitutes such a small area it was not delineated but it is contained within Subarea 08NE.

Page C-8

C.2 Irrigated Acres in a Subarea Irrigation acreage data in the United States and Canada were obtained from several sources. The total irrigated acreage per subarea, and a breakdown of that acreage by individual crop types, was collected from these sources with the purpose of calculating the percentage irrigated land contribution by each crop type in a given subarea. This percentage breakdown is later used in determining how much water is required by each of these crops for every subarea.

C.2.1 United States Irrigated Acres For more than 150 years, the U.S. Department of Commerce, Bureau of the Census, conducted the Census of Agriculture. However, the 1997 Appropriations Act transferred the responsibility from the Bureau of the Census to the U.S. Department of Agriculture (USDA), National Agricultural Statistics Service (NASS). The USDA Census of Agriculture is the leading source of statistics for the nation’s agricultural production and has data at the county, state, and national levels. Census statistics are used by Congress to develop and change farm programs, study historical trends, assess current conditions, and plan for the future. The first agriculture census was taken in 1840. The agricultural census is now taken on a 5-year cycle collecting data for years ending in a “2” and “7”. For this modified flow study the USDA 2007 Census of Agricultural Report [available on line at: http://www.agcensus.usda.gov] is used along with the USGS 2005 water use data. The USDA dataset provides irrigated acreage by individual crop types within each county, whereas the USGS dataset does not. Therefore, most of the individual crop data was obtained from USDA, while total irrigated acres were sometimes used from them USGS dataset. The USGS dataset provides information on surface water versus groundwater irrigation, which the USDA does not. Thus a combination of both these sources was used in this study. Individual crop acreage data from the USDA website is available by state and is broken down by counties. Since the crop data is available by county, the counties that make up the Lower Clark Fork subarea were first determined. Using GIS, it was found that the following counties and percentages make up the Lower Clark Fork subarea: - 4.4% of Bonner County in ID - 100% of Mineral County in MT - 40.7% of Missoula County in MT - 29.8% of Sanders County in MT The crop data for each of these counties were obtained from two different tables in the 2007 Agricultural census. From Table 10, “Irrigated Harvested Cropland” and “Irrigated Pastureland” were used. The category “Irrigated Harvested Cropland” contains data of the total cropland. It does not have a breakdown of the acreages by individual crop type. Table 25 from the census includes this breakdown by crop type, and has data for 10

Page C-9

different types of crops. “Irrigated Pastureland’ data is found in Table 10 and not in Table 25 because the census does not categorize pasture as a type of crop. However for this dataset, pasture data was taken into account because it uses significant amounts of irrigation water. The USGS also publishes irrigated acre information by county (USGS 2005b) [available on line at: http://water.usgs.gov/watuse/data]. Irrigated area for both sprinkler and flood irrigation are provided along with estimates of surface water and groundwater withdrawals, which are used and described later in this appendix. The 2005 USGS data was compared and used in addition to the 2007 USDA census data. The USGS values for total irrigated acreages are different from the USDA’s “Irrigated Harvested Cropland” values because they were collected in a different year (2005 versus 2007), and by different methods. Because reported acreages are underestimates most of the time, the higher of the USDA and USGS total irrigated cropland values were used to more closely represent actual irrigation acreage. The table below shows the raw irrigated crop acreage data collected. Not every county has all ten types of crops, or the same types of crops. However all crop types are displayed even if no acres were allocation for the particular crop, so as to show the total list of available crop data. Table C-3. Irrigated Crop Acreage by County within Lower Clark Fork Subarea

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders

USDA Table 10 Irrigated Pastureland 380 809 4,387 5,288Barley 0 0 0Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 1,510 507 11,140 10,838Oats 28 0 0 0Sugar Beet 0 0 0Wheat 0 0 762Small Vegetables 4 0 50 31Orchards w Cover 13 0 11 19Sum of Table 25 1,555 507 11,963 11,163

Higher of USDA or USGS

Total Irrigated Cropland 1,678 533 12,168 11,576

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93% 95% 98% 96%

Acres

USDA Table 25

0000

0275

As shown in Table C-3 above, the total acreage of all the individual crop types from the 2007 USDA Ag Census Table 25 does not equal the total irrigated cropland acreage. This may be because of miscellaneous crop types that are not included in the tabulations. To ensure that all the irrigated acreage is accounted for, the aggregated crop acreage (sum of 2007 USDA Ag Census Table 25) divided by the total irrigated cropland (higher of USDA or USGS) is calculated to yield a percentage (scaling factor) as shown in the table. This percentage is then used to scale up the individual crop acreages. Note: the Irrigated Pastureland data from 2007 USDA Ag Census Table 10 is not used in this scaling, but is

Page C-10

shown because it is included as a type of crop. Table C-5 shows the results after the individual crop acreage values from each county have been scaled up to match the total irrigated cropland values, and also after the appropriate percentage of that county’s irrigated land contributing to the subarea has been accounted for. Table C-4. Percent of County Irrigated Acreage within Lower Clark Fork Subarea

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders

County Contribution to subarea

4.4% 100.0% 40.7% 29.8%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Table C-5. Percent Distribution of Crop Types within Lower Clark Fork Subarea

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders Total Acres Percent

Barley 0 0 0 0 0Corn for Grain 0 0 0 0 0Corn for Silage 0 0 0 0 0Dry Beans 0 0 0 0 0Alfalfa Hay 72 533 4,612 3,349 8,566 64.9%Oats 1 0 0 0 1Sugar Beet 0 0 0 0 0Wheat 0 0 315 85 400 3.0%Small Vegetables 0 0 21 10 30 0.2%Orchards w Cover 1 0 5 6 11 0.1%Pasture 17 809 1,786 1,576 4,187 31.7%

Irrigated Acres per county within the subarea.

For example, note Alfalfa Hay acreage in Bonner County, ID (Table C-3):

Acreage value from 2007 USDA Ag Census Table 25 = 1510 acres Scaled up = 1510 acres / 0.93 = 1623.6 acres

The total irrigated cropland (higher of USDA/USGS) in Bonner County is 1678 acres, of which Alfalfa Hay now represents 1623.6 of after scaling. The remaining 54.4 acres is made up of the other lesser acreages crops: oats, vegetable and orchard.

Since Bonner County contributes only 4.4% of it’s irrigated land area to the Lower Clark Fork subarea, total acreage of Alfalfa Hay in Lower Clark Fork from Bonner County = 1623.6 acres * 0.044 = 72 acres.

The calculation assumes that the spatial distribution of irrigated crop types within a county is uniform. Thus it was assumed that if 4.4% of the irrigated land in Bonner County lies within the Lower Fork subarea, 4.4% of the Alfalfa Hay, and 4.4% of the oats, etc, lie within the subarea. Calculations similar to this were made with all crop types for each contributing county. Then a total acreage of each type of crop within the subarea was calculated. From these total crop acreages, the percentage of each type of crop within the subarea was computed,

Page C-11

as shown in the far right column in Table C-5 above. These crop percentages are used later in Section C.3.2 to calculate the total irrigation volume requirement. The data tables within Section C.2.1 can be found in Appendix D.3 for all the other subareas.

C.2.2 Canadian Irrigated Acres The irrigation and crop data for British Columbia was obtained from two sources: Statistics Canada, 2006 Census of Agriculture, and from data compiled by the British Columbia Ministry of Agriculture and Lands. Statistics Canada obtains information via census taken from farm owners in British Columbia. Although all geographical areas of interest were surveyed by the census, not all farmers report their crop acreage values and the farmers that do report are allowed to make only partial disclosure of what they are growing. This causes the acreage values provided by Statistics Canada to be under-representative of actual irrigation. The Ministry obtains crop acreage information by aerial surveys, and their acreage values are usually larger and thought to be more accurate than the data provided by Statistics Canada. However, the Ministry does not collect data for all areas of interest. To best represent the actual irrigation acreage, the Statistics Canada data was compared to the Ministry at a location where data was available from both sources– the Okanagan subarea. The Okanagan data comparison showed that the Statistics Canada data should be scaled up by 25% (scaling factor of 1.25) to more accurately represent actual irrigation. In the 2000 Modied Streamflows study the scaling factor was 2.0. Because there is a considerable amount of farming in the Okanagan basin, the comparison was considered to be a good representation of how the two datasets would relate for the rest of the Canadian portion of the Columbia Basin. Therefore, the Statistics Canada data for all subareas in British Columbia were scaled up by 25 % for the analysis. Unlike the extensive crop data collected for the United States portion of the basin, only crop types that had significant acreage within a subarea was collected. More details on the various types of crop data collected for each of the Canadian subareas can be found in Appendix D.2.1, D.2.2 and D.2.3.

C.3 Crop Water Requirement Many factors influence the amount of irrigation water required by crops. The most significant are: (1) climate, (2) available water supply or soil moisture, (3) plant growth characteristics, and (4) agricultural practices. The climate factors influencing water requirements, particularly evapotranspiration are: (1) solar radiation, (2) precipitation, (3) temperature, (4) humidity, and (5) wind. The most significant climatic factor affecting evapotranspiration is solar radiation because it is the source of energy necessary to transfer water from a liquid to the vapor phase in plants and soil. It is not practical to directly determine the water requirements information by local field measurements.

Page C-12

Consequently, for planning purposes, theoretical methods are employed to quantify these important parameters. In areas where few or no measurements of crop consumptive uses are available, it is necessary to estimate them. For this study, the Irrigation Water Requirement (IWR) program was used to estimate the amount of water required by each type of crop type in every subarea. IWR is a crop consumptive use program developed for the USDA-NRCS. The Irrigation Water Requirements (IWR) program (NRCS, 2003) is an implementation of certain procedures for computing monthly and seasonal irrigation water requirements. The procedures are as detailed by the NRCS (1993). Evapotranspiration calculations are the basis from which irrigation water requirements are calculated. This program alternatively uses one of three procedures to calculate monthly average evapotranspiration. The three methods are 1) Temperature method, 2) Radiation method, and 3) Soil Conservation Service SCS BC-TR21 method (SCS, 1967) which is based on the Blaney-Criddle Method (Blanley and Criddle, 1950). Determining which one to use is dictated by the climatic data available and by the characteristics of the region where the procedure is to be used. For this study, the SCS BC-TR21 method was used within IWR. The IWR program requires climatological data (e.g. latitude, longitude, elevation, average annual precipitation and temperature) as input to the SCS BC-TR21 method. Thus representative climatological stations were chosen for each subarea to provide the necessary climatological data. The data from these stations represent the average climate conditions in the basin over a 30-year period from 1971 through 2000. The list of climatological stations chosen for each subarea is shown in Table C-6.

Page C-13

Table C-6. Climatological Stations used in IWR ID Climatalogical Station State

UPC Canada Upper Columbia above Mica Revelstoke AP BCARD Canada Hugh Keenleyside Castlegar AP BCEKO Canada East Kootenay Cranbrook AP BCWKO Canada West Kootenay Castlegar AP BCBRI Canada Brilliant Castlegar AP BCCTR Canada Columbia at Trail Castlegar AP BCPOC Canada Pend Oreille in Canada Castlegar AP BCOKA Canada Okanagan Princeton AP BCKET Canada Kettle Castlegar AP BCBIT Subarea 1 Bitterroot Hamilton MTUCF Subarea 2 Upper Clark Fork Deer Lodge 3 W MTLCF Subarea 3 Lower Clark Fork Missoula WSO AP MTFLT Subarea 4a Upper Flathead Kalispell WSO AP MTFID Subarea 4b Flathead Irrigation District Polson-Kerr Dam MTKID Subarea 5a Kootenai-Idaho Bonners Ferry IDKMT Subarea 5b Kootenai-Montana Eureka R.S. MTPEN Subarea 6 Pend Oreille US Priest River EXP STN IDSPV Subarea 7 Spokane Spokane WSO AP WAFER Subarea 8 Ferry-Stevens Chewela WAOKM Subarea 9 Methow-Okanogan Conconully WACEW Subarea 10 Chelan-Entiat-Wenatchee-

W Banks LakeWenatchee WA

WEN Subarea 26 Grande Ronde La Grande ORUPS Subarea 27 Upper Salmon Salmon KSRA IDLWS Subarea 28 Lower Salmon Riggins IDCLR Subarea 29 Clearwater Dworshak Fish Hatchery IDPLS Subarea 30 Palouse-Lower Snake Lewiston WSO AP ID

WWA Subarea 31 Walla Walla Whitman Mission WAmultiple Subarea 32 Umatilla Pendleton BR EXP STN OR

JDA Subarea 33 John Day John Day ORWHT Subarea 34 Deschutes - White River

Wapanita ProjectBend OR

HOD Subarea 35a Hood River Hood River EXP STN ORWHS Subarea 35b White Salmon Mount Adams Ranger STN OR

WMT Subarea 38 Willamette Eugene WSO Airport ORFRN Part of 38 Fern Ridge Fern Ridge Dam OR

multiple WA

Subarea

Subarea 36 Northside McNary Dam (36a, 36b) & Glenwood 2 (36c)

C.3.1 Monthly Requirement Per Crop Based on the data from the climatological stations, the IWR program computes the water required for each crop every month of a year, in inches. An example for the crop type ‘Alfalfa Hay’ in the Lower Clark Fork subarea is in Table C-7.

Page C-14

Table C-7. Example Output from IWR of Water Required by Alfalfa Hay in Lower Clark Fork Subarea

The irrigation requirement values, in inches, were taken from the “Normal Year 50% Chance (1)” column shown in Table C-7. In the case of the Lower Clark Fork subarea, apart from the above shown Alfalfa Hay, irrigation requirements were also found in IWR for the other crop types in the subarea: combined grains, small vegetables, orchards with cover, and pasture. These individual crop irrigation requirement values are later used to

Page C-15

calculate the annual volume of water required for irrigation (Section C.3.2) and also the distribution of monthly diversions (Section C.5).

C.3.2 Annual Requirement per Subarea The annual water requirement per subarea is calculated by adding the weighted yearly water requirement of each crop in that subarea according to the percent distribution of that crop type. The yearly water requirement per crop can be found by adding up the monthly requirement discussed in the previous step. The yearly requirements for the crops in Lower Clark Fork are shown in Table C-8, including Alfalfa water requirement values from Table C-7. Table C-8. Yearly Water Requirement (inches) of the Various Crops within Lower Clark Fork Subarea

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover PastureRequirement Requirement Requirement Requirement Requirement

(Inches) (Inches) (Inches) (Inches) (Inches)JANFEBMARAPR 0.12MAY 1.67 1.53 1.54 2.27JUN 5.35 4.74 1.54 4.74 3.76JUL 5.62 6.64 4.64 6.64 5.45AUG 0.14 5.59 3.89 5.59 4.71SEP 1.97 0.3 1.97 2.4OCT 0.14NOVDECTotal 12.78 20.47 10.37 20.48 18.85 Based on the yearly water requirement of each crop, as well as the percentage of each of those crops in a subarea, the total volume of irrigation water required in a subarea can be calculated as outlined below: Alfalfa hay was found to make up 64.9% of the Lower Clark Fork subarea, and has an annual water requirement of 20.47 inches. Similarly, wheat was found to make up 3.0% of the subarea, and has an annual water requirement of 12.78 inches. The water requirements for these and the remaining crops within the lower Clark Fork subarea are shown in Table C-9.

Page C-16

Table C-9. Annual Irrigation Requirement (ac-ft per 1000 ac) within Lower Clark Fork Subarea

Combined Grains

Alfalfa Hay

Small Vegetables

Orchards w Cover

Pasture Total

Irrigated Acres (%) 3.00% 64.90% 0.20% 0.10% 31.70% 100%Required water (in) 12.78 20.47 10.37 20.48 18.85Required water (ft) 1.1 1.7 0.9 1.7 1.6

Req. volume (ac-ft per 1000 ac)

32 1107 2 1 498 1642

Using Alfalfa Hay as an example: The required water in inches is converted to feet: Required water (ft) = 20.47” / (12”/ft) = 1.7 ft The required volume of water for Alfalfa is found by factoring in its percentage land

contribution within the subarea: Required volume of water = 1.7 ft * 64.9% *1000 = 1107 ac-ft/1000 acres Similar calculations were made for the other types of crops, and the total required volume in the Lower Clark Fork subarea is then determined to be 1642 ac-ft per 1000 acres. The data tables within C.3.2 can be found in Appendix D.4 for all the other subareas.

C.4 Irrigation Methods and Efficiency There are two main irrigation methods used in the Columbia basin: sprinkler, and gravity, and they each have different irrigation efficiencies. On-farm losses must be included in calculating the total water requirement. These on-farm losses include: (1) deep percolation due to non-uniform application; (2) field runoff because of inadequate facilities and/or poor management; (3) evaporation, particularly in the case of sprinkler application; and, (4) farm distribution system losses as from ditches used in surface irrigation. The total amount of water required is estimated by dividing the crop irrigation requirement by irrigation efficiency. Sprinkler and gravity irrigation methods have different diversion and return flow efficiency percentages. Each subarea may have a different set of percent efficiencies for both irrigation methods. Table C-10 and Table C-11 show these percentage efficiencies for all subareas. The percentage efficiencies for the subareas within United States were obtained from the 1980 Modified Flow Report. For Oregon, Washington, and Idaho, the efficiencies were obtained from King, et al. (1980). For Montana the values were obtained from a Soil

Page C-17

Conservation Service report on irrigation efficiency (SCS, 1976) The work in these two cited references was based on actual measurements and included annual diversion requirements for both gravity and sprinkler methods of water application. For the Canadian subareas, gravity and sprinkler efficiencies were not provided by Statistics Canada, and were therefore assumed to be the same for the 2010 study as the 2000 study. Table C-10. Diversion Sprinkler and Gravity Efficiency (%)

Sprinkler (%) Gravity (%)Canada Upper Columbia above Mica 63 50Canada East Kootenay 63 50Canada West Kootenay Int’l Border to Corra Linn 63 50Canada Keenleyside to Pend Oreille 63 50Canada Slocan 63 50Canada Pend Oreille 74 50Canada Kettle 63 50Canada Okanagan 63 50Subarea 1 Bitterroot 67 50Subarea 2 Upper Clark Fork 67 50Subarea 3 Lower Clark Fork 68 50Subarea 4a Upper Flathead 63 50Subarea 4b Flathead Irrigation District 63 50Subarea 5a Kootenai-Idaho 63 50Subarea 5b Kootenai-Montana 63 50Subarea 6 Pend Oreille US 74 50Subarea 7 Spokane 81 45Subarea 8 Ferry-Stevens 81 45Subarea 9 Methow-Okanogan 57 50Subarea 10 Chelan-Entiat-Wenatchee-W Banks Lake 55 50Subarea 26 Grande Ronde 86 45Subarea 27 Upper Salmon 67 50Subarea 28 Lower Salmon 66 50Subarea 29 Clearwater 76 50Subarea 30 Palouse-Lower Snake 76 50Subarea 31 Walla Walla 80 50Subarea 32a & b Pumping from John Day & McNary to south 75 50Subarea 32c Umatilla River & Willow Creek 90 45Subarea 33 John Day 78 50Subarea 34 Deschutes - White River Wapanita Project 50 50Subarea 35a Hood River 84 45Subarea 35b White Salmon 50 50Subarea 36a & b Pumping from John Day & McNary to north 75 50Subarea 36c Klickitat 50 50Subarea 38 Willamette 76 50Part of 38 Fern Ridge 76 50

Diversion Percentage EfficiencySubarea

Page C-18

Table C-11. Return Flow Sprinkler and Gravity Efficiency (%)

Sprinkler (%) Gravity (%)Canada Upper Columbia above Mica 33 45Canada East Kootenay 33 45Canada West Kootenay – Int’l Border to Corra Linn 33 45Canada Keenleyside to Pend Oreille 33 45Canada Slocan 33 45Canada Pend Oreille 22 45Canada Kettle 33 45Canada Okanagan 33 45Subarea 1 Bitterroot 29 45Subarea 2 Upper Clark Fork 29 45Subarea 3 Lower Clark Fork 28 45Subarea 4a Upper Flathead 33 45Subarea 4b Flathead Irrigation District 33 45Subarea 5a Kootenai-Idaho 33 45Subarea 5b Kootenai-Montana 33 45Subarea 6 Pend Oreille US 22 45Subarea 7 Spokane 16 50Subarea 8 Ferry-Stevens 16 50Subarea 9 Methow-Okanogan 39 45Subarea 10 Chelan-Entiat-Wenatchee-W Banks Lake 41 45Subarea 26 Grande Ronde 10 50Subarea 27 Upper Salmon 29 45Subarea 28 Lower Salmon 30 45Subarea 29 Clearwater 20 45Subarea 30 Palouse-Lower Snake 20 45Subarea 31 Walla Walla 16 45Subarea 32a & b Pumping from John Day & McNary to south 20 45Subarea 32c Umatilla River & Willow Creek 6 50Subarea 33 John Day 18 45Subarea 34 Deschutes - White River Wapanita Project 40 40Subarea 35a Hood River 12 50Subarea 35b White Salmon 40 40Subarea 36a & b Pumping from John Day & McNary to north 20 45Subarea 36c Klickitat 40 40Subarea 38 Willamette 20 45Part of 38 Fern Ridge 20 45

Return Flow Percentage EfficiencySubarea

The diversion percentage efficiencies (Table C-10) are used to compute the total amount of water to be diverted from the river to satisfy the crop water requirement calculated in the previous section. The return flow percentage efficiencies (Table C-11) were used to compute the amount of the diverted water that will be returned to the river as return flow.

Page C-19

Table C-12. Diversion and Return Flow Volumes (ac-ft per 1000 ac) within Lower Clark Fork Subarea based on Sprinkler/Gravity Efficiencies

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1642 1642

Diversion Efficiency (%) 68% 50%Required Diversion (ac-ft per 1000 ac) -2414 -3283Return Efficiency (%) 28% 45%Return Flow (ac-ft per 1000 ac) 676 1477 Example calculation: If sprinkler irrigation is used (efficiency: diversion = 68% & return flow= 28%) Volume of water diverted = Required Volume / Diversion Efficiency = -1642 ac-ft/1000 acres / 0.68 = -2414 ac-ft/1000 acres Volume of water returned = Volume of water to be diverted * Return Flow Efficiency = 2414 ac-ft/1000 acres * 0.28 = 676 ac-ft/1000 acres If gravity irrigation is used (efficiency: diversion = 50% & return flow= 45%) Volume of water diverted = Required Volume / Diversion Efficiency = -1642 ac-ft/1000 acres / 0.50 = -3283 ac-ft/1000 acres Volume of water returned = Volume of water to be diverted * Return Flow Efficiency = 3283 ac-ft/1000 acres * 0.45 = 1477 ac-ft/1000 acres These volumes of water are used to calculate the total flow to be diverted depending on what acreage within a subarea has been irrigated by sprinkler versus gravity. They are also used to calculate the portion of the diverted water that becomes return flow. The breakdown of what proportion of irrigated acreage in a subarea is irrigated by sprinkler vs gravity is presented later in Section C.8. The data tables within Section C.4 can be found in Appendix D.5 for all the other subareas.

C.5 Determine Diversion per Unit Area Diversion is based on the total amount of water required for the growth of various crops in a subarea as well as the percentage efficiency of the method of irrigation. Step 1: Determine the Monthly Diversion Distribution After the two different volumes (depending on sprinkler or gravity method) of water required for diversion per year in a subarea are calculated, the next step is to determine how much of that water is to be applied during the various months of the year. This is

Page C-20

what is referred to as “monthly diversion distribution.” The same distribution is used for both sprinkler and gravity diversion volumes. The monthly diversion distribution for a given subarea takes into account the following two factors: (a) The percentage of irrigated acreage made up by the various crop types; and (b) the water requirement of these crop types. Table C-13 shows the monthly diversion distribution for the Lower Clark Fork subarea. The calculations used to arrive at the values in the table are outlined below. Table C-13. Monthly Percent Distribution of Irrigation Diversion within Lower Clark Fork Subarea

Diversion Distribution

Cropland % 3.0% 64.9% 0.2% 0.1% 31.7% 100.0%

JANFEBMARAPR 0.12 0.6% 0.2%MAY 1.67 13.1% 1.53 7.5% 1.54 7.5% 2.27 12.0% 9.1%JUN 5.35 41.9% 4.74 23.2% 1.54 14.9% 4.74 23.1% 3.76 19.9% 22.7%JUL 5.62 44.0% 6.64 32.4% 4.64 44.7% 6.64 32.4% 5.45 28.9% 31.7%AUG 0.14 1.1% 5.59 27.3% 3.89 37.5% 5.59 27.3% 4.71 25.0% 25.8%SEP 1.97 9.6% 0.3 2.9% 1.97 9.6% 2.4 12.7% 10.3%OCT 0.14 0.7% 0.2%NOVDECTotal 12.78 20.47 10.37 20.48 18.85 100%

% spread over the

yearInches

% spread over the

yearInches %

Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover PastureWater Requirement Water Requirement Water Requirement

Example calculation: Diversion percentage for June = ∑ (Percentage of each crop type in subarea * Percentage of total annual water that crop

type requires in June) = (3.0%*41.9%) + (64.9%*23.2%) + (0.2%*14.9%) + (0.1%*23.1%) + (31.7%*19.9%) = 22.7 % Step 2: Determine the Monthly Diversion Volume per Unit Area The monthly diversion volumes per unit area were calculated for both sprinkler and gravity methods of irrigation using the annual required irrigation volume (Table C-12) and the diversion distribution (Step 1). The monthly diversion percentages are multiplied to the annual volumes for both sprinkler and gravity to get the monthly diversion volumes for each method of irrigation. Table C-14 shows these values for the Lower Clark Fork subarea.

Page C-21

Table C-14. Monthly Diversion Volume (Sprinkler/Gravity) per unit area within Lower Clark Fork Subarea

Diversion Sprinkler GravityDistribution ac-ft per ac-ft per

% 1000 ac 1000 acJAN 0 0FEB 0 0MAR 0 0APR 0.2% -5 -7MAY 9.1% -219 -298JUN 22.7% -548 -745JUL 31.7% -765 -1041AUG 25.8% -623 -847SEP 10.3% -249 -338OCT 0.2% -6 -8NOV 0 0DEC 0 0

-2414 -3283

DIVERSION

Annual Required Volume = Example calculation: Volume to be diverted per unit area in June if sprinkler was used = (Diversion Percentage for June) * (Volume of water diverted, sprinkler) = 22.7% * (-2414) ac-ft/1000 acres = -548 ac-ft/1000 acres Volume to be diverted per unit area in June if gravity was used = (Diversion Percentage for June) * (Volume of water diverted, gravity) = 22.7% * (-3283) ac-ft/1000 acres = -745 ac-ft/1000 acres

C.6 Determine Return Flow per Unit Area Depletion is the sum of diversion and return flow. Now that the monthly diversion per unit area has been determined, the next component to calculate is the return flow per unit area. In the previous section, the monthly diversion distribution was calculated based on the proportion of crops in a subarea and their water requirements. The monthly return flow distribution, on the other hand, is assumed to be the same as in the previous modified flows studies. This is because soil conditions, which is one of the main factors affecting return flows, do not vary significantly from year to year. The monthly distribution of return flows are, therefore, assumed not to vary from study to study. These return flow distributions may vary from subarea to subarea, just like with the diversion distributions. The return flow monthly distributions, as well as the monthly

Page C-22

return flow volume per unit area for the Lower Clark Fork subarea are shown in Table C-15 below. Table C-15. Monthly Return Flow Volume (Sprinkler/Gravity) per Unit Area within Lower Clark Fork Subarea

Return flow Sprinkler GravityDistribution ac-ft per ac-ft per

% 1000 ac 1000 acJAN 2.0% 14 30FEB 1.0% 7 15MAR 0.0% 0 0APR 0.0% 0 0MAY 6.0% 41 89JUN 15.0% 101 222JUL 18.0% 122 266AUG 20.0% 135 295SEP 16.0% 108 236OCT 11.0% 74 163NOV 7.0% 47 103DEC 4.0% 27 59

676 1477

RETURN FLOW

Annual Return Volume = Example calculation: Volume returned to the river per unit area in June if sprinkler was used =(Return Flow Percentage for June) * (Volume of water returned, sprinkler) = 15.0% * 676 ac-ft/1000 acres = 101 ac-ft/1000 acres Volume returned to the river per unit area in June if gravity was used =(Return Flow Percentage for June) * (Volume of water returned, gravity) = 15.0% * 1477 ac-ft/1000 acres = 222 ac-ft/1000 acres

C.7 Determine Depletions per unit area Since depletions are simply the addition of diversions and return flows, the values from the previous two sections are added to obtain the depletion volumes per unit area, as shown in Table C-16. Depletions in ac-ft/1000 acres were converted to cfs/1000 acres.

Page C-23

Table C-16. Depletions per Unit Area (cfs/1000 ac): Sprinkler/Gravity Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 2.0% 14 14 0.2 JAN 0.0% 0 2.0% 30 30 0.5FEB 0.0% 0 1.0% 7 7 0.1 FEB 0.0% 0 1.0% 15 15 0.3MAR 0.0% 0 0.0% 0 0 0.0 MAR 0.0% 0 0.0% 0 0 0.0APR 0.2% -5 0.0% 0 -5 -0.1 APR 0.2% -7 0.0% 0 -7 -0.1MAY 9.1% -219 6.0% 41 -179 -2.9 MAY 9.1% -298 6.0% 89 -209 -3.4JUN 22.7% -548 15.0% 101 -446 -7.5 JUN 22.7% -745 15.0% 222 -523 -8.8JUL 31.7% -765 18.0% 122 -644 -10.5 JUL 31.7% -1041 18.0% 266 -775 -12.6AUG 25.8% -623 20.0% 135 -488 -7.9 AUG 25.8% -847 20.0% 295 -551 -9.0SEP 10.3% -249 16.0% 108 -141 -2.4 SEP 10.3% -338 16.0% 236 -102 -1.7OCT 0.2% -6 11.0% 74 69 1.1 OCT 0.2% -8 11.0% 163 155 2.5NOV 0.0% 0 7.0% 47 47 0.8 NOV 0.0% 0 7.0% 103 103 1.7DEC 0.0% 0 4.0% 27 27 0.4 DEC 0.0% 0 4.0% 59 59 1.0

0Total = 100.0% -2414 100.0% 676 -1738 Total = 100.0% -3283 100.0% 1477 -1806

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Example calculation: Depletions per 1000 acres in June if sprinkler was used = -548 ac-ft + 102 ac-ft = -446 ac-ft = (-446 ac-ft) / (30 days) / (1.98347 ac-ft/cfs-day) = -7.5 cfs Depletions per 1000 acres in June if gravity was used = -745 ac-ft + 222 ac-ft = -523 ac-ft = (-523 ac-ft) / (30 days) / (1.98347 ac-ft/cfs-day) = -8.79 cfs The data tables within Sections C.5, C.6 and C.7 can be found in a combined table in Appendix D.6 for all the other subareas.

C.8 Determine Incremental Irrigation Acreage Now that the depletion per unit area has been found for all the subareas, the next step is to find out the total irrigated acreage within each subarea, and how much of that area is irrigated by the sprinkler vs. gravity methods. Step 1: Find the total irrigated acres per subarea The total irrigated acres per county was obtained as explained in Section C.2, and summed (according to percentage contribution of each county’s irrigated land to a subarea) to give the total irrigated acres per subarea. For example, in the Lower Clark Fork subarea this would be the sum of the ‘Total Acres’ column in Table C-5. Step 2: Find percentage of total irrigated acres irrigated by Sprinkler and Gravity methods Now that the total irrigated acres per subarea is known, the next step is to determine the proportion of land irrigated by surface water versus groundwater (river flow is assumed

Page C-24

to be surface water flow). Groundwater flows were not considered because it is assumed that the groundwater and surface water are not interconnected in most of the smaller basins within the Columbia, with the exception of Spokane basin, as noted in Section 3.2. Once the proportion of surface water irrigated land is found, a further breakdown of how much land is irrigated by sprinkler vs. gravity is calculated. Acreage of land irrigated by a recent improvement to a type of sprinkler irrigation (micro-irrigation) was also included as part of sprinkler irrigated land. All of the above mentioned data were derived from the USGS water-use data set (USGS, 2005b). Step 3: Find the incremental irrigated acreage Once the acreage values of land irrigated by sprinkler and gravity are found, they are added to a table of historic sprinkler and gravity acreages values. An example of the Lower Clark Fork subarea is shown in Table C-17 below. Table C-17. Surface Water Irrigated Acreage (Sprinkler/Gravity) within Lower Clark Fork Subarea

Year Sprinkler Gravity Total1925 0.0 15.3 15.31928 0.0 15.5 15.51950 0.0 20.0 20.01966 8.0 19.0 27.01978 21.1 8.8 29.91988 13.5 5.6 19.11999 11.3 4.3 15.62008 10.3 3.8 14.1

Irrigated acres (1000s of acres)

Since modified flows account for the current level of irrigation, the incremental or difference in irrigated acreage is of importance to the depletions calculations rather than the actual irrigated acreage. Table C-18 shows these differences in irrigated acres between this current study and the previous studies. For the years in between studies, the acreage differences were linearly interpolated.

Page C-25

Table C-18. Incremental Surface Water Irrigated Acreage (Sprinkler/Gravity) within Lower Clark Fork Subarea

Year Sprinkler Gravity Total1925 10.3 -11.5 -1.21928 10.3 -11.7 -1.41950 10.3 -16.2 -5.91966 2.3 -15.2 -12.91978 -10.8 -5.0 -15.81988 -3.2 -1.8 -5.01999 -1.0 -0.5 -1.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

The data tables within Section C.8 can be found in Appendix sections D.7 and D.8 for all the other subareas.

C.9 Determine Incremental Depletions in cfs Now that incremental irrigated acreage has been found for sprinkler and gravity separately, each of these values is multiplied with the corresponding sprinkler or gravity depletions per unit area already calculated in the previous step. The total depletions will be the depletions from the two different irrigation methods added together. Reference the overview section:

Di = da * (ΔI) where, Di = incremental depletion, cfs da = depletion per unit area, cfs/1000 acres ΔI = incremental irrigated acres, 1000 acres Example calculation: Lower Clark Fork subarea: Incremental depletion due to sprinkler irrigation: June 1988 = sprinkler depletion per unit area * sprinkler incremental area = (-7.5 cfs/1000 acres) * (-3.2 x 1000s of acres) = 24.37 cfs Incremental depletion due to gravity irrigation: June 1988 = gravity depletion per unit area * gravity incremental area = (-8.79 cfs/1000 acres) * (-1.8 x 1000s of acres) = 15.64 cfs

Page C-26

Total incremental depletion: June 1988 = Sprinkler depletion + Gravity depletion = 24.37 cfs + 15.64 cfs = 40 cfs Note that the depletion per unit area values are monthly while the incremental area values are yearly. By multiplying these two values, monthly depletions are calculated for every year of the study. Daily depletion values are created from the monthly values by assigning a monthly value as a constant for every day of that month. With the formation of the daily depletion data, there are now a set of D values for each subarea. In the above calculations, depletion per unit area is multiplied by incremental acreage. It is assumed that the incremental part of the depletion calculation is from the incremental acreage. There is not an incremental component to the depletions per unit area portion of the equation. It is assumed that the depletion per unit area is constant through the years, whereas in actuality, the depletion per unit area values for sprinkler and gravity may be different in the past compared to now due to different types and proportions of crops, and different climatic conditions.

C.10 Applying D to Modified Flow Points Now that the D values have been calculated for every subarea, the next step is to determine how and where in the system to apply these values. The D values of each subarea are applied so that a percentage of the incremental depletions for that subarea are applied above, below, or between two projects. These percentages were estimated using ESRI’s ArcMap program and a spatial irrigation data set from the University of Frankfurt. When a modified flow project point/points fall within a subarea, it is necessary to define what percentage of the incremental depletion for the subarea should be applied at the point/points. This accounts for the spatial distribution of irrigation depletions within the subarea. This section will describe the method used to calculate the percentages applied at the modified flow points. To represent the spatial distribution of irrigation the dataset from the University of Frankfurt was used (Section C.1.2.1 above) in this method:

1. Calculate the total irrigated land within the subareas using the Spatial Analyst tool in GIS.

2. Split the subareas according to the modified flow project points. To find this

area the USGS EDNA web-based tool [available on line at: http://edna.usgs.gov] was used to define boundaries above project points based on the basin topography. These boundaries break the subarea into regions that represent the land area which directly

Page C-27

contributes to the flow at that modified flow point. Again using the Spatial Analyst tool in ESRI ArcMap (2006) the sum of the total irrigated land within the “partial” subareas was calculated.

3. Data from step 2 is divided by the data in step 1 and multiplied by 100% to

derive the desired percentages to be used. Figure C-4 is included below for the Lower Clark Fork subarea to help visualize the process described in this section.

Figure C-4. Percentage Application of Incremental Depletions (LCF5D) in the Lower Clark Fork Subarea. Dark bold line represents Lower Clark Fork subarea. Light gray lines represent how the subarea was split up based on project points. Blue numbers are the percentage of irrigation located in that portion of the subarea

Page C-28

Page C-29

The incremental depletions at the Lower Clark Fork subarea are denoted as “LCF5D”. Based on the results shown in the above figure, 83.8% of the depletions apply above Thompson Falls Dam, 15.9% apply between Thompson Falls and Noxon Dams, and 0.3% apply between Noxon and Cabinet dams. After rounding, the incremental depletions applied just above Thompson Falls due to irrigation in the Lower Clark Fork subarea will be 0.84*LCF5D, and between Noxon and Thompson Falls, it will be 0.16*LCF5D. Irrigation Depletion Maps included in Appendix D.1 show all these percentages, as do the equations for calculating “DD” found throughout Section 3.

This page is intentionally left blank

Appendix D – Depletion Data The tables in this appendix contain data used in calculating incremental irrigation depletions (D) as per the method explained in Appendix C. Below is a list of the tables in this appendix and the corresponding example tables within Appendix C where detailed explanations regarding these data can be found.

In Appendix D Corresponding

sections in Appendix C Irrigated Crop Acreage by County Table C-3 Percent of County Irrigated Acreage within Subarea &

Percent Distribution of Crop Types Table C-4, Table C-5

Monthly Diversion Distribution Percentage & Total Water Required by Crops per 1000 Acres

Table C-13, Table C-9

Diversion & Return Flow Volumes (ac-ft/1000 ac) based on Sprinkler/Gravity Efficiencies

Table C-12

Depletions per Unit Area (cfs/1000 ac) – Sprinkler/Gravity

Table C-16

Surface Water Irrigated Acreage (Sprinkler/Gravity) Table C-17 Incremental Surface Water Irrigated Acreage

(Sprinkler/Gravity) Table C-18

Irrigation depletion data shown in this appendix were obtained or derived from the following data sources:

2007 United States Department of Agriculture (USDA) Census of Agriculture 2005 USGS Wateruse Data 2006 Canadian Census of Agriculture provided by Statistics Canada British Columbia Ministry of Agriculture and Lands

Page D-1

D.1 Application of Irrigation Adjustment

D.1.1 Upper Columbia and Kootenay Basins

Page D-2

D.1.2 Pend Oreille and Spokane Basins

Page D-3

D.1.3 Mid-Columbia Basin Columbia River: International boundary to mouth of the Snake River

Page D-4

D.1.4 Lower Snake Basin Lower Snake River: Brownlee to Ice Harbor

Page D-5

D.1.5 Lower Columbia Basin Columbia River: McNary to Bonneville

Page D-6

D.1.6 Willamette Basin

Page D-7

D.2 Irrigated Crop Acreage by County

D.2.1 Upper Columbia and Kootenay Basins Kootenai-Montana (KMT)

State Montana MontanaCounty Flathead Lincoln

USDA Table 10 Irrigated Pastureland 3,277 1,408Barley 2,743 0Corn for Grain 0 0Corn for Silage 0 0Dry Beans 0 0Alfalfa Hay 9,338 2,814Oats 253 0Sugar Beet 0 0Wheat 5,949 0Small Vegetables 297 0Orchards w Cover 53 17Sum of Table 25 18,633 2,831

Higher of USDA or USGS

Total Irrigated Cropland 20,002 2,849

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93% 99%

Acres

USDA Table 25

Kootenai-Idaho (KID)

AcresState IdahoCounty Boundary

USDA Table 10 Irrigated Pastureland 173Barley 0Corn for Grain 0Corn for Silage 0Dry Beans 0Alfalfa Hay 0Oats 0Sugar Beet 0Wheat 0Small Vegetables 10Orchards w Cover 26Sum of Table 25 36

Higher of USDA or USGS

Total Irrigated Cropland 2,592

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 1%

USDA Table 25

Page D-8

D.2.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

AcresState MontanaCounty Flathead

USDA Table 10 Irrigated Pastureland 3,277Barley 2,743Corn for Grain 0Corn for Silage 0Dry Beans 0Alfalfa Hay 9,338Oats 253Sugar Beet 0Wheat 5,949Small Vegetables 297Orchards w Cover 53Sum of Table 25 18,633

Higher of USDA or USGS

Total Irrigated Cropland 20,002

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93%

USDA Table 25

Flathead Irrigation District (FID)

State Montana Montana MontanaCounty Lake Missoula Sanders

USDA Table 10 Irrigated Pastureland 37,322 4,387 5,288Barley 1,550 0 0Corn for Grain 950 0 0Corn for Silage 1,125 0 0Dry Beans 0 0 0Alfalfa Hay 34,493 11,140 10,838Oats 456 0 0Sugar Beet 0 0 0Wheat 7,513 762 275Small Vegetables 2,403 50 31Orchards w Cover 839 11 19Sum of Table 25 49,329 11,963 11,163

Higher of USDA or USGS

Total Irrigated Cropland 49,204 12,168 11,576

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 100% 98% 96%

Acres

USDA Table 25

Page D-9

Bitterroot (BIT)

State Montana MontanaCounty Missoula Ravalli

USDA Table 10 Irrigated Pastureland 4,387 36,007Barley 0 1,09Corn for Grain 0 0Corn for Silage 0 4Dry Beans 0 0Alfalfa Hay 11,140 32,856Oats 0 4Sugar Beet 0 0Wheat 762 600Small Vegetables 50 69Orchards w Cove

3

68

55

r 11 208Sum of Table 25 11,963 35,749

Higher of USDA or USGS

Total Irrigated Cropland 12,168 36,228

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 98% 99%

USDA Table 25

Acres

Upper Clark Fork (UCF)

State Montana Montana Montana Montana Montana MontanaCounty Deer Lodge Granite Lewis & Clark Missoula Powell Silver Bow

USDA Table 10 Irrigated Pastureland 8,879 10,926 5,356 4,387 21,107 2,309Barley 0 217 6,760 0 971 0Corn for Grain 0 0 0 0 0Corn for Silage 0 0 0 0 0Dry Beans 0 0 0 0 0Alfalfa Hay 10,696 19,428 34,301 11,140 51,602 6,474Oats 0 0 0 0 196 0Sugar Beet 0 0 0 0 0Wheat 0 781 3,287 762 0 0Small Vegetables 0 0 13 50 0 0Orchards w Cove

000

0

r 0 0 0 11 0Sum of Table 25 10,696 20,426 44,361 11,963 52,769 6,474

Higher of USDA or USGS

Total Irrigated Cropland 8,879 20,354 44,901 12,168 52,996 6,488

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 99% 100% 99% 98% 100% 100%

Acres

USDA Table 25

0

Lower Clark Fork (LCF)

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders

USDA Table 10 Irrigated Pastureland 380 809 4,387 5,288Barley 0 0 0 0Corn for Grain 0 0 0 0Corn for Silage 0 0 0 0Dry Beans 0 0 0 0Alfalfa Hay 1,510 507 11,140 10,838Oats 28 0 0 0Sugar Beet 0 0 0 0Wheat 0 0 762 275Small Vegetables 4 0 50 31Orchards w Cover 13 0 11 1Sum of Table 25 1,555 507 11,963 11,163

Higher of USDA or USGS

Total Irrigated Cropland 1,678 533 12,168 11,576

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93% 95% 98% 96%

Acres

USDA Table 25

9

Page D-10

Pend Oreille Basin in USA (PEN)

State Idaho Idaho Wash. Wash.County Bonner Kootenai Pend Oreille Spokane

USDA Table 10 Irrigated Pastureland 380 1,048 486 1,744Barley 0 0 0 298Corn for Grain 0 0 0 0Corn for Silage 0 0 0 115Dry Beans 0 0 0 0Alfalfa Hay 1,510 4,611 575 5,964Oats 28 415 0 0Sugar Beet 0 0 0 0Wheat 0 1,610 0 1,576Small Vegetables 4 141 0 1,440Orchards w Cover 13 0 7 353Sum of Table 25 1,555 6,777 582 9,746

Higher of USDA or USGS

Total Irrigated Cropland 1,678 9,987 627 11,714

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93% 68% 93% 83%

Acres

USDA Table 25

Spokane (SPV)

State Idaho Idaho Wash. Wash. Wash. Wash. Wash.County Bonner Kootenai Lincoln Pend Oreille Spokane Stevens Whitman

USDA Table 10 Irrigated Pastureland 380 1,048 1,568 486 1,744 6,349 2,675Barley 0 0 740 0 298 179 0Corn for Grain 0 0 0 0 0 0 0Corn for Silage 0 0 0 0 115 0 0Dry Beans 0 0 0 0 0 0 0Alfalfa Hay 1,510 4,611 7,979 575 5,964 8,039 2,902Oats 28 415 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0Wheat 0 1,610 14,549 0 1,576 0 0Small Vegetables 4 141 2,489 0 1,440 47 3Orchards w Cover 13 0 16 7 353 154 46Sum of Table 25 1,555 6,777 25,773 582 9,746 8,419 2,951

Higher of USDA or USGS

Total Irrigated Cropland 1,678 9,987 30,503 627 11,714 8,601 4,191

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 93% 68% 84% 93% 83% 98% 70%

USDA Table 25

Acres

Page D-11

D.2.3 Mid-Columbia Basin Methow-Okanogan (OKM)

AcresState Wash.County Okanogan

USDA Table 10 Irrigated Pastureland 6,871Barley 0Corn for Grain 0Corn for Silage 795Dry Beans 3Alfalfa Hay 18,963Oats 0Sugar Beet 0Wheat 0Small Vegetables 88Orchards w Cover 24,460Sum of Table 25 44,309

Higher of USDA or USGS

Total Irrigated Cropland 44,711

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 99%

USDA Table 25

Ferry-Stevens (FER)

State Wash. Wash. Wash. Wash. Wash.County Ferry Lincoln Okanogan Pend Oreille Stevens

USDA Table 10 Irrigated Pastureland 398 1,568 6,871 486 6,349Barley 0 740 0 0 179Corn for Grain 0 0 0 0Corn for Silage 0 0 795 0Dry Beans 0 0 3 0Alfalfa Hay 2,859 7,979 18,963 575 8,039Oats 0 0 0 0Sugar Beet 0 0 0 0Wheat 0 14,549 0 0 0Small Vegetables 4 2,489 88 0 47Orchards w Cover 0 16 24,460 7 154Sum of Table 25 2,863 25,773 44,309 582 8,419

Higher of USDA or USGS

Total Irrigated Cropland 2,957 30,503 44,711 627 8,601

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 97% 84% 99% 93% 98%

Acres

USDA Table 25

000

00

Page D-12

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

State Wash. Wash. Wash. Wash. Wash. Wash.County Chelan Douglas Ferry Grant Kittitas Okanogan

USDA Table 10 Irrigated Pastureland 3,305 913 398 18,077 29,725 6,871Barley 12 0 0 173 0 0Corn for Grain 0 0 0 57,432 0 0Corn for Silage 0 0 0 8,334 0 795Dry Beans 0 0 0 13,117 0 3Alfalfa Hay 1,750 2,324 2,859 145,909 48,155 18,963Oats 0 0 0 0 293Sugar Beet 0 0 0 0 0 0Wheat 0 595 0 51,578 859 0Small Vegetables 20 8 4 95,896 1,563 88Orchards w Cover 22,681 14,877 0 58,170 867 24,460Sum of Table 25 24,463 17,804 2,863 430,609 51,737 44,309

Higher of USDA or USGS

Total Irrigated Cropland 24,925 18,496 2,957 451,713 52,422 44,711

Scaling Facto

0

r Sum of Table 25 / Total Irrigated Cropland = 98% 96% 97% 95% 99% 99%

USDA Table 25

Acres

Page D-13

D.2.4 Lower Snake Basin Upper Salmon (UPS)

State Idaho Idaho IdahoCounty Blaine Custer Lemhi

USDA Table 10 Irrigated Pastureland 12,214 24,457 42,488Barley 7,637 691 0Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 22,279 29,108 33,788Oats 0 0 147Sugar Beet 0 0 0Wheat 0 0 0Small Vegetables 1,377 0 0Orchards w Cover 0 0Sum of Table 25 31,293 29,799 33,963

Higher of USDA or USGS

Total Irrigated Cropland 31,751 31,506 34,468

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 99% 95% 99%

USDA Table 25

Acres

28

Lower Salmon (LWS)

State Idaho Idaho Idaho Idaho Idaho IdahoCounty Adams Custer Idaho Lemhi Lewis Valley

USDA Table 10 Irrigated Pastureland 18,263 24,457 860 42,488 305 19,265Barley 0 691 0 0 0 0Corn for Grain 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0Alfalfa Hay 6,503 29,108 0 33,788 0 2,711Oats 0 0 0 147 0 0Sugar Beet 0 0 0 0 0 0Wheat 0 0 0 0 0 0Small Vegetables 0 0 14 0 0Orchards w Cover 5 0 26 28 0 0Sum of Table 25 6,508 29,799 40 33,963 0 2,726

Higher of USDA or USGS

Total Irrigated Cropland 6,651 31,506 328 34,468 5 2,871

Scaling Facto

15

r Sum of Table 25 / Total Irrigated Cropland = 98% 95% 12% 99% 0% 95%

Acres

USDA Table 25

Grande Ronde at Wenaha (WEN)

State Idaho Idaho Oregon Oregon Wash. Wash.County Idaho Nez Perce Union Wallowa Asotin Garfield

USDA Table 10 Irrigated Pastureland 860 176 10,700 13,692 156 95Barley 0 0 843 1,668 0 0Corn for Grain 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0Alfalfa Hay 0 295 18,658 24,634 58 328Oats 0 0 0 352 0 0Sugar Beet 0 0 2,006 0 0 0Wheat 0 0 11,188 3,427 0 0Small Vegetables 14 8 1,110 42 24 0Orchards w Cover 26 43 286 0 56 0Sum of Table 25 40 346 34,091 30,123 138 328

Higher of USDA or USGS

Total Irrigated Cropland 328 384 52,566 31,038 151 379

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 12% 90% 65% 97% 91% 87%

Acres

USDA Table 25

Page D-14

Clearwater (CLR)

State Idaho Idaho Idaho IdahoCounty Idaho Latah Lewis Nez Perce

USDA Table 10 Irrigated Pastureland 860 256 305 176Barley 0 0 0 0Corn for Grain 0 0 0 0Corn for Silage 0 0 0 0Dry Beans 0 0 0 0Alfalfa Hay 0 0 0Oats 0 0 0 0Sugar Beet 0 0 0 0Wheat 0 0 0 0Small Vegetables 14 8 0 8Orchards w Cover 26 9 0Sum of Table 25 40 17 0 346

Higher of USDA or USGS

Total Irrigated Cropland 328 54 5 384

Scaling Facto

295

43

r Sum of Table 25 / Total Irrigated Cropland = 12% 31% 0% 90%

USDA Table 25

Acres

Palouse-Lower Snake (PLS)

State Idaho Idaho Wash. Wash. Wash. Wash. Wash. Wash. Wash. Wash. Wash.County Latah Nez Perce Adams Asotin Columbia Franklin Garfield Lincoln Spokane WallaWalla Whitman

USDA Table 10 Irrigated Pastureland 256 176 3,642 156 686 5,907 95 1,568 1,744 5,276 2,675Barley 0 0 1,000 0 0 0 0 740 298 362 0Corn for Grain 0 0 8,603 0 0 16,369 0 0 0 4,758 0Corn for Silage 0 0 4,034 0 0 6,126 0 0 115 0 0Dry Beans 0 0 5,634 0 0 822 0 0 0 663 0Alfalfa Hay 0 295 26,255 58 1,301 99,136 328 7,979 5,964 13,452 2,902Oats 0 0 0 0 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0 0 0 0Wheat 0 0 25,702 0 1,150 16,009 0 14,549 1,576 14,842 0Small Vegetables 8 8 33,909 24 7 51,352 0 2,489 1,440 18,402 3Orchards w Cover 9 43 4,754 56 0 15,977 0 16 353 12,517 46Sum of Table 25 17 346 109,891 138 2,458 205,791 328 25,773 9,746 64,996 2,951

Higher of USDA or USGS

Total Irrigated Cropland 54 384 120,873 151 3,486 211,331 379 30,503 11,714 87,162 4,191

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 31% 90% 91% 91% 71% 97% 87% 84% 83% 75% 70%

USDA Table 25

Acres

00

Page D-15

D.2.5 Lower Columbia Basin Walla Walla (WWA)

State Oregon Wash. Wash.County Umatilla Columbia WallaWalla

USDA Table 10 Irrigated Pastureland 16,468 686 5,276Barley 817 0 362Corn for Grain 9,196 0 4,758Corn for Silage 806 0 0Dry Beans 1,665 0 663Alfalfa Hay 36,890 1,301 13,452Oats 0 0 0Sugar Beet 0 0 0Wheat 21,788 1,150 14,842Small Vegetables 24,721 7 18,402Orchards w Cover 5,038 0 12,517Sum of Table 25 100,921 2,458 64,996

Higher of USDA or USGS

Total Irrigated Cropland 125,833 3,486 87,162

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 80% 71% 75%

USDA Table 25

Acres

Umatilla (UMP, UMR, JDP, UMW)

State Oregon Oregon OregonCounty Gilliam Morrow Umatilla

USDA Table 10 Irrigated Pastureland 1,582 11,645 16,468Barley 0 421 817Corn for Grain 0 6,652 9,196Corn for Silage 0 0 806Dry Beans 0 0 1,665Alfalfa Hay 2,331 25,385 36,890Oats 0 0 0Sugar Beet 0 0 0Wheat 540 8,044 21,788Small Vegetables 0 21,572 24,721Orchards w Cover 0 0 5,038Sum of Table 25 2,871 62,074 100,921

Higher of USDA or USGS

Total Irrigated Cropland 5,878 78,252 125,833

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 49% 79% 80%

Acres

USDA Table 25

Page D-16

Northside (NSM, NSR, NSJ, KLC)

State Oregon Oregon Oregon Wash. Wash. Wash. Wash.County Gilliam Morrow Umatilla Benton Klickitat WallaWalla Yakima

USDA Table 10 Irrigated Pastureland 1,582 11,645 16,468 11,277 5,776 5,276 28,716Barley 0 421 817 180 0 362 0Corn for Grain 0 6,652 9,196 12,672 0 4,758 16,755Corn for Silage 0 0 806 0 0 0 25,Dry Beans 0 0 1,665 0 0 663 537Alfalfa Hay 2,331 25,385 36,890 16,200 6,557 13,452 49,433Oats 0 0 0 0 0 0Sugar Beet 0 0 0 2,076 0 0Wheat 540 8,044 21,788 14,678 974 14,842 11,350Small Vegetables 0 21,572 24,721 72,116 0 18,402 9,777Orchards w Cove

047

00

r 0 0 5,038 39,616 6,390 12,517 95,351Sum of Table 25 2,871 62,074 100,921 157,538 13,921 64,996 208,250

Higher of USDA or USGS

Total Irrigated Cropland 5,878 78,252 125,833 170,308 15,573 87,162 238,850

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 49% 79% 80% 93% 89% 75% 87%

USDA Table 25

Acres

John Day (JDA)

State Oregon Oregon Oregon Oregon Oregon OregonCounty Gilliam Grant Morrow Sherman Wasco Wheeler

USDA Table 10 Irrigated Pastureland 1,582 13,339 11,645 1,440 7,178 7,317Barley 0 0 421 0 122 0Corn for Grain 0 0 6,652 0 0 0Corn for Silage 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0Alfalfa Hay 2,331 27,169 25,385 634 7,089 6,454Oats 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0Wheat 540 0 8,044 186 2,157 0Small Vegetables 0 0 21,572 0 4 0Orchards w Cover 0 0 0 315 10,839 0Sum of Table 25 2,871 27,169 62,074 1,135 20,211 6,454

Higher of USDA or USGS

Total Irrigated Cropland 5,878 27,412 78,252 1,370 20,555 6,766

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 49% 99% 79% 83% 98% 95%

Acres

USDA Table 25

Deschutes - White River Wapanita (WHT)

State Oregon OregonCounty Sherman Wasco

USDA Table 10 Irrigated Pastureland 1,440 7,178Barley 0 1Corn for Grain 0 0Corn for Silage 0 0Dry Beans 0 0Alfalfa Hay 634 7,089Oats 0 0Sugar Beet 0 0Wheat 186 2,157Small Vegetables 0 4Orchards w Cove

22

r 315 10,839Sum of Table 25 1,135 20,211

Higher of USDA or USGS

Total Irrigated Cropland 1,370 20,555

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 83% 98%

Acres

USDA Table 25

Page D-17

Hood River (HOD)

State Oregon Oregon OregonCounty Hood River Sherman Wasco

USDA Table 10 Irrigated Pastureland 1,365 1,440 7,178Barley 0 0 122Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 1,391 634 7,089Oats 0 0 0Sugar Beet 0 0 0Wheat 0 186 2,157Small Vegetables 44 0 4Orchards w Cover 13,236 315 10,839Sum of Table 25 14,671 1,135 20,211

Higher of USDA or USGS

Total Irrigated Cropland 15,044 1,370 20,555

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 98% 83% 98%

Acres

USDA Table 25

White Salmon (WHS)

State Wash. Wash.County Klickitat Skamania

USDA Table 10 Irrigated Pastureland 5,776 28Barley 0 0Corn for Grain 0 0Corn for Silage 0 0Dry Beans 0 0Alfalfa Hay 6,557 30Oats 0 0Sugar Beet 0 0Wheat 974 0Small Vegetables 0 0Orchards w Cover 6,390 212Sum of Table 25 13,921 242

Higher of USDA or USGS

Total Irrigated Cropland 15,573 249

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 89% 97%

USDA Table 25

Acres

Page D-18

D.2.6 Willamette Basin Willamette (WMT)

State Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon OregonCounty Benton Clackamas Columbia Douglas Lane Lincoln Linn Marion Multnomah Polk Washington Yamhill

USDA Table 10 Irrigated Pastureland 1,591 3,649 855 6,045 3,404 302 4,914 3,565 326 1,113 1,125 1,919Barley 0 0 0 0 0 0 0 0 0 0 148Corn for Grain 0 0 0 0 0 0 0 0 0 0 91Corn for Silage 238 152 0 0 890 0 1,370 3,512 0 2,269 1,511 1,099Dry Beans 0 0 0 0 0 0 0 0 0 0 0 0Alfalfa Hay 1,753 5,020 1,050 8,637 4,868 405 2,611 6,413 0 1,097 1,957 2,310Oats 0 0 0 0 0 0 0 190 0 0 294Sugar Beet 0 0 0 0 0 0 0 0 0 0 0 0Wheat 0 0 0 0 0 0 1,138 555 0 338 816Small Vegetables 5,596 2,719 8 0 1,650 16 5,418 22,237 2,145 1,503 3,398 3,250Orchards w Cove

00

0

52

r 354 514 13 822 1,217 1 1,035 2,266 26 1,352 1,058 3,019Sum of Table 25 7,941 8,405 1,071 9,459 8,625 422 11,572 35,173 2,171 6,559 9,273 9,730

Higher of USDA or USGS

Total Irrigated Cropland 21,683 24,163 1,680 10,377 19,000 538 27,308 92,817 6,703 15,538 25,107 24,864

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 37% 35% 64% 91% 45% 78% 42% 38% 32% 42% 37% 39%

USDA Table 25

Acres

Fern Ridge (FRN)

AcresState OregonCounty Lane

USDA Table 10 Irrigated Pastureland 3,404Barley 0Corn for Grain 0Corn for Silage 890Dry Beans 0Alfalfa Hay 4,868Oats 0Sugar Beet 0Wheat 0Small Vegetables 1,650Orchards w Cover 1,217Sum of Table 25 8,625

Higher of USDA or USGS

Total Irrigated Cropland 19,000

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 45%

USDA Table 25

Page D-19

D.3 Percent of County Irrigated Acreage within Subarea and Percent Distribution of Crop Types

D.3.1 Upper Columbia and Kootenay Basins Kootenai-Montana (KMT)

State Montana MontanaCounty Flathead Lincoln

County Contribution to subarea

0.1% 100.0%

State Montana MontanaCounty Flathead Lincoln Total Acres Percent

Barley 3 0 3 0.1%Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 10 2,832 2,842 66.4%Oats 0 0 0Sugar Beet 0 0 0Wheat 6 0 6 0.1%Small Vegetables 0 0 0Orchards w Cover 0 17 17 0.4%Pasture 3 1,408 1,411 33.0%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Kootenai-Idaho (KID)

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

State IdahoCounty Boundary

County Contribution to subarea

100.0%

Irrigated Acres per county within the subarea.

State IdahoCounty Boundary Total Acres Percent

Barley 0 0Corn for Grain 0 0Corn for Silage 0 0Dry Beans 0 0Alfalfa Hay 0 0Oats 0 0Sugar Beet 0 0Wheat 0 0Small Vegetables 720 720 26.0%Orchards w Cover 1,872 1,872 67.7%Pasture 173 173 6.3%

Page D-20

D.3.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

State MontanaCounty Flathead

County Contribution to subarea

99.9%

Irrigated Acres per county within the subarea.

State MontanaCounty Flathead Total Acres Percent

Barley 2,942 2,942 12.6%Corn for Grain 0 0Corn for Silage 0 0Dry Beans 0 0Alfalfa Hay 10,014 10,014 43.1%Oats 271 271 1.2%Sugar Beet 0 0Wheat 6,380 6,380 27.4%Small Vegetables 319 319 1.4%Orchards w Cover 57 57 0.2%Pasture 3,274 3,274 14.1% Flathead Irrigation District (FID)

State Montana Montana MontanaCounty Lake Missoula Sanders

County Contribution to subarea

100.0% 20.0% 70.2%

State Montana Montana MontanaCounty Lake Missoula Sanders Total Acres Percent

Barley 1,546 0 0 1,546 1.5%Corn for Grain 948 0 0 948 0.9%Corn for Silage 1,122 0 0 1,122 1.1%Dry Beans 0 0 0 0Alfalfa Hay 34,406 2,266 7,890 44,562 43.8%Oats 455 0 0 455 0.4%Sugar Beet 0 0 0 0Wheat 7,494 155 200 7,849 7.7%Small Vegetables 2,397 10 23 2,430 2.4%Orchards w Cover 837 2 14 853 0.8%Pasture 37,322 877 3,712 41,912 41.2%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-21

Bitterroot (BIT)

State Montana MontanaCounty Missoula Ravalli

County Contribution to subarea

16.6% 100.0%

State Montana MontanaCounty Missoula Ravalli Total Acres Percent

Barley 0 1,108 1108 1.5%Corn for Grain 0 0 0Corn for Silage 0 474 474 0.6%Dry Beans 0 0 0Alfalfa Hay 1,881 33,296 35,177 46.9%Oats 0 461 461 0.6%Sugar Beet 0 0 0Wheat 129 608 737 1.0%Small Vegetables 8 70 78 0.1%Orchards w Cover 2 211 213 0.3%Pasture 728 36,007 36,735 49.0%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Upper Clark Fork (UCF)

State Montana Montana Montana Montana Montana MontanaCounty Deer Lodge Granite Lewis & Clark Missoula Powell Silver Bow

County Contribution to subarea

77.7% 100.0% 1.2% 22.7% 100.0% 51.6%

State Montana Montana Montana Montana Montana MontanaCounty Deer Lodge Granite Lewis & Clark Missoula Powell Silver Bow Total Acres Percent

Barley 0 216 82 0 975 0 1,274 1.0%Corn for Grain 0 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0 0Alfalfa Hay 8,402 19,360 417 2,572 51,824 3,348 85,922 66.3%Oats 0 0 0 0 197 0 197 0.2%Sugar Beet 0 0 0 0 0 0 0Wheat 0 778 40 176 0 0 994 0.8%Small Vegetables 0 0 0 12 0 0 12 0.0%Orchards w Cover 0 0 0 3 0 0 3Pasture 6,899 10,926 64 996 21,107 1,191 41,184 31.8%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-22

Lower Clark Fork (LCF)

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders

County Contribution to subarea

4.4% 100.0% 40.7% 29.8%

State Idaho Montana Montana MontanaCounty Bonner Mineral Missoula Sanders Total Acres Percent

Barley 0 0 0 0 0Corn for Grain 0 0 0 0 0Corn for Silage 0 0 0 0 0Dry Beans 0 0 0 0 0Alfalfa Hay 72 533 4,612 3,349 8,566 64.9%Oats 1 0 0 0 1Sugar Beet 0 0 0 0 0Wheat 0 0 315 85 400 3.0%Small Vegetables 0 0 21 10 30 0.2%Orchards w Cover 1 0 5 6 11 0.1%Pasture 17 809 1,786 1,576 4,187 31.7%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Pend O'Reille Basin in USA (PEN)

State Idaho Idaho Wash. Wash.County Bonner Kootenai Pend Oreille Spokane

County Contribution to subarea

95.3% 2.8% 84.3% 0.1%

State Idaho Idaho Wash. Wash.County Bonner Kootenai Pend Oreille Spokane Total Acres Percent

Barley 0 0 0 0 0Corn for Grain 0 0 0 0 0Corn for Silage 0 0 0 0 0Dry Beans 0 0 0 0 0Alfalfa Hay 1,553 190 522 7 2,272 70.5%Oats 29 17 0 0 46 1.4%Sugar Beet 0 0 0 0 0Wheat 0 66 0 2 68 2.1%Small Vegetables 4 6 0 2 12 0.4%Orchards w Cover 13 0 6 0 20 0.6%Pasture 362 29 410 2 803 24.9%

Percentage of counties' irrigated land within subarea. Used

Irrigated Acres per county within the subarea.

Page D-23

Spokane (SPV)

State Idaho Idaho Idaho Idaho Wash. Wash. Wash. Wash. Wash.County Benewah Bonner Kootenai Shoshone Lincoln Pend Oreille Spokane Stevens Whitman

County Contribution to subarea

99.0% 0.3% 97.2% 100.0% 7.4% 15.1% 75.2% 13.6% 1.1%

State Idaho Idaho Idaho Idaho Wash. Wash. Wash. Wash. Wash.County Benewah Bonner Kootenai Shoshone Lincoln Pend Oreille Spokane Stevens Whitman Total Acres Percent

Barley 0 0 0 0 65 0 269 25 0 359 1.4%Corn for Grain 0 0 0 0 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0 104 0 0 104 0.4%Dry Beans 0 0 0 0 0 0 0 0 0 0Alfalfa Hay 0 5 6,605 0 699 94 5,391 1,117 45 13,955 54.7%Oats 0 0 594 0 0 0 0 0 0 595 2.3%Sugar Beet 0 0 0 0 0 0 0 0 0 0Wheat 0 0 2,306 0 1,274 0 1,424 0 0 5,005 19.6%Small Vegetables 0 0 202 0 218 0 1,302 7 0 1,728 6.8%Orchards w Cover 0 0 0 0 1 1 319 21 1 344 1.3%Pasture 0 1 1,019 0 116 73 1,311 863 29 3,414 13.4%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-24

D.3.3 Mid-Columbia Basin Methow-Okanogan (OKM)

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

State Wash.County Okanogan

County Contribution to subarea

78.6%

Irrigated Acres per county within the subarea.

State Wash.County Okanogan Total Acres Percent

Barley 0 0Corn for Grain 0 0Corn for Silage 630 630 1.6%Dry Beans 2 2Alfalfa Hay 15,035 15,035 37.1%Oats 0 0Sugar Beet 0 0Wheat 0 0Small Vegetables 70 70 0.2%Orchards w Cover 19,393 19,393 47.8%Pasture 5,399 5,399 13.3% Ferry-Stevens (FER)

State Wash. Wash. Wash. Wash. Wash.County Ferry Lincoln Okanogan Pend Oreille Stevens

County Contribution to subarea

99.4% 7.7% 3.8% 0.5% 86.4%

State Wash. Wash. Wash. Wash. Wash.County Ferry Lincoln Okanogan Pend Oreille Stevens Total Acres Percent

Barley 0 67 0 0 158 225 1.1%Corn for Grain 0 0 0 0 0 0Corn for Silage 0 0 31 0 0 31 0.1%Dry Beans 0 0 0 0 0 0Alfalfa Hay 2,935 727 735 3 7,096 11,496 55.5%Oats 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0Wheat 0 1,326 0 0 0 1,326 6.4%Small Vegetables 4 227 3 0 41 276 1.3%Orchards w Cover 0 1 948 0 136 1,086 5.2%Pasture 396 121 264 2 5,486 6,268 30.3%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-25

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

State Wash. Wash. Wash. Wash. Wash. Wash.County Chelan Douglas Ferry Grant Kittitas Okanogan

County Contribution to subarea

100.0% 77.5% 0.6% 9.7% 0.1% 18.6%

State Wash. Wash. Wash. Wash. Wash. Wash.County Chelan Douglas Ferry Grant Kittitas Okanogan Total Acres Percent

Barley 12 0 0 18 0 0 30Corn for Grain 0 0 0 5,844 0 0 5,844 5.9%Corn for Silage 0 0 0 848 0 149 997 1.0%Dry Beans 0 0 0 1,335 0 1 1,335 1.4%Alfalfa Hay 1,783 1,870 18 14,847 71 3,558 22,147 22.5%Oats 0 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0Wheat 0 479 0 5,248 1 0 5,728 5.8%Small Vegetables 20 6 0 9,758 2 17 9,803 9.9%Orchards w Cover 23,109 11,970 0 5,919 1 4,589 45,589 46.3%Pasture 3,305 707 2 1,753 43 1,278 7,089 7.2%

Irrigated Acres per county within the subarea.

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Page D-26

D.3.4 Lower Snake Basin Upper Salmon (UPS)

State Idaho Idaho IdahoCounty Blaine Custer Lemhi

County Contribution to subarea

0.7% 61.3% 99.0%

State Idaho Idaho IdahoCounty Blaine Custer Lemhi Total Acres Percent

Barley 54 448 0 502 0.5%Corn for Grain 0 0 0 0Corn for Silage 0 0 0 0Dry Beans 0 0 0 0Alfalfa Hay 158 18,865 33,947 52,971 47.8%Oats 0 0 148 148 0.1%Sugar Beet 0 0 0 0Wheat 0 0 0 0Small Vegetables 10 0 0 10Orchards w Cover 0 0 28 28Pasture 85 14,992 42,063 57,141 51.6%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Lower Salmon (LWS)

State Idaho Idaho Idaho Idaho Idaho IdahoCounty Adams Custer Idaho Lemhi Lewis Valley

County Contribution to subarea

44.0% 0.1% 29.8% 0.0% 2.1% 0.2%

State Idaho Idaho Idaho Idaho Idaho IdahoCounty Adams Custer Idaho Lemhi Lewis Valley Total Acres Percent

Barley 0 1 0 0 0 0 1Corn for Grain 0 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0 0Alfalfa Hay 2,924 31 0 15 0 6 2,976 26.0%Oats 0 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0Wheat 0 0 0 0 0 0 0Small Vegetables 0 0 34 0 0 0 34 0.3%Orchards w Cover 2 0 64 0 0 0 66 0.6%Pasture 8,036 24 256 19 6 39 8,380 73.1%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-27

Grande Ronde at Wenaha (WEN)

State Idaho Idaho Oregon Oregon Wash. Wash.County Idaho Nez Perce Union Wallowa Asotin Garfield

County Contribution to subarea

4.4% 7.3% 96.5% 100.0% 95.1% 2.2%

State Idaho Idaho Oregon Oregon Wash. Wash.County Idaho Nez Perce Union Wallowa Asotin Garfield Total Acres Percent

Barley 0 0 1,254 1,719 0 0 2,973 2.8%Corn for Grain 0 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0 0Alfalfa Hay 0 24 27,762 25,382 60 8 53,237 50.1%Oats 0 0 0 363 0 0 363 0.3%Sugar Beet 0 0 2,985 0 0 0 2,985 2.8%Wheat 0 0 16,647 3,531 0 0 20,178 19.0%Small Vegetables 5 1 1,652 43 25 0 1,726 1.6%Orchards w Cover 9 3 426 0 58 0 497 0.5%Pasture 38 13 10,326 13,692 148 2 24,219 22.8%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Clearwater (CLR)

State Idaho Idaho Idaho Idaho IdahoCounty Clearwater Idaho Latah Lewis Nez Perce

County Contribution to subarea

100.0% 65.8% 36.9% 97.9% 84.3%

State Idaho Idaho Idaho Idaho IdahoCounty Clearwater Idaho Latah Lewis Nez Perce Total Acres Percent

Barley 0 0 0 0 0 0Corn for Grain 0 0 0 0 0 0Corn for Silage 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0Alfalfa Hay 0 0 0 0 276 276 16.6%Oats 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0Wheat 0 0 0 0 0 0Small Vegetables 0 76 9 0 7 92 5.5%Orchards w Cover 0 140 11 0 40 191 11.5%Pasture 0 566 94 299 148 1,107 66.4%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-28

Palouse-Lower Snake (PLS)State Idaho Idaho Wash. Wash. Wash. Wash. Wash. Wash. Wash. Wash. Wash.County Latah Nez Perce Adams Asotin Columbia Franklin Garfield Lincoln Spokane WallaWalla Whitman

USDA Table 10 Irrigated Pastureland 256 176 3,642 156 686 5,907 95 1,568 1,744 5,276 2,675Barley 0 0 1,000 0 0 0 0 740 298 362 0Corn for Grain 0 0 8,603 0 0 16,369 0 0 0 4,758 0Corn for Silage 0 0 4,034 0 0 6,126 0 0 115 0 0Dry Beans 0 0 5,634 0 0 822 0 0 0 663 0Alfalfa Hay 0 295 26,255 58 1,301 99,136 328 7,979 5,964 13,452 2,902Oats 0 0 0 0 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0 0 0 0Wheat 0 0 25,702 0 1,150 16,009 0 14,549 1,576 14,842 0Small Vegetables 8 8 33,909 24 7 51,352 0 2,489 1,440 18,402 3Orchards w Cover 9 43 4,754 56 0 15,977 0 16 353 12,517 46Sum of Table 25 17 346 109,891 138 2,458 205,791 328 25,773 9,746 64,996 2,951

Higher of USDA or USGS

Total Irrigated Cropland 54 384 120,873 151 3,486 211,331 379 30,503 11,714 87,162 4,191

Scaling Factor Sum of Table 25 / Total Irrigated Cropland = 31% 90% 91% 91% 71% 97% 87% 84% 83% 75% 70%

USDA Table 25

Acres

00

Page D-29

D.3.5 Lower Columbia Basin Walla Walla (WWA)

State Oregon Wash. Wash.County Umatilla Columbia WallaWalla

County Contribution to subarea

21.4% 70.4% 76.3%

State Oregon Wash. Wash.County Umatilla Columbia WallaWalla Total Acres Percent

Barley 218 0 370 588 0.6%Corn for Grain 2,454 0 4,866 7,320 7.0%Corn for Silage 215 0 0 215 0.2%Dry Beans 444 0 678 1,122 1.1%Alfalfa Hay 9,843 1,299 13,757 24,899 24.0%Oats 0 0 0 0Sugar Beet 0 0 0 0Wheat 5,814 1,148 15,179 22,140 21.3%Small Vegetables 6,596 7 18,819 25,422 24.5%Orchards w Cover 1,344 0 12,801 14,145 13.6%Pasture 3,524 483 4,023 8,031 7.7%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Umatilla (UMP, UMR, JDP, UMW)

State Oregon Oregon OregonCounty Gilliam Morrow Umatilla

County Contribution to subarea

13.3% 61.1% 73.6%

State Oregon Oregon OregonCounty Gilliam Morrow Umatilla Total Acres Percent

Barley 0 324 750 1,074 0.7%Corn for Grain 0 5,124 8,439 13,563 8.4%Corn for Silage 0 0 740 740 0.5%Dry Beans 0 0 1,528 1,528 1.0%Alfalfa Hay 635 19,553 33,853 54,040 33.6%Oats 0 0 0 0Sugar Beet 0 0 0 0Wheat 147 6,196 19,994 26,337 16.4%Small Vegetables 0 16,616 22,686 39,302 24.5%Orchards w Cover 0 0 4,623 4,623 2.9%Pasture 210 7,115 12,120 19,446 12.1%

Percentage of counties' irrigated land within subarea.

Irrigated Acres per county within the subarea.

Page D-30

Northside (NSM, NSR, NSJ, KLC)

State Oregon Oregon Oregon Wash. Wash. Wash. Wash.County Gilliam Morrow Umatilla Benton Klickitat WallaWalla Yakima

County Contribution to subarea

27.6% 36.3% 5.0% 63.5% 93.7% 3.8% 3.4%

State Oregon Oregon Oregon Wash. Wash. Wash. Wash.County Gilliam Morrow Umatilla Benton Klickitat WallaWalla Yakima Total Acres Percent

Barley 0 193 51 124 0 18 0 385 0.2%Corn for Grain 0 3,044 573 8,703 0 240 644 13,204 7.0%Corn for Silage 0 0 50 0 0 0 962 1,013 0.5%Dry Beans 0 0 104 0 0 33 21 158 0.1%Alfalfa Hay 1,317 11,616 2,300 11,126 6,875 678 1,899 35,812 18.9%Oats 0 0 0 0 0 0 0 0Sugar Beet 0 0 0 1,426 0 0 0 1,426 0.8%Wheat 305 3,681 1,358 10,081 1,021 748 436 17,631 9.3%Small Vegetables 0 9,871 1,541 49,529 0 928 376 62,245 32.8%Orchards w Cover 0 0 314 27,208 6,700 631 3,664 38,517 20.3%Pasture 437 4,227 823 7,164 5,414 198 962 19,226 10.1%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

John Day (JDA)

State Oregon Oregon Oregon Oregon Oregon OregonCounty Gilliam Grant Morrow Sherman Wasco Wheeler

County Contribution to subarea

59.1% 64.7% 2.6% 50.2% 0.0% 97.2%

State Oregon Oregon Oregon Oregon Oregon OregonCounty Gilliam Grant Morrow Sherman Wasco Wheeler Total Acres Percent

Barley 0 0 14 0 0 0 14 0.0%Corn for Grain 0 0 218 0 0 0 218 0.5%Corn for Silage 0 0 0 0 0 0 0Dry Beans 0 0 0 0 0 0 0Alfalfa Hay 2,821 17,736 832 384 3 6,577 28,352 58.8%Oats 0 0 0 0 0 0 0Sugar Beet 0 0 0 0 0 0 0Wheat 653 0 264 113 1 0 1,031 2.1%Small Vegetables 0 0 707 0 0 0 707 1.5%Orchards w Cover 0 0 0 191 4 0 195 0.4%Pasture 935 8,630 303 723 3 7,112 17,706 36.7%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-31

Deschutes - White River Wapanita (WHT)

State Oregon OregonCounty Sherman Wasco

County Contribution to subarea

33.4% 31.6%

State Oregon OregonCounty Sherman Wasco Total Acres Percent

Barley 0 39 39 0.4%Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 256 2,280 2,536 26.1%Oats 0 0 0Sugar Beet 0 0 0Wheat 75 694 769 7.9%Small Vegetables 0 1 1Orchards w Cover 127 3,487 3,614 37.2%Pasture 481 2,270 2,751 28.3%

Percentage of counties' irrigated land within subarea.

Irrigated Acres per county within the subarea.

Hood River (HOD)

State Oregon Oregon OregonCounty Hood River Sherman Wasco

County Contribution to subarea

100.0% 16.4% 68.3%

State Oregon Oregon OregonCounty Hood River Sherman Wasco Total Acres Percent

Barley 0 0 85 85 0.2%Corn for Grain 0 0 0 0Corn for Silage 0 0 0 0Dry Beans 0 0 0 0Alfalfa Hay 1,426 125 4,926 6,477 18.1%Oats 0 0 0 0Sugar Beet 0 0 0 0Wheat 0 37 1,499 1,536 4.3%Small Vegetables 45 0 3 48 0.1%Orchards w Cover 13,573 62 7,531 21,166 59.1%Pasture 1,365 236 4,904 6,505 18.2%

Percentage of counties' irrigated land within subarea.

Irrigated Acres per county within the subarea.

Page D-32

White Salmon (WHS)

State Wash. Wash.County Klickitat Skamania

County Contribution to subarea

6.3% 34.8%

State Wash. Wash.County Klickitat Skamania Total Acres Percent

Barley 0 0 0Corn for Grain 0 0 0Corn for Silage 0 0 0Dry Beans 0 0 0Alfalfa Hay 460 11 471 32.8%Oats 0 0 0Sugar Beet 0 0 0Wheat 68 0 68 4.8%Small Vegetables 0 0 0Orchards w Cover 448 76 524 36.5%Pasture 362 10 372 25.9%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Page D-33

D.3.6 Willamette Basin Willamette (WMT)

State Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon OregonCounty Benton Clackamas Columbia Douglas Lane Lincoln Linn Marion Multnomah Polk Washington Yamhill

County Contribution to subarea

100.0% 93.8% 33.3% 0.1% 96.0% 5.6% 100.0% 100.0% 58.9% 100.0% 100.0% 100.0%

State Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon Oregon OregonCounty Benton Clackamas Columbia Douglas Lane Lincoln Linn Marion Multnomah Polk Washington Yamhill Total Acres Percent

Barley 0 0 0 0 0 0 0 0 0 0 401 0 401 0.1%Corn for Grain 0 0 0 0 0 0 0 0 0 0 246 0 246 0.1%Corn for Silage 650 410 0 0 1,881 0 3,233 9,268 0 5,375 4,091 2,808 27,716 10.1%Dry Beans 0 0 0 0 0 0 0 0 0 0 0 0 0Alfalfa Hay 4,787 13,531 548 9 10,290 29 6,162 16,923 0 2,599 5,299 5,903 66,078 24.1%Oats 0 0 0 0 0 0 0 501 0 0 796 0 1,297 0.5%Sugar Beet 0 0 0 0 0 0 0 0 0 0 0 0 0Wheat 0 0 0 0 0 0 2,685 1,465 0 801 2,209 133 7,293 2.7%Small Vegetables 15,280 7,329 4 0 3,488 1 12,786 58,681 3,899 3,561 9,200 8,305 122,534 44.7%Orchards w Cover 967 1,385 7 1 2,573 0 2,442 5,980 47 3,203 2,865 7,715 27,184 9.9%Pasture 1,591 3,421 284 5 3,266 17 4,914 3,565 192 1,113 1,125 1,919 21,413 7.8%

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

Irrigated Acres per county within the subarea.

Fern Ridge (FRN)

Percentage of counties' irrigated land within subarea. Used to arrive at acreage in next table below.

State OregonCounty Lane

County Contribution to subarea

27.4%

Irrigated Acres per county within the subarea.

State OregonCounty Lane Total Acres Percent

Barley 0 0Corn for Grain 0 0Corn for Silage 537 537 8.8%Dry Beans 0 0Alfalfa Hay 2,938 2,938 47.9%Oats 0 0Sugar Beet 0 0Wheat 0 0Small Vegetables 996 996 16.2%Orchards w Cover 735 735 12.0%Pasture 933 933 15.2%

Page D-34

D.4 Monthly Diversion Distribution Percentage and Total Water Required by Crops per 1000 Acres

D.4.1 Upper Columbia and Kootenay Basins Upper Columbia above Mica (UPC)

Diversion Distribution

Cropland % 12.0% 88.0% 100.0%

JANFEBMARAPR 0.11 80.0% 0.7% 8MAY 2.31 16.1% 14.2% 169JUN 1.79 15.3% 3.24 22.6% 21.7% 256JUL 4.42 37.7% 4.11 28.7% 29.8% 346AUG 4.25 36.2% 3.50 24.4% 25.8% 299SEP 1.27 10.8% 1.06 7.4% 7.8% 90OCTNOVDECTotal 11.73 14.33 100% 1168

Inches% spread over the

yearInches

Grains HayTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement

% spread over the

year%

Hugh Keenleyside (ARD)

Diversion Distribution

Cropland % 1.0% 16.0% 83.0% 100.0%

JANFEBMARAPR 0.2 1.7% 0.44 3.0% 2.5% 31MAY 1.74 14.8% 2.72 16.3% 2.21 14.9% 15.1% 191JUN 4.76 40.6% 4.14 24.8% 3.17 21.4% 22.1% 278JUL 4.78 40.8% 5.05 30.2% 4.01 27.1% 27.7% 349AUG 0.25 2.1% 4.11 24.6% 3.39 22.9% 22.9% 289SEP 0.7 4.2% 1.33 9.0% 8.1% 101OCT 0.27 1.8% 1.5% 19NOVDECTotal 11.73 16.72 14.82 100% 1258

%Inches% spread over the

yearInches

Grains Hay PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year

Page D-35

East Kootenay (EKO) Diversion Distribution

Cropland % 6.0% 94.0% 100.0%

JANFEBMARAPR 0.33 1.9% 1.7% 26MAY 0.03 0.2% 2.39 13.5% 12.7% 187JUN 2.09 14.4% 3.45 19.4% 19.1% 281JUL 5.25 36.2% 4.92 27.7% 28.2% 412AUG 5.12 35.3% 4.32 24.3% 25.0% 364SEP 2.02 13.9% 2.2 12.4% 12.5% 182OCT 0.15 0.8% 0.8% 12NOVDECTotal 14.51 17.76 100% 1464

Inches% spread over the

yearInches

Grains HayTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement

% spread over the

year%

West Kootenay (WKO)

Diversion Distribution

Cropland % 34.0% 46.0% 2.0% 18.0% 100.0%

JANFEBMARAPRMAY 1.26 9.9% 2.20 12.7% 1.53 10.6% 2.52 12.5% 11.7% 0JUN 4.18 32.9% 3.52 20.3% 4.54 31.5% 4.54 22.4% 25.2% 0JUL 5.47 43.1% 4.94 28.6% 6.10 42.3% 6.10 30.1% 34.1% 0AUG 1.78 14.0% 4.51 26.1% 2.24 15.5% 5.39 26.6% 21.9% 0SEP 2.13 12.3% 1.69 8.3% 7.2% 0OCTNOVDECTotal 12.69 17.30 14.41 20.24 100% 0

Inches

Grains Hay Vegetables OrchardTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%

Kootenai-Montana (KMT)

Diversion Distribution

Cropland % 0.2% 66.4% 0.4% 33.0% 100.0%

JANFEBMARAPR 0.26 1.4% 0.5% 7MAY 2.25 18.0% 2.96 13.6% 2.97 13.7% 2.58 13.7% 13.7% 236JUN 5.45 43.7% 4.76 21.9% 4.76 21.9% 3.74 19.9% 21.3% 369JUL 4.77 38.3% 6.35 29.2% 6.35 29.2% 5.17 27.5% 28.7% 496AUG 5.56 25.6% 5.56 25.6% 4.67 24.9% 25.3% 438SEP 2.08 9.6% 2.08 9.6% 2.36 12.6% 10.5% 181OCTNOVDECTotal 12.47 21.71 21.72 18.78 100% 1727

Inches% spread over the

year%Inches

% spread over the

year

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

year

Alfalfa Hay Orchards w Cover PastureCombined Grains

Page D-36

Kootenai-Idaho (KID)

Diversion Distribution

Cropland % 26.0% 67.7% 6.3% 100.0%

JANFEBMARAPR 0.27 1.4% 0.1% 1MAY 3.32 14.7% 2.63 13.8% 10.8% 201JUN 2.25 20.1% 4.95 21.9% 3.93 20.6% 21.3% 349JUL 4.60 41.2% 6.46 28.5% 5.3 27.7% 31.8% 492AUG 3.87 34.6% 5.52 24.4% 4.65 24.3% 27.1% 420SEP 0.45 4.0% 2.38 10.5% 2.33 12.2% 8.9% 156OCTNOVDECTotal 11.17 22.63 19.11 100% 1619

Inches% spread over the

Inches Inches% spread over the

%

Small Vegetables Orchards w Cover Pasture Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

Brilliant (BRI)

Diversion Distribution

Cropland % 89.0% 8.0% 3.0% 100.0%

JANFEBMARAPRMAY 2.20 13.0% 1.53 11.0% 2.52 12.0% 12.5% 180JUN 3.52 20.0% 4.54 32.0% 4.54 22.0% 21.3% 303JUL 4.94 29.0% 6.10 42.0% 6.1 30.0% 29.7% 422AUG 4.51 26.0% 2.24 16.0% 5.39 27.0% 25.2% 363SEP 2.13 12.0% 1.69 8.0% 11.2% 162OCTNOVDECTotal 17.30 14.41 20.24 100% 1430

OrchardTotal Water Required by Crops (ac-

ft/1000 acres)

%% spread over the

yearInches

% spread over the

yearInches

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

Hay Vegetables

Columbia at Trail (CTR)

Diversion Distribution

Cropland % 10.0% 84.0% 4.0% 2.0% 100.0%

JANFEBMARAPRMAY 1.26 9.9% 2.20 12.7% 1.53 10.6% 2.52 12.5% 12.3% 174JUN 4.18 32.9% 3.52 20.3% 4.54 31.5% 4.54 22.4% 22.1% 304JUL 5.47 43.1% 4.94 28.6% 6.1 42.3% 6.1 30.1% 30.6% 422AUG 1.78 14.0% 4.51 26.1% 2.24 15.5% 5.39 26.6% 24.5% 347SEP 2.13 12.3% 1.69 8.3% 10.5% 152OCTNOVDECTotal 12.69 17.30 14.41 20.24 100% 1399

Water Requirement

% spread over the

year%

% spread over the

yearInchesInches

% spread over the

yearInches

% spread over the

yearInches

Grains Hay Vegetables OrchardTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

Page D-37

D.4.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

Diversion Distribution

Cropland % 41.2% 43.1% 1.4% 0.2% 14.1% 100.0%

JANFEBMARAPR 0.06 0.4% 0.1% 1MAY 2.00 16.7% 1.16 6.6% 1.17 6.6% 2.10 13.0% 8.6% 105JUN 5.25 43.8% 4.08 23.2% 0.88 10.8% 4.08 23.2% 3.17 19.6% 28.5% 337JUL 4.73 39.5% 5.81 33.0% 4.01 49.1% 5.81 33.0% 4.73 29.2% 38.9% 463AUG 5.06 28.8% 3.27 40.1% 5.06 28.7% 4.25 26.3% 18.7% 256SEP 1.49 8.5% 1.49 8.5% 1.88 11.6% 5.3% 76OCTNOVDECTotal 11.98 17.6 8.16 17.61 16.19 100% 1238

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water RequirementPasture

Water Requirement Water Requirement Water Requirement

% spread over the

Inches %Inches% spread over the

Inches% spread over the

% spread over the

Combined Grains Alfalfa Hay Small Vegetables

Inches% spread over the

Inches

Orchards w Cover

Flathead Irrigation District (FID)

Diversion Distribution

Cropland % 9.7% 0.9% 1.1% 43.8% 2.4% 0.8% 41.2% 100.0%

JANFEBMARAPR 0.25 1.3% 0.5% 9MAY 2.00 16.7% 2.56 11.4% 2.57 11.4% 2.3 12.0% 11.7% 190JUN 5.25 43.8% 1.93 12.5% 1.71 11.5% 4.57 20.4% 1.55 13.9% 4.57 20.4% 3.58 18.7% 21.6% 342JUL 4.73 39.5% 5.57 36.2% 4.98 33.4% 6.51 29.0% 4.47 40.0% 6.51 29.0% 5.32 27.8% 29.9% 481AUG 5.80 37.7% 5.87 39.3% 5.82 25.9% 4.26 38.1% 5.82 25.9% 4.91 25.7% 23.9% 404SEP 2.08 13.5% 2.37 15.9% 2.9 12.9% 0.89 8.0% 2.9 12.9% 2.48 13.0% 11.6% 199OCT 0.08 0.4% 0.08 0.4% 0.28 1.5% 0.8% 13NOVDECTotal 11.98 15.38 14.93 22.44 11.17 22.45 19.12 100% 1637

Inches %

Corn for Grain Corn for SilageWater Requirement Water Requirement

Inches Inches% spread over the

yearInches

% spread over the

year

Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables

Inches% spread over the

yearInches

% spread over the

year

% spread over the

year

% spread over the

year

Bitterroot (BIT)

Diversion Distribution

Cropland % 3.1% 0.6% 46.9% 0.1% 0.3% 49.0% 100.0%

JANFEBMARAPR 0.26 1.3% 0.7% 11MAY 2.14 16.8% 1.85 8.8% 1.86 8.9% 2.48 12.8% 10.9% 179JUN 5.54 43.4% 2.01 14.1% 4.86 23.2% 1.88 17.7% 4.86 23.2% 3.86 19.8% 22.1% 364JUL 5.08 39.8% 5.45 38.2% 6.66 31.8% 4.70 44.2% 6.66 31.8% 5.46 28.1% 30.3% 501AUG 5.57 39.0% 5.55 26.5% 3.81 35.8% 5.55 26.5% 4.67 24.0% 24.6% 412SEP 1.24 8.7% 2.03 9.7% 0.25 2.3% 2.03 9.7% 2.46 12.6% 10.8% 181OCT 0.26 1.3% 0.7% 11NOVDECTotal 12.76 14.27 20.95 10.64 20.96 19.45 100% 1659

Corn for SilageWater Requirement

Inches% spread over the

year%Inches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover

Page D-38

Upper Clark Fork (UCF) Diversion Distribution

Cropland % 1.9% 66.3% 31.8% 100.0%

JANFEBMARAPRMAY 0.28 2.0% 0.59 4.4% 2.7% 31JUN 3.36 29.4% 4.08 29.1% 3.22 24.0% 27.5% 316JUL 6.00 52.5% 5.23 37.3% 4.25 31.7% 35.8% 411AUG 2.07 18.1% 4.44 31.6% 3.74 27.9% 30.2% 348SEP 1.61 12.0% 3.8% 43OCTNOVDECTotal 11.43 14.03 13.41 100% 1149

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

%% spread over the

yearInches

% spread over the

yearInches

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

Combined Grains Alfalfa Hay

Lower Clark Fork (LCF)

Diversion Distribution

Cropland % 3.0% 64.9% 0.2% 0.1% 31.7% 100.0%

JANFEBMARAPR 0.12 0.6% 0.2% 3MAY 1.67 13.1% 1.53 7.5% 1.54 7.5% 2.27 12.0% 9.1% 147JUN 5.35 41.9% 4.74 23.2% 1.54 14.9% 4.74 23.1% 3.76 19.9% 22.7% 370JUL 5.62 44.0% 6.64 32.4% 4.64 44.7% 6.64 32.4% 5.45 28.9% 31.7% 519AUG 0.14 1.1% 5.59 27.3% 3.89 37.5% 5.59 27.3% 4.71 25.0% 25.8% 428SEP 1.97 9.6% 0.3 2.9% 1.97 9.6% 2.4 12.7% 10.3% 170OCT 0.14 0.7% 0.2% 4NOVDECTotal 12.78 20.47 10.37 20.48 18.85 100% 1642

% spread over the

yearInches

% spread over the

yearInches %

Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

Pend Oreille Basin in USA (PEN)

Diversion Distribution

Cropland % 3.6% 70.5% 0.4% 0.6% 24.9% 100.0%

JANFEBMARAPRMAY 0.96 8.6% 1.07 6.1% 1.09 6.2% 1.87 11.9% 7.6% 105JUN 4.55 40.7% 4.13 23.6% 1.08 12.9% 4.13 23.6% 3.21 20.3% 23.4% 325JUL 5.34 47.8% 5.74 32.8% 3.99 47.8% 5.74 32.8% 4.68 29.7% 32.6% 455AUG 0.32 2.9% 4.93 28.2% 3.25 38.9% 4.93 28.1% 4.13 26.2% 26.8% 380SEP 1.63 9.3% 0.03 0.4% 1.63 9.3% 1.89 12.0% 9.6% 136OCTNOVDECTotal 11.17 17.5 8.35 17.52 15.78 100% 1401

Inches% spread over the

year%Inches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover Pasture

Page D-39

Pend Oreille Basin in Canada (POC) Diversion Distribution

Cropland % 2.0% 26.0% 72.0% 100.0%

JANFEBMARAPRMAY 2.92 13.4% 2.93 13.5% 2.25 12.9% 13.1% 203JUN 4.55 20.9% 4.55 21.0% 3.54 20.3% 20.5% 319JUL 6.11 28.0% 6.11 28.2% 4.95 28.4% 28.3% 440AUG 5.40 24.7% 5.40 24.9% 4.52 25.9% 25.7% 397SEP 2.62 12.0% 2.62 12.1% 2.16 12.4% 12.3% 191OCT 0.22 1.0% 0.07 0.3% 0.1% 2NOVDECTotal 21.82 21.68 17.42 100% 1551

%Inches% spread over the

yearInches

Hay Orchard PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year

Spokane (SPV)

Diversion Distribution

Cropland % 23.4% 0.4% 54.7% 6.8% 1.3% 13.4% 100.0%

JANFEBMARAPR 0.28 1.3% 0.2% 3MAY 2.44 18.3% 0.06 0.4% 3.05 12.0% 3.07 12.1% 2.62 12.2% 12.6% 219JUN 5.98 44.8% 2.39 16.7% 5.25 20.7% 2.29 19.1% 5.25 20.7% 4.21 19.6% 26.0% 422JUL 4.92 36.9% 5.56 38.8% 7.15 28.1% 5.01 41.9% 7.15 28.1% 5.89 27.4% 31.1% 526AUG 6.32 44.1% 6.28 24.7% 4.67 39.0% 6.28 24.7% 5.33 24.8% 20.0% 381SEP 3.36 13.2% 3.36 13.2% 2.9 13.5% 9.2% 189OCT 0.31 1.2% 0.31 1.2% 0.3 1.4% 0.9% 18NOVDECTotal 13.34 14.33 25.4 11.97 25.42 21.53 100% 1759

% spread over the

Inches% spread over the

%% spread over the

Inches% spread over the

Inches

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

Inches

Combined Grains Corn for Silage Alfalfa Hay Small Vegetables Orchards w Cover Pasture

% spread over the

Inches

Page D-40

D.4.3 Mid-Columbia Basin Okanagan (OKA)

Diversion Distribution

Cropland % 11.0% 43.0% 2.0% 43.0% 100.0%

JANFEBMARAPRMAY 0.14 0.9% 2.53 14.1% 1.3 6.8% 2.79 13.9% 12.3% 194JUN 2.27 15.4% 3.59 20.0% 4.52 23.6% 4.52 22.6% 20.5% 319JUL 5.10 34.5% 4.78 26.6% 5.85 30.6% 5.85 29.2% 28.4% 437AUG 5.03 34.0% 4.24 23.6% 5.04 26.3% 5.04 25.2% 25.2% 387SEP 2.24 15.2% 2.4 13.3% 2.43 12.7% 1.81 9.0% 11.6% 175OCT 0.44 2.4% 1.1% 16NOVDECTotal 14.78 17.98 19.14 20.01 100% 1529

%Inches% spread over the

year

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Grains Hay Vegetables Orchard

Inches

Methow-Okanogan (OKM)

Diversion Distribution

Cropland % 1.6% 37.1% 0.2% 47.8% 13.3% 100.0%

JANFEBMARAPR 0.25 1.2% 0.2% 3MAY 0.07 0.4% 3.07 12.6% 3.09 12.7% 2.62 12.8% 12.4% 247JUN 2.06 12.3% 4.89 20.0% 1.95 15.0% 4.89 20.0% 3.88 18.9% 19.8% 392JUL 4.89 29.1% 6.71 27.5% 4.58 35.3% 6.71 27.5% 5.51 26.9% 27.4% 543AUG 5.92 35.2% 5.94 24.3% 4.49 34.6% 5.94 24.3% 5.02 24.5% 24.5% 485SEP 3.54 21.1% 3.33 13.6% 1.97 15.2% 3.33 13.6% 2.88 14.1% 13.8% 273OCT 0.33 2.0% 0.47 1.9% 0.46 1.9% 0.33 1.6% 1.9% 37NOVDECTotal 16.81 24.41 12.99 24.42 20.49 100% 1980

%Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year

Corn for Silage Alfalfa Hay Small Vegetables Orchards w Cover

Kettle (KET)

Diversion Distribution

Cropland % 16.0% 82.0% 1.0% 1.0% 100.0%

JANFEBMARAPRMAY 2.05 19.1% 2.92 13.4% 2.93 13.5% 14.2% 229JUN 5.25 49.0% 4.55 20.9% 2.34 35.1% 4.55 21.0% 25.5% 387JUL 3.41 31.8% 6.11 28.0% 3.95 59.2% 6.11 28.2% 28.9% 471AUG 5.40 24.7% 0.38 5.7% 5.4 24.9% 20.6% 374SEP 2.62 12.0% 2.62 12.1% 10.0% 181OCT 0.22 1.0% 0.07 0.3% 0.8% 15NOVDECTotal 10.71 21.82 6.67 21.68 100% 1657

Grains Hay Vegetables OrchardTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInchesInches

% spread over the

yearInches

% spread over the

year

% spread over the

year%

Water Requirement

Page D-41

Ferry-Stevens (FER)

Diversion Distribution

Cropland % 7.5% 0.1% 55.5% 1.3% 5.2% 30.3% 100.0%

JANFEBMARAPR 0.21 1.1% 0.3% 5MAY 2.28 19.7% 2.97 13.5% 2.99 13.6% 2.41 12.7% 13.5% 225JUN 5.52 47.6% 2.27 15.5% 4.83 22.0% 2.18 20.2% 4.83 22.0% 3.82 20.1% 23.3% 378JUL 3.80 32.8% 5.48 37.5% 6.4 29.1% 4.56 42.3% 6.4 29.1% 5.24 27.5% 29.1% 486AUG 5.63 38.5% 5.61 25.5% 3.8 35.2% 5.61 25.5% 4.73 24.8% 23.6% 408SEP 1.25 8.5% 2.16 9.8% 0.25 2.3% 2.16 9.8% 2.5 13.1% 10.0% 173OCT 0.0% 0.0% 0.13 0.7% 0.2% 3NOV 0.0% 0.0% 0.0% 0.0% 0DEC 0.0% 0.0% 0.0% 0.0% 0Total 11.6 14.63 21.97 10.79 21.99 19.04 100% 1679

%

Corn for SilageWater Requirement

Inches Inches% spread over the

yearInches

% spread over the

year

Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables

Inches% spread over the

yearInches

% spread over the

year

% spread over the

year

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

Diversion Distribution

Cropland % 5.8% 5.9% 1.0% 1.4% 22.5% 9.9% 46.3% 7.2% 100.0%

JANFEBMARAPR 1.43 9.7% 1.06 3.2% 1.06 3.2% 2.14 7.4% 3.3% 80MAY 5.16 35.1% 1.62 6.4% 1.52 6.2% 0.51 3.0% 4.65 13.9% 1.17 6.0% 4.68 14.0% 3.82 13.2% 13.7% 335JUN 6.26 42.6% 3.93 15.5% 3.53 14.4% 4.76 27.6% 6.49 19.4% 3.73 19.1% 6.49 19.4% 5.26 18.1% 20.5% 492JUL 1.83 12.5% 7.58 29.9% 6.87 28.0% 8.08 46.9% 8.45 25.2% 6.08 31.2% 8.45 25.2% 7.00 24.1% 25.6% 638AUG 7.33 29.0% 7.32 29.9% 3.88 22.5% 7.29 21.8% 5.56 28.5% 7.29 21.8% 6.21 21.4% 21.7% 548SEP 4.13 16.3% 4.40 17.9% 4.14 12.4% 2.84 14.6% 4.14 12.4% 3.61 12.4% 12.0% 306OCT 0.72 2.8% 0.88 3.6% 1.39 4.2% 0.10 0.5% 1.39 4.1% 0.98 3.4% 3.4% 91NOVDECTotal 14.68 25.31 24.52 17.23 33.47 19.48 33.5 29.02 100% 2490

Combined Grains Corn for Grain Corn for Silage Dry BeansTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year%

Small Vegetables Orchards w CoverWater Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

PastureAlfalfa HayWater Requirement

Inches% spread over the

year

Page D-42

D.4.4 Lower Snake Basin Upper Salmon (UPS)

Diversion Distribution

Cropland % 0.6% 47.8% 51.6% 100.0%

JANFEBMARAPR 0.53 2.4% 1.2% 23MAY 3.01 21.4% 3.58 14.1% 2.9 12.9% 13.5% 269JUN 6.26 44.6% 5.49 21.6% 4.39 19.5% 20.6% 411JUL 4.77 34.0% 7.39 29.0% 6.07 27.0% 28.0% 558AUG 6.23 24.5% 5.28 23.5% 23.8% 475SEP 2.78 10.9% 2.93 13.0% 11.9% 237OCT 0.39 1.7% 0.9% 17NOVDECTotal 14.04 25.47 22.49 100% 1989

%Inches% spread over the

yearInches

% spread over the

yearInches

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

year

Combined Grains Alfalfa Hay

Lower Salmon (LWS)

Diversion Distribution

Cropland % 26.0% 0.3% 0.6% 73.1% 100.0%

JANFEBMARAPR 1.1 3.5% 1.1 3.5% 1.6 6.0% 5.3% 122MAY 3.82 12.1% 0.59 3.3% 3.84 12.1% 3.02 11.3% 11.4% 269JUN 5.91 18.7% 3.29 18.4% 5.91 18.6% 4.71 17.6% 17.9% 419JUL 8.12 25.6% 5.77 32.2% 8.12 25.6% 6.67 24.9% 25.1% 588AUG 7.32 23.1% 5.54 30.9% 7.32 23.1% 6.2 23.1% 23.1% 541SEP 3.95 12.5% 2.64 14.7% 3.95 12.5% 3.4 12.7% 12.6% 295OCT 1.46 4.6% 0.08 0.4% 1.45 4.6% 1.23 4.6% 4.6% 107NOVDECTotal 31.68 17.91 31.69 26.83 100% 2341

% spread over the

year%

% spread over the

yearInches

% spread over the

yearInches

Total Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year

Alfalfa Hay Small Vegetables Orchards w Cover Pasture

Inches

Grande Ronde at Wenaha (WEN)

Diversion Distribution

Cropland % 22.1% 50.1% 2.8% 1.6% 0.5% 22.8% 100.0%

JANFEBMARAPR 0.34 1.6% 0.4% 6MAY 2.54 20.5% 2.95 11.8% 0.8 3.6% 0 0.0% 2.97 11.9% 2.46 11.3% 13.2% 220JUN 5.78 46.7% 5.09 20.3% 3.72 16.9% 2.22 17.3% 5.09 20.3% 4.06 18.7% 25.7% 410JUL 4.06 32.8% 7.3 29.2% 7.52 34.2% 5.19 40.4% 7.3 29.1% 6.02 27.7% 30.0% 522AUG 6.23 24.9% 7.27 33.0% 4.5 35.0% 6.23 24.9% 5.27 24.3% 19.6% 386SEP 3.45 13.8% 2.7 12.3% 0.93 7.2% 3.45 13.8% 2.98 13.7% 10.6% 210OCT 0.01 0.0% 0.01 0.58 2.7% 0.6% 11NOVDECTotal 12.38 25.03 22.01 12.84 25.05 21.71 100% 1766

Combined Grains Sugar Beet Small Vegetables Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches Inches

% spread over the

yearInches

% spread over the

year%

Alfalfa HayWater Requirement

Inches% spread over the

year

Page D-43

Clearwater (CLR) Diversion Distribution

Cropland % 16.6% 5.5% 11.5% 66.4% 100.0%

JANFEBMARAPR 0.48 1.7% 0.48 1.7% 1.01 4.3% 3.4% 67MAY 3.42 12.3% 0.2 1.3% 3.44 12.4% 2.67 11.4% 11.1% 229JUN 5.50 19.8% 3 19.5% 5.5 19.8% 4.37 18.7% 19.1% 384JUL 7.39 26.6% 5.23 33.9% 7.39 26.6% 6.06 26.0% 26.6% 532AUG 6.69 24.1% 5.02 32.6% 6.69 24.0% 5.66 24.3% 24.7% 493SEP 3.53 12.7% 1.97 12.8% 3.53 12.7% 3.02 12.9% 12.9% 259OCT 0.79 2.8% 0.79 2.8% 0.54 2.3% 2.3% 48NOVDECTotal 27.8 15.42 27.82 23.33 100% 2012

Inches

Alfalfa Hay Small Vegetables Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%

Palouse-Lower Snake (PLS)

Diversion Distribution

Cropland % 12.7% 6.9% 2.4% 1.2% 39.8% 23.6% 7.8% 5.5% 100.0%

JANFEBMAR 0.01 0.0% 0.0% 0APR 1.19 9.4% 0.74 2.3% 0.74 2.3% 1.79 6.5% 2.7% 50MAY 4.70 37.1% 0.66 2.8% 0.59 2.6% 0.22 1.3% 4.09 12.8% 0.32 1.8% 4.11 12.9% 3.31 12.0% 12.2% 239JUN 5.61 44.2% 3.54 15.0% 3.17 13.9% 4.28 25.6% 6.19 19.4% 3.37 18.8% 6.19 19.4% 4.98 18.0% 22.0% 426JUL 1.18 9.3% 7.39 31.4% 6.64 29.2% 8.08 48.3% 8.39 26.3% 5.96 33.3% 8.39 26.2% 6.93 25.1% 26.4% 559AUG 7.2 30.5% 7.16 31.4% 4.14 24.8% 7.15 22.4% 5.43 30.3% 7.15 22.4% 6.06 21.9% 22.2% 478SEP 4.01 17.0% 4.26 18.7% 3.98 12.5% 2.74 15.3% 3.98 12.4% 3.45 12.5% 11.9% 259OCT 0.77 3.3% 0.95 4.2% 1.42 4.4% 0.08 0.4% 1.42 4.4% 1.1 4.0% 2.8% 69NOVDECTotal 12.68 23.57 22.77 16.72 31.96 17.9 31.98 27.63 100% 2081

PastureAlfalfa HayWater Requirement

Inches% spread over the

year

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInchesInches

% spread over the

yearInches

Water Requirement Water Requirement Water Requirement Water RequirementTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year%

Small Vegetables Orchards w CoverCombined Grains Corn for Grain Corn for Silage Dry Beans

Page D-44

D.4.5 Lower Columbia Basin Walla Walla (WWA)

Diversion Distribution

Cropland % 21.9% 7.0% 0.2% 1.1% 24.0% 24.5% 13.6% 7.7% 100.0%

JANFEBMARAPR 1.1 10.0% 0.75 2.8% 0.75 2.8% 1.55 6.4% 3.7% 54MAY 4.48 40.8% 0.61 3.2% 0.54 2.9% 3.82 14.1% 0.33 2.3% 3.84 14.1% 3.08 12.7% 16.0% 232JUN 4.80 43.7% 3.73 19.5% 3.29 17.5% 3.38 22.7% 5.69 21.0% 3.4 24.0% 5.69 20.9% 4.59 18.9% 26.4% 390JUL 0.61 5.6% 7.03 36.7% 6.65 35.4% 7.18 48.2% 7.42 27.3% 5.43 38.3% 7.42 27.3% 6.14 25.3% 26.0% 443AUG 5.95 31.1% 6.21 33.0% 4.35 29.2% 6.17 22.7% 4.29 30.2% 6.17 22.7% 5.23 21.5% 20.2% 354SEP 1.84 9.6% 2.12 11.3% 3.3 12.2% 0.74 5.2% 3.3 12.1% 3.02 12.4% 7.5% 149OCT 0.67 2.8% 0.2% 4NOVDECTotal 10.99 19.16 18.81 14.91 27.15 14.19 27.17 24.28 100% 1626

Combined Grains Corn for Grain Corn for Silage Dry BeansTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year%

Small Vegetables Orchards w CoverWater Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

Alfalfa HayWater Requirement

Inches% spread over the

year

Pasture

Umatilla (UMP, UMR, JDP, UMW)

Diversion Distribution

Cropland % 17.1% 8.4% 0.5% 1.0% 33.6% 24.5% 2.9% 12.1% 100.0%

JANFEBMARAPR 0.41 3.6% 0.38 1.5% 0.38 1.5% 1.04 4.5% 1.7% 28MAY 3.69 32.7% 0.11 0.6% 0.08 0.5% 3.36 12.9% 3.37 12.9% 2.67 11.6% 11.7% 182JUN 5.32 47.1% 3.05 16.8% 2.72 15.3% 1.6 11.1% 5.33 20.4% 2.74 20.3% 5.33 20.4% 4.28 18.6% 24.3% 361JUL 1.87 16.6% 6.86 37.8% 6.35 35.8% 6.92 47.8% 7.46 28.5% 5.41 40.2% 7.46 28.5% 6.17 26.8% 30.1% 482AUG 6.06 33.4% 6.24 35.2% 5.37 37.1% 6.19 23.7% 4.43 32.9% 6.19 23.7% 5.24 22.8% 22.8% 381SEP 2.06 11.4% 2.36 13.3% 0.58 4.0% 3.42 13.1% 0.89 6.6% 3.42 13.1% 2.96 12.9% 9.0% 168OCT 0.62 2.7% 0.3% 6NOVDECTotal 11.29 18.14 17.75 14.47 26.14 13.47 26.15 22.98 100% 1608

% spread over the

year

Combined Grains Corn for Grain Corn for Silage Dry Beans Alfalfa Hay Small Vegetables Orchards w Cover PastureWater Requirement Water Requirement Water Requirement Water RequirementWater Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches Inches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%

Total Water Required by Crops (ac-

ft/1000 acres)

Northside Pumping (NSM, NSR, NSJ)

Diversion Distribution

Cropland % 9.5% 7.0% 0.5% 0.1% 18.9% 0.8% 32.8% 20.3% 10.1% 100.0%

JANFEBMAR 0.05 0.2% 0.0% 0APR 1.96 15.1% 0 0.0% 0 0.0% 0.0% 1.49 4.3% 1.27 3.6% 0 0.0% 1.49 4.3% 2.19 7.3% 3.9% 83MAY 5.44 41.8% 1.86 7.0% 1.75 6.8% 0.47 1.9% 4.64 13.4% 3.36 9.5% 1.38 6.7% 4.66 13.4% 3.81 12.8% 13.3% 279JUN 5.14 39.5% 3.96 14.8% 3.58 13.9% 3.81 15.5% 6.56 18.9% 5.84 16.5% 3.79 18.3% 6.56 18.9% 5.34 17.9% 20.2% 432JUL 0.46 3.5% 7.39 27.7% 6.61 25.7% 7.36 30.0% 8.45 24.4% 8.87 25.1% 6.03 29.1% 8.45 24.4% 7.01 23.5% 24.1% 556AUG 7.39 27.7% 7.24 28.1% 7.6 31.0% 7.31 21.1% 8.59 24.3% 5.64 27.2% 7.31 21.1% 6.22 20.8% 21.6% 498SEP 4.43 16.6% 4.63 18.0% 4.13 16.9% 4.29 12.4% 5.24 14.8% 3.21 15.5% 4.29 12.4% 3.74 12.5% 12.6% 291OCT 1.67 6.3% 1.92 7.5% 1.14 4.7% 1.94 5.6% 2.17 6.1% 0.65 3.1% 1.94 5.6% 1.51 5.1% 4.3% 106NOVDECTotal 13 26.7 25.73 24.51 34.68 35.34 20.7 34.7 29.87 100% 2245

Dry Beans

Inches% spread over the

year

Corn for SilageWater Requirement

Inches% spread over the

year

Combined Grains Corn for Grain

Inches% spread over the

yearInches

% spread over the

year

Alfalfa Hay Sugar Beet Small Vegetables Orchards w CoverWater Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

year%Inches

% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Klickitat (KLC)

Diversion Distribution

Cropland % 9.5% 7.0% 0.5% 0.1% 18.9% 0.8% 32.8% 20.3% 10.1% 100.0%

JANFEBMARAPRMAY 1.17 10.0% 1.04 6.4% 1.04 6.4% 2.1 13.2% 4.8% 61JUN 4.42 37.7% 0.64 7.7% 0.57 7.0% 0.42 4.2% 4.12 25.2% 1.03 10.3% 0.48 8.0% 4.12 25.2% 3.31 20.9% 18.9% 215JUL 5.33 45.5% 4.85 58.6% 4.56 55.7% 4.55 45.7% 5.49 33.6% 5.47 54.8% 3.9 65.0% 5.49 33.6% 4.55 28.7% 46.6% 401AUG 0.80 6.8% 2.79 33.7% 3.05 37.3% 4.52 45.4% 4.86 29.7% 3.48 34.9% 1.62 27.0% 4.86 29.7% 4.14 26.1% 26.7% 264SEP 0.47 4.7% 0.84 5.1% 0.84 5.1% 1.77 11.2% 3.1% 42OCTNOVDECTotal 11.72 8.28 8.18 9.96 16.35 9.98 6 16.35 15.87 100% 984

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%

Orchards w CoverSmall VegetablesSugar Beet

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Alfalfa HayDry BeansCorn for GrainCombined Grains Corn for SilageWater Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Page D-45

John Day (JDA) Diversion Distribution

Cropland % 2.2% 0.5% 58.8% 1.5% 0.4% 36.7% 100.0%

JANFEBMARAPR 0.4 1.8% 0.7% 12MAY 2.58 20.5% 0.01 0.1% 2.91 11.9% 2.93 11.9% 2.5 11.5% 11.7% 225JUN 5.81 46.2% 2.63 15.8% 5.12 20.9% 2.24 18.2% 5.12 20.9% 4.09 18.8% 20.6% 392JUL 4.18 33.3% 6.39 38.3% 7.12 29.1% 5.08 41.3% 7.12 29.0% 5.87 27.0% 28.6% 547AUG 5.93 35.6% 6.08 24.8% 4.3 34.9% 6.08 24.8% 5.14 23.6% 24.0% 465SEP 1.71 10.3% 3.27 13.3% 0.69 5.6% 3.27 13.3% 2.98 13.7% 13.1% 254OCT 0.77 3.5% 1.3% 24NOVDECTotal 12.57 16.67 1 24.5 12.31 24.52 21.75 100% 1918

%Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover

Inches

Water RequirementCorn for Grain

% spread over the

year

Deschutes - White River Wapanita (WHT) Diversion Distribution

Cropland % 8.3% 26.1% 37.2% 28.3% 100.0%

JANFEBMARAPR 0.08 0.4% 0.1% 2MAY 1.45 10.9% 1.05 5.6% 1.06 5.6% 2.4 12.6% 8.0% 122JUN 4.86 36.7% 4.58 24.4% 4.58 24.4% 3.69 19.4% 24.0% 363JUL 6.01 45.3% 6.08 32.4% 6.08 32.4% 5.01 26.3% 31.7% 481AUG 0.94 7.1% 5.33 28.4% 5.33 28.4% 4.52 23.8% 25.3% 395SEP 1.73 9.2% 1.73 9.2% 2.72 14.3% 9.9% 156OCT 0.6 3.2% 0.9% 14NOVDECTotal 13.26 18.77 18.78 19.02 100% 1532

%Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

yearInches

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

year

Combined Grains Alfalfa Hay Orchards w Cover

Hood River (HOD)

Diversion Distribution

Cropland % 4.5% 18.1% 0.1% 59.1% 18.2% 100.0%

JANFEBMARAPR 0.52 4.9% 0.3 1.2% 0.35 1.4% 0.9 4.3% 2.1% 37MAY 4.01 37.5% 3.56 14.5% 3.58 14.5% 2.88 13.7% 15.4% 289JUN 4.97 46.5% 5.25 21.4% 2.72 21.2% 5.25 21.3% 4.24 20.2% 22.3% 421JUL 1.18 11.0% 6.59 26.8% 4.71 36.8% 6.59 26.7% 5.46 26.0% 25.9% 511AUG 5.51 22.4% 4.12 32.2% 5.51 22.4% 4.67 22.3% 21.4% 426SEP 3.04 12.4% 1.26 9.8% 3.04 12.3% 2.6 12.4% 11.8% 235OCT 0.33 1.3% 0.33 1.3% 0.21 1.0% 1.2% 24NOVDECTotal 10.68 24.58 12.81 24.65 20.96 100% 1943

% spread over the

yearInches

% spread over the

yearInches %

Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year

Combined Grains Alfalfa Hay Small Vegetables Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement

Page D-46

White Salmon (WHS) Diversion Distribution

Cropland % 4.8% 32.8% 36.5% 25.9% 100.0%

JANFEBMARAPRMAY 1.69 14.0% 1.55 7.8% 1.56 7.9% 2.07 11.8% 9.2% 141JUN 5.19 43.0% 4.58 23.1% 4.58 23.1% 3.67 21.0% 23.5% 364JUL 5.14 42.6% 6.38 32.1% 6.38 32.1% 5.27 30.1% 32.1% 503AUG 0.04 0.3% 5.34 26.9% 5.34 26.9% 4.52 25.8% 25.4% 406SEP 2 10.1% 2 10.1% 1.96 11.2% 9.9% 158OCTNOVDECTotal 12.06 19.85 19.86 17.49 100% 1573

%% spread over the

yearInches

% spread over the

year

PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement

% spread over the

yearInches

% spread over the

yearInchesInches

Combined Grains Alfalfa Hay Orchards w Cover

Page D-47

D.4.6 Willamette Basin Willamette (WMT)

Diversion Distribution

Cropland % 3.3% 0.1% 10.1% 24.1% 44.7% 9.9% 7.8% 100.0%

JANFEBMARAPR 0.52 10.2% 0.3% 1MAY 3.08 60.4% 2.56 11.8% 1.04 6.4% 2.1 13.2% 6.5% 82JUN 1.50 29.4% 1.78 11.6% 1.57 10.6% 4.37 20.1% 1.45 12.9% 4.12 25.2% 3.31 20.9% 16.8% 215JUL 5.06 33.0% 4.47 30.2% 6.17 28.4% 4.23 37.7% 5.49 33.6% 4.55 28.7% 32.3% 394AUG 5.32 34.7% 5.22 35.2% 5.27 24.3% 3.97 35.4% 4.86 29.7% 4.14 26.1% 30.2% 365SEP 3.17 20.7% 3.39 22.9% 3.14 14.5% 1.57 14.0% 0.84 5.1% 1.77 11.2% 13.5% 169OCT 0.01 0.1% 0.16 1.1% 0.2 0.9% 0.3% 5NOVDECTotal 5.1 15.34 14.81 21.71 11.22 16.35 15.87 100% 1232

Combined Grains Alfalfa Hay Small Vegetables

Inches% spread over the

yearInches

% spread over the

year

% spread over the

year

% spread over the

year

Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%

Corn for Grain Corn for SilageWater Requirement Water Requirement

Inches Inches

Fern Ridge (FRN)

Diversion Distribution

Cropland % 8.8% 47.9% 16.2% 12.0% 15.2% 100.0%

JANFEBMARAPR 0.26 1.1% 0.26 1.1% 0.35 1.8% 0.9% 17MAY 2.92 12.4% 2.93 12.4% 2.28 11.8% 9.2% 175JUN 1.77 11.1% 4.6 19.5% 1.58 12.9% 4.6 19.5% 3.65 18.8% 17.6% 310JUL 4.24 26.6% 6.27 26.5% 4.18 34.1% 6.27 26.5% 5.17 26.6% 27.8% 466AUG 5.32 33.4% 5.56 23.5% 4.24 34.6% 5.56 23.5% 4.7 24.2% 26.3% 433SEP 3.66 23.0% 3.34 14.1% 2.27 18.5% 3.34 14.1% 2.85 14.7% 15.7% 260OCT 0.92 5.8% 0.67 2.8% 0.66 2.8% 0.4 2.1% 2.5% 45NOVDECTotal 15.91 23.62 12.27 23.62 19.4 100% 1705

Corn for Silage Alfalfa Hay Small Vegetables Orchards w Cover PastureTotal Water Required by Crops (ac-

ft/1000 acres)

Water Requirement Water Requirement Water Requirement Water Requirement Water Requirement

Inches% spread over the

yearInches

% spread over the

yearInches

% spread over the

year%Inches

% spread over the

yearInches

% spread over the

year

Page D-48

D.5 Diversion and Return Flow Volumes (ac-ft/1000 ac) based on Sprinkler/Gravity Efficiencies

D.5.1 Upper Columbia and Kootenay Basins Upper Columbia above Mica (UPC)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1168 1168

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -1854 -2336Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 612 1051 Hugh Keenleyside (ARD)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1258 1258

Diversion Efficiency (%) 74% 50%Required Diversion (ac-ft per 1000 ac) -1700 -2516Return Efficiency (%) 22% 45%Return Flow (ac-ft per 1000 ac) 374 1132 East Kootenay (EKO)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1464 1464

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2323 -2928Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 767 1317 West Kootenay (WKO)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1350 1350

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2143 -2701Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 707 1215 Kootenai-Montana (KMT)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1727 1727

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2741 -3454Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 905 1554

Page D-49

Kootenai-Idaho (KID)Sprinkler Gravity

Total Volume of Water Required by crops (ac-ft per 1000 ac)

1619 1619

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2570 -3238Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 848 1457 Brilliant (BRI)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1430 1430

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2269 -2860Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 749 1287 Columbia at Trail (CTR)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1399 1399

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2220 -2797Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 733 1259

Page D-50

D.5.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1238 1238

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -1965 -2476Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 648 1114 Flathead Irrigation District (FID)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1637 1637

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2598 -3273Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 857 1473 Bitterroot (BIT)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1659 1659

Diversion Efficiency (%) 67% 50%Required Diversion (ac-ft per 1000 ac) -2476 -3318Return Efficiency (%) 29% 45%Return Flow (ac-ft per 1000 ac) 718 1493 Upper Clark Fork (UCF)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1149 1149

Diversion Efficiency (%) 67% 50%Required Diversion (ac-ft per 1000 ac) -1714 -2297Return Efficiency (%) 29% 45%Return Flow (ac-ft per 1000 ac) 497 1034 Lower Clark Fork (LCF)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1642 1642

Diversion Efficiency (%) 68% 50%Required Diversion (ac-ft per 1000 ac) -2414 -3283Return Efficiency (%) 28% 45%Return Flow (ac-ft per 1000 ac) 676 1477

Page D-51

Pend Oreille Basin in USA (PEN)Sprinkler Gravity

Total Volume of Water Required by crops (ac-ft per 1000 ac)

1401 1401

Diversion Efficiency (%) 74% 50%Required Diversion (ac-ft per 1000 ac) -1893 -2802Return Efficiency (%) 22% 45%Return Flow (ac-ft per 1000 ac) 417 1261 Pend Oreille Basin in Canada (POC)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1551 1551

Diversion Efficiency (%) 74% 50%Required Diversion (ac-ft per 1000 ac) -2096 -3103Return Efficiency (%) 22% 45%Return Flow (ac-ft per 1000 ac) 461 1396 Spokane (SPV)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1759 1759

Diversion Efficiency (%) 81% 45%Required Diversion (ac-ft per 1000 ac) -2172 -3909Return Efficiency (%) 16% 50%Return Flow (ac-ft per 1000 ac) 347 1955

Page D-52

D.5.3 Mid-Columbia Basin Kettle (KET)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1529 1529

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2426 -3057Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 801 1376 Methow-Okanogan (OKM)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1980 1980

Diversion Efficiency (%) 57% 50%Required Diversion (ac-ft per 1000 ac) -3473 -3959Return Efficiency (%) 39% 45%Return Flow (ac-ft per 1000 ac) 1354 1782 Kettle (KET)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1657 1657

Diversion Efficiency (%) 63% 50%Required Diversion (ac-ft per 1000 ac) -2631 -3315Return Efficiency (%) 33% 45%Return Flow (ac-ft per 1000 ac) 868 1492 Ferry-Stevens (FER)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1679 1679

Diversion Efficiency (%) 81% 45%Required Diversion (ac-ft per 1000 ac) -2073 -3731Return Efficiency (%) 16% 50%Return Flow (ac-ft per 1000 ac) 332 1866 Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

2490 2490

Diversion Efficiency (%) 55% 50%Required Diversion (ac-ft per 1000 ac) -4527 -4980Return Efficiency (%) 41% 45%Return Flow (ac-ft per 1000 ac) 1856 2241

Page D-53

D.5.4 Lower Snake Basin Upper Salmon (UPS)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1989 1989

Diversion Efficiency (%) 67% 50%Required Diversion (ac-ft per 1000 ac) -2968 -3978Return Efficiency (%) 29% 45%Return Flow (ac-ft per 1000 ac) 861 1790 Lower Salmon (LWS)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

2341 2341

Diversion Efficiency (%) 66% 50%Required Diversion (ac-ft per 1000 ac) -3547 -4682Return Efficiency (%) 30% 45%Return Flow (ac-ft per 1000 ac) 1064 2107 Grande Ronde at Wenaha (WEN)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1766 1766

Diversion Efficiency (%) 86% 45%Required Diversion (ac-ft per 1000 ac) -2053 -3924Return Efficiency (%) 10% 50%Return Flow (ac-ft per 1000 ac) 205 1962 Clearwater (CLR)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

2012 2012

Diversion Efficiency (%) 76% 50%Required Diversion (ac-ft per 1000 ac) -2648 -4024Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 530 1811 Palouse-Lower Snake (PLS)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

2081 2081

Diversion Efficiency (%) 76% 50%Required Diversion (ac-ft per 1000 ac) -2738 -4161Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 548 1872

Page D-54

D.5.5 Lower Columbia Basin Walla Walla (WWA)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1626 1626

Diversion Efficiency (%) 80% 50%Required Diversion (ac-ft per 1000 ac) -2032 -3252Return Efficiency (%) 16% 45%Return Flow (ac-ft per 1000 ac) 325 1463 Umatilla Pumping (UMP, UMR, JDP)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1608 1608

Diversion Efficiency (%) 75% 50%Required Diversion (ac-ft per 1000 ac) -2144 -3217Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 429 1447 Umatilla River & Willow Creek (UMW)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1608 1608

Diversion Efficiency (%) 90% 45%Required Diversion (ac-ft per 1000 ac) -1787 -3574Return Efficiency (%) 6% 50%Return Flow (ac-ft per 1000 ac) 107 1787 Northside Pumping (NSM, NSR, NSJ)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

2245 2245

Diversion Efficiency (%) 75% 50%Required Diversion (ac-ft per 1000 ac) -2993 -4490Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 599 2021 John Day (JDA)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1918 1918

Diversion Efficiency (%) 78% 50%Required Diversion (ac-ft per 1000 ac) -2459 -3836Return Efficiency (%) 18% 45%Return Flow (ac-ft per 1000 ac) 443 1726

Page D-55

Deschutes - White River Wapanita (WHT)Sprinkler Gravity

Total Volume of Water Required by crops (ac-ft per 1000 ac)

1532 1532

Diversion Efficiency (%) 50% 50%Required Diversion (ac-ft per 1000 ac) -3064 -3064Return Efficiency (%) 40% 40%Return Flow (ac-ft per 1000 ac) 1226 1226 Klickitat (KLC)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

984 984

Diversion Efficiency (%) 50% 50%Required Diversion (ac-ft per 1000 ac) -1968 -1968Return Efficiency (%) 40% 40%Return Flow (ac-ft per 1000 ac) 787 787 Hood River (HOD)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1943 1943

Diversion Efficiency (%) 84% 45%Required Diversion (ac-ft per 1000 ac) -2313 -4318Return Efficiency (%) 12% 50%Return Flow (ac-ft per 1000 ac) 278 2159 White Salmon (WHS)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1573 1573

Diversion Efficiency (%) 50% 50%Required Diversion (ac-ft per 1000 ac) -3145 -3145Return Efficiency (%) 40% 40%Return Flow (ac-ft per 1000 ac) 1258 1258

Page D-56

D.5.6 Willamette Basin Willamette (WMT)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1232 1232

Diversion Efficiency (%) 76% 50%Required Diversion (ac-ft per 1000 ac) -1621 -2464Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 324 1109 Fern Ridge (FRN)

Sprinkler GravityTotal Volume of Water Required by crops (ac-ft per 1000 ac)

1705 1705

Diversion Efficiency (%) 76% 50%Required Diversion (ac-ft per 1000 ac) -2244 -3410Return Efficiency (%) 20% 45%Return Flow (ac-ft per 1000 ac) 449 1535

Page D-57

D.6 Depletions per Unit Area

D.6.1 Upper Columbia and Kootenay Basins Upper Columbia above Mica (UPC)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 6.0% 37 37 0.6 JAN 6.0% 63 63 1.0FEB 0.0% 5.0% 31 31 0.6 FEB 5.0% 53 53 0.9MAR 0.0% 4.0% 25 25 0.4 MAR 4.0% 42 42 0.7APR 0.7% -13 4.0% 25 12 0.2 APR 0.7% -16 4.0% 42 26 0.4MAY 14.2% -263 7.0% 43 -220 -3.6 MAY 14.2% -331 7.0% 74 -258 -4.2JUN 21.7% -403 9.0% 55 -348 -5.8 JUN 21.7% -508 9.0% 95 -413 -6.9JUL 29.8% -552 11.0% 67 -485 -7.9 JUL 29.8% -695 11.0% 116 -580 -9.4AUG 25.8% -479 13.0% 80 -400 -6.5 AUG 25.8% -604 13.0% 137 -467 -7.6SEP 7.8% -145 14.0% 86 -59 -1.0 SEP 7.8% -182 14.0% 147 -35 -0.6OCT 11.0% 67 67 1.1 OCT 11.0% 116 116 1.9NOV 0.0% 9.0% 55 55 0.9 NOV 9.0% 95 95 1.6DEC 0.0% 7.0% 43 43 0.7 DEC 7.0% 74 74 1.2

0.0 0.0Total = 100.0% -1854 100.0% 612 -1243 Total = 100.0% -2336 100.0% 1051 -1285

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Hugh Keenleyside (ARD)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 7.0% 26 26 0.4 JAN 7.0% 79 79 1.3FEB 6.0% 22 22 0.4 FEB 6.0% 68 68 1.2MAR 5.0% 19 19 0.3 MAR 5.0% 57 57 0.9APR 2.5% -42 4.0% 15 -27 -0.5 APR 2.5% -62 4.0% 45 -17 -0.3MAY 15.1% -257 5.0% 19 -238 -3.9 MAY 15.1% -381 5.0% 57 -324 -5.3JUN 22.1% -376 8.0% 30 -346 -5.8 JUN 22.1% -557 8.0% 91 -466 -7.8JUL 27.7% -471 10.0% 37 -433 -7.0 JUL 27.7% -697 10.0% 113 -584 -9.5AUG 22.9% -390 14.0% 52 -338 -5.5 AUG 22.9% -577 14.0% 159 -419 -6.8SEP 8.1% -138 12.0% 45 -93 -1.6 SEP 8.1% -204 12.0% 136 -68 -1.1OCT 1.5% -26 11.0% 41 15 0.3 OCT 1.5% -38 11.0% 125 87 1.4NOV 10.0% 37 37 0.6 NOV 10.0% 113 113 1.9DEC 8.0% 30 30 0.5 DEC 8.0% 91 91 1.5

0.0 0.0Total = 100.0% -1700 100.0% 374 -1326 Total = 100.0% -2516 100.0% 1132 -1384

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

East Kootenay (EKO)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 6.0% 46 46 0.7 JAN 6.0% 79 79 1.3FEB 5.0% 38 38 0.7 FEB 5.0% 66 66 1.2MAR 4.0% 31 31 0.5 MAR 4.0% 53 53 0.9APR 1.7% -41 4.0% 31 -10 -0.2 APR 1.7% -51 4.0% 53 2 0.0MAY 12.7% -294 7.0% 54 -241 -3.9 MAY 12.7% -371 7.0% 92 -279 -4.5JUN 19.1% -444 9.0% 69 -375 -6.3 JUN 19.1% -560 9.0% 119 -441 -7.4JUL 28.2% -656 11.0% 84 -571 -9.3 JUL 28.2% -826 11.0% 145 -681 -11.1AUG 25.0% -580 13.0% 100 -481 -7.8 AUG 25.0% -731 13.0% 171 -560 -9.1SEP 12.5% -290 14.0% 107 -183 -3.1 SEP 12.5% -365 14.0% 184 -181 -3.0OCT 0.8% -18 11.0% 84 66 1.1 OCT 0.8% -23 11.0% 145 122 2.0NOV 9.0% 69 69 1.2 NOV 9.0% 119 119 2.0DEC 7.0% 54 54 0.9 DEC 7.0% 92 92 1.5

0.0 0.0Total = 100.0% -2323 100.0% 767 -1557 Total = 100.0% -2927 100.0% 1317 -1610

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-58

West Kootenay (WKO)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 7.0% 50 50 0.8 JAN 7.0% 85 85 1.4FEB 6.0% 42 42 0.8 FEB 6.0% 73 73 1.3MAR 5.0% 35 35 0.6 MAR 5.0% 61 61 1.0APR 4.0% 28 28 0.5 APR 4.0% 49 49 0.8MAY 11.7% -250 5.0% 35 -215 -3.5 MAY 11.7% -315 5.0% 61 -255 -4.1JUN 25.2% -541 8.0% 57 -484 -8.1 JUN 25.2% -681 8.0% 97 -584 -9.8JUL 34.1% -730 10.0% 71 -659 -10.7 JUL 34.1% -920 10.0% 122 -798 -13.0AUG 21.9% -469 14.0% 99 -370 -6.0 AUG 21.9% -591 14.0% 170 -420 -6.8SEP 7.2% -154 12.0% 85 -69 -1.2 SEP 7.2% -194 12.0% 146 -48 -0.8OCT 11.0% 78 78 1.3 OCT 11.0% 134 134 2.2NOV 10.0% 71 71 1.2 NOV 10.0% 122 122 2.0DEC 8.0% 57 57 0.9 DEC 8.0% 97 97 1.6

0.0 0.0Total = 100.0% -2143 100.0% 707 -1436 Total = 100.0% -2701 100.0% 1215 -1485

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Kootenai-Montana (KMT)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 7.0% 63 63 1.0 JAN 0.0% 0 7.0% 109 109 1.8FEB 0.0% 0 6.0% 54 54 1.0 FEB 0.0% 0 6.0% 93 93 1.7MAR 0.0% 0 5.0% 45 45 0.7 MAR 0.0% 0 5.0% 78 78 1.3APR 0.5% -13 4.0% 36 24 0.4 APR 0.5% -16 4.0% 62 46 0.8MAY 13.7% -375 5.0% 45 -330 -5.4 MAY 13.7% -472 5.0% 78 -395 -6.4JUN 21.3% -584 8.0% 72 -512 -8.6 JUN 21.3% -736 8.0% 124 -612 -10.3JUL 28.7% -787 10.0% 90 -696 -11.3 JUL 28.7% -991 10.0% 155 -836 -13.6AUG 25.3% -694 14.0% 127 -567 -9.2 AUG 25.3% -874 14.0% 218 -657 -10.7SEP 10.5% -289 12.0% 109 -180 -3.0 SEP 10.5% -364 12.0% 187 -178 -3.0OCT 0.0% 0 11.0% 100 100 1.6 OCT 0.0% 0 11.0% 171 171 2.8NOV 0.0% 0 10.0% 90 90 1.5 NOV 0.0% 0 10.0% 155 155 2.6DEC 0.0% 0 8.0% 72 72 1.2 DEC 0.0% 0 8.0% 124 124 2.0

0Total = 100.0% -2741 100.0% 905 -1837 Total = 100.0% -3454 100.0% 1554 -1900

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Kootenai-Idaho (KID)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 7.0% 59 59 1.0 JAN 0.0% 0 7.0% 102 102 1.7FEB 0.0% 0 6.0% 51 51 0.9 FEB 0.0% 0 6.0% 87 87 1.6MAR 0.0% 0 5.0% 42 42 0.7 MAR 0.0% 0 5.0% 73 73 1.2APR 0.1% -2 4.0% 34 32 0.5 APR 0.1% -3 4.0% 58 55 0.9MAY 10.8% -277 5.0% 42 -235 -3.8 MAY 10.8% -349 5.0% 73 -277 -4.5JUN 21.3% -548 8.0% 68 -481 -8.1 JUN 21.3% -691 8.0% 117 -574 -9.7JUL 31.8% -817 10.0% 85 -732 -11.9 JUL 31.8% -1029 10.0% 146 -883 -14.4AUG 27.1% -695 14.0% 119 -577 -9.4 AUG 27.1% -876 14.0% 204 -672 -10.9SEP 8.9% -230 12.0% 102 -128 -2.1 SEP 8.9% -289 12.0% 175 -114 -1.9OCT 0.0% 0 11.0% 93 93 1.5 OCT 0.0% 0 11.0% 160 160 2.6NOV 0.0% 0 10.0% 85 85 1.4 NOV 0.0% 0 10.0% 146 146 2.4DEC 0.0% 0 8.0% 68 68 1.1 DEC 0.0% 0 8.0% 117 117 1.9

0Total = 100.0% -2570 100.0% 848 -1722 Total = 100.0% -3238 100.0% 1457 -1781

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-59

Brilliant (BRI)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 6.0% 45 45 0.7 JAN 6.0% 77 77 1.3FEB 5.0% 37 37 0.7 FEB 5.0% 64 64 1.2MAR 4.0% 30 30 0.5 MAR 4.0% 51 51 0.8APR 4.0% 30 30 0.5 APR 4.0% 52 52 0.9MAY 12.5% -285 7.0% 52 -233 -3.8 MAY 12.5% -359 7.0% 90 -269 -4.4JUN 21.3% -483 9.0% 67 -416 -7.0 JUN 21.3% -609 9.0% 116 -493 -8.3JUL 29.7% -674 11.0% 82 -592 -9.6 JUL 29.7% -849 11.0% 142 -708 -11.5AUG 25.2% -573 13.0% 97 -476 -7.7 AUG 25.2% -722 13.0% 167 -555 -9.0SEP 11.2% -254 14.0% 105 -149 -2.5 SEP 11.2% -321 14.0% 180 -141 -2.4OCT 11.0% 82 82 1.3 OCT 11.0% 142 142 2.3NOV 9.0% 67 67 1.1 NOV 9.0% 116 116 1.9DEC 7.0% 52 52 0.9 DEC 7.0% 90 90 1.5

0.0 0.0Total = 100.0% -2269 100.0% 749 -1520 Total = 100.0% -2860 100.0% 1287 -1573

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Columbia at Trail (CTR)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 6.0% 44 44 0.7 JAN 6.0% 76 76 1.2FEB 5.0% 37 37 0.7 FEB 5.0% 63 63 1.1MAR 4.0% 29 29 0.5 MAR 4.0% 50 50 0.8APR 4.0% 29 29 0.5 APR 4.0% 50 50 0.8MAY 12.3% -274 7.0% 51 -223 -3.6 MAY 12.3% -345 7.0% 88 -257 -4.2JUN 22.1% -491 9.0% 66 -425 -7.1 JUN 22.1% -618 9.0% 113 -505 -8.5JUL 30.6% -679 11.0% 81 -599 -9.7 JUL 30.6% -856 11.0% 139 -717 -11.7AUG 24.5% -543 13.0% 95 -448 -7.3 AUG 24.5% -684 13.0% 164 -520 -8.5SEP 10.5% -233 14.0% 103 -131 -2.2 SEP 10.5% -294 14.0% 176 -118 -2.0OCT 11.0% 81 81 1.3 OCT 11.0% 139 139 2.3NOV 9.0% 66 66 1.1 NOV 9.0% 113 113 1.9DEC 7.0% 51 51 0.8 DEC 7.0% 88 88 1.4

0.0 0.0Total = 100.0% -2220 100.0% 733 -1487 Total = 100.0% -2797 100.0% 1259 -1538

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Page D-60

D.6.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 6.0% 39 39 0.6 JAN 0.0% 0 6.0% 67 67 1.1FEB 0.0% 0 5.0% 32 32 0.6 FEB 0.0% 0 5.0% 56 56 1.0MAR 0.0% 0 5.0% 32 32 0.5 MAR 0.0% 0 5.0% 56 56 0.9APR 0.1% -1 5.0% 32 31 0.5 APR 0.1% -1 5.0% 56 54 0.9MAY 8.6% -169 9.0% 58 -111 -1.8 MAY 8.6% -213 9.0% 100 -113 -1.8JUN 28.5% -559 10.0% 65 -495 -8.3 JUN 28.5% -705 10.0% 111 -594 -10.0JUL 38.9% -764 11.0% 71 -692 -11.3 JUL 38.9% -962 11.0% 123 -840 -13.7AUG 18.7% -367 12.0% 78 -290 -4.7 AUG 18.7% -463 12.0% 134 -329 -5.4SEP 5.3% -104 11.0% 71 -33 -0.6 SEP 5.3% -131 11.0% 123 -9 -0.1OCT 0.0% 0 10.0% 65 65 1.1 OCT 0.0% 0 10.0% 111 111 1.8NOV 0.0% 0 9.0% 58 58 1.0 NOV 0.0% 0 9.0% 100 100 1.7DEC 0.0% 0 7.0% 45 45 0.7 DEC 0.0% 0 7.0% 78 78 1.3

0Total = 100.0% -1965 100.0% 648 -1317 Total = 100.0% -2476 100.0% 1114 -1362

RETURN FLOW DEPLETIONDEPLETION DIVERSIONDIVERSION RETURN FLOW

Flathead Irrigation District (FID)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 6.0% 51 51 0.8 JAN 0.0% 0 6.0% 88 88 1.4FEB 0.0% 0 5.0% 43 43 0.8 FEB 0.0% 0 5.0% 74 74 1.3MAR 0.0% 0 5.0% 43 43 0.7 MAR 0.0% 0 5.0% 74 74 1.2APR 0.5% -14 5.0% 43 29 0.5 APR 0.5% -18 5.0% 74 56 0.9MAY 11.7% -303 9.0% 77 -226 -3.7 MAY 11.7% -382 9.0% 133 -249 -4.1JUN 21.6% -562 10.0% 86 -476 -8.0 JUN 21.6% -708 10.0% 147 -561 -9.4JUL 29.9% -777 11.0% 94 -683 -11.1 JUL 29.9% -979 11.0% 162 -817 -13.3AUG 23.9% -620 12.0% 103 -517 -8.4 AUG 23.9% -781 12.0% 177 -604 -9.8SEP 11.6% -302 11.0% 94 -207 -3.5 SEP 11.6% -380 11.0% 162 -218 -3.7OCT 0.8% -20 10.0% 86 66 1.1 OCT 0.8% -25 10.0% 147 122 2.0NOV 0.0% 0 9.0% 77 77 1.3 NOV 0.0% 0 9.0% 133 133 2.2DEC 0.0% 0 7.0% 60 60 1.0 DEC 0.0% 0 7.0% 103 103 1.7

0Total = 100.0% -2598 100.0% 857 -1741 Total = 100.0% -3273 100.0% 1473 -1800

RETURN FLOW DEPLETIONDEPLETION DIVERSIONDIVERSION RETURN FLOW

Bitterroot (BIT)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 5.0% 36 36 0.6 JAN 0.0% 0 5.0% 75 75 1.2FEB 0.0% 0 4.0% 29 29 0.5 FEB 0.0% 0 4.0% 60 60 1.1MAR 0.0% 0 4.0% 29 29 0.5 MAR 0.0% 0 4.0% 60 60 1.0APR 0.7% -16 4.0% 29 13 0.2 APR 0.7% -22 4.0% 60 38 0.6MAY 10.9% -271 9.0% 65 -206 -3.4 MAY 10.9% -363 9.0% 134 -228 -3.7JUN 22.1% -548 10.0% 72 -476 -8.0 JUN 22.1% -734 10.0% 149 -584 -9.8JUL 30.3% -750 13.0% 93 -656 -10.7 JUL 30.3% -1004 13.0% 194 -810 -13.2AUG 24.6% -608 15.0% 108 -500 -8.1 AUG 24.6% -815 15.0% 224 -591 -9.6SEP 10.8% -268 13.0% 93 -175 -2.9 SEP 10.8% -359 13.0% 194 -165 -2.8OCT 0.7% -16 10.0% 72 56 0.9 OCT 0.7% -22 10.0% 149 128 2.1NOV 0.0% 0 7.0% 50 50 0.8 NOV 0.0% 0 7.0% 105 105 1.8DEC 0.0% 0 6.0% 43 43 0.7 DEC 0.0% 0 6.0% 90 90 1.5

0Total = 100.0% -2476 100.0% 718 -1758 Total = 100.0% -3318 100.0% 1493 -1825

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-61

Upper Clark Fork (UCF)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 5.0% 25 25 0.4 JAN 0.0% 0 5.0% 52 52 0.8FEB 0.0% 0 4.0% 20 20 0.4 FEB 0.0% 0 4.0% 41 41 0.7MAR 0.0% 0 4.0% 20 20 0.3 MAR 0.0% 0 4.0% 41 41 0.7APR 0.0% 0 4.0% 20 20 0.3 APR 0.0% 0 4.0% 41 41 0.7MAY 2.7% -47 9.0% 45 -2 0.0 MAY 2.7% -63 9.0% 93 31 0.5JUN 27.5% -471 10.0% 50 -421 -7.1 JUN 27.5% -631 10.0% 103 -528 -8.9JUL 35.8% -614 13.0% 65 -549 -8.9 JUL 35.8% -822 13.0% 134 -688 -11.2AUG 30.2% -518 15.0% 75 -443 -7.2 AUG 30.2% -694 15.0% 155 -539 -8.8SEP 3.8% -65 13.0% 65 -1 0.0 SEP 3.8% -88 13.0% 134 47 0.8OCT 0.0% 0 10.0% 50 50 0.8 OCT 0.0% 0 10.0% 103 103 1.7NOV 0.0% 0 7.0% 35 35 0.6 NOV 0.0% 0 7.0% 72 72 1.2DEC 0.0% 0 6.0% 30 30 0.5 DEC 0.0% 0 6.0% 62 62 1.0

0Total = 100.0% -1714 100.0% 497 -1217 Total = 100.0% -2297 100.0% 1034 -1263

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Lower Clark Fork (LCF)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 2.0% 14 14 0.2 JAN 0.0% 0 2.0% 30 30 0.5FEB 0.0% 0 1.0% 7 7 0.1 FEB 0.0% 0 1.0% 15 15 0.3MAR 0.0% 0 0.0% 0 0 0.0 MAR 0.0% 0 0.0% 0 0 0.0APR 0.2% -5 0.0% 0 -5 -0.1 APR 0.2% -7 0.0% 0 -7 -0.1MAY 9.1% -219 6.0% 41 -179 -2.9 MAY 9.1% -298 6.0% 89 -209 -3.4JUN 22.7% -548 15.0% 101 -446 -7.5 JUN 22.7% -745 15.0% 222 -523 -8.8JUL 31.7% -765 18.0% 122 -644 -10.5 JUL 31.7% -1041 18.0% 266 -775 -12.6AUG 25.8% -623 20.0% 135 -488 -7.9 AUG 25.8% -847 20.0% 295 -551 -9.0SEP 10.3% -249 16.0% 108 -141 -2.4 SEP 10.3% -338 16.0% 236 -102 -1.7OCT 0.2% -6 11.0% 74 69 1.1 OCT 0.2% -8 11.0% 163 155 2.5NOV 0.0% 0 7.0% 47 47 0.8 NOV 0.0% 0 7.0% 103 103 1.7DEC 0.0% 0 4.0% 27 27 0.4 DEC 0.0% 0 4.0% 59 59 1.0

0Total = 100.0% -2414 100.0% 676 -1738 Total = 100.0% -3283 100.0% 1477 -1806

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Pend Oreille Basin in USA (PEN)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 8.0% 33 33 0.5 JAN 0.0% 0 8.0% 101 101 1.6FEB 0.0% 0 6.0% 25 25 0.5 FEB 0.0% 0 6.0% 76 76 1.4MAR 0.0% 0 6.0% 25 25 0.4 MAR 0.0% 0 6.0% 76 76 1.2APR 0.0% 0 6.0% 25 25 0.4 APR 0.0% 0 6.0% 76 76 1.3MAY 7.6% -144 6.0% 25 -119 -1.9 MAY 7.6% -213 6.0% 76 -138 -2.2JUN 23.4% -442 7.0% 29 -413 -6.9 JUN 23.4% -655 7.0% 88 -566 -9.5JUL 32.6% -617 10.0% 42 -576 -9.4 JUL 32.6% -914 10.0% 126 -788 -12.8AUG 26.8% -508 11.0% 46 -462 -7.5 AUG 26.8% -751 11.0% 139 -613 -10.0SEP 9.6% -182 11.0% 46 -136 -2.3 SEP 9.6% -269 11.0% 139 -131 -2.2OCT 0.0% 0 11.0% 46 46 0.7 OCT 0.0% 0 11.0% 139 139 2.3NOV 0.0% 0 10.0% 42 42 0.7 NOV 0.0% 0 10.0% 126 126 2.1DEC 0.0% 0 8.0% 33 33 0.5 DEC 0.0% 0 8.0% 101 101 1.6

0Total = 100.0% -1893 100.0% 417 -1477 Total = 100.0% -2802 100.0% 1261 -1541

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-62

Pend Oreille Basin in Canada (POC)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 8.0% 37 37 0.6 JAN 8.0% 112 112 1.8FEB 6.0% 28 28 0.5 FEB 6.0% 84 84 1.5MAR 6.0% 28 28 0.5 MAR 6.0% 84 84 1.4APR 6.0% 28 28 0.5 APR 6.0% 84 84 1.4MAY 13.1% -275 6.0% 28 -247 -4.0 MAY 13.1% -406 6.0% 84 -323 -5.2JUN 20.5% -430 7.0% 32 -397 -6.7 JUN 20.5% -636 7.0% 98 -538 -9.0JUL 28.3% -593 10.0% 46 -547 -8.9 JUL 28.3% -878 10.0% 140 -738 -12.0AUG 25.7% -539 11.0% 51 -488 -7.9 AUG 25.7% -797 11.0% 154 -644 -10.5SEP 12.3% -258 11.0% 51 -207 -3.5 SEP 12.3% -382 11.0% 154 -228 -3.8OCT 0.1% -2 11.0% 51 49 0.8 OCT 0.1% -3 11.0% 154 150 2.4NOV 10.0% 46 46 0.8 NOV 10.0% 140 140 2.3DEC 8.0% 37 37 0.6 DEC 8.0% 112 112 1.8

0.0 0.0Total = 100.0% -2096 100.0% 461 -1635 Total = 100.0% -3103 100.0% 1396 -1706

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Spokane (SPV)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 14 14 0.2 JAN 0.0% 0 4.0% 78 78 1.3FEB 0.0% 0 4.0% 14 14 0.3 FEB 0.0% 0 4.0% 78 78 1.4MAR 0.0% 0 3.0% 10 10 0.2 MAR 0.0% 0 3.0% 59 59 1.0APR 0.2% -4 4.0% 14 10 0.2 APR 0.2% -7 4.0% 78 71 1.2MAY 12.6% -274 11.0% 38 -236 -3.8 MAY 12.6% -494 11.0% 215 -279 -4.5JUN 26.0% -566 14.0% 49 -517 -8.7 JUN 26.0% -1018 14.0% 274 -744 -12.5JUL 31.1% -674 15.0% 52 -622 -10.1 JUL 31.1% -1214 15.0% 293 -921 -15.0AUG 20.0% -434 14.0% 49 -386 -6.3 AUG 20.0% -782 14.0% 274 -508 -8.3SEP 9.2% -200 12.0% 42 -159 -2.7 SEP 9.2% -360 12.0% 235 -126 -2.1OCT 0.9% -19 9.0% 31 12 0.2 OCT 0.9% -34 9.0% 176 142 2.3NOV 0.0% 0 5.0% 17 17 0.3 NOV 0.0% 0 5.0% 98 98 1.6DEC 0.0% 0 5.0% 17 17 0.3 DEC 0.0% 0 5.0% 98 98 1.6

0Total = 100.0% -2172 100.0% 347 -1824 Total = 100.0% -3909 100.0% 1955 -1955

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Page D-63

D.6.3 Mid-Columbia Basin Okanagan (OKA)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 6.0% 48 48 0.8 JAN 6.0% 83 83 1.3FEB 5.0% 40 40 0.7 FEB 5.0% 69 69 1.2MAR 4.0% 32 32 0.5 MAR 4.0% 55 55 0.9APR 4.0% 32 32 0.5 APR 4.0% 55 55 0.9MAY 12.3% -298 7.0% 56 -242 -3.9 MAY 12.3% -376 7.0% 96 -280 -4.5JUN 20.5% -497 9.0% 72 -425 -7.1 JUN 20.5% -627 9.0% 124 -503 -8.5JUL 28.4% -689 11.0% 88 -601 -9.8 JUL 28.4% -868 11.0% 151 -717 -11.7AUG 25.2% -611 13.0% 104 -507 -8.3 AUG 25.2% -770 13.0% 179 -592 -9.6SEP 11.6% -281 14.0% 112 -169 -2.8 SEP 11.6% -355 14.0% 193 -162 -2.7OCT 1.1% -25 11.0% 88 63 1.0 OCT 1.1% -34 11.0% 151 118 1.9NOV 9.0% 72 72 1.2 NOV 9.0% 124 124 2.1DEC 7.0% 56 56 0.9 DEC 7.0% 96 96 1.6

0.0 0.0Total = 100.0% -2426 100.0% 801 -1626 Total = 100.0% -3057 100.0% 1376 -1682

RETURN FLOW DEPLETIONDEPLETION DIVERSIONDIVERSION RETURN FLOW

Methow-Okanogan (OKM)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 54 54 0.9 JAN 0.0% 0 4.0% 71 71 1.2FEB 0.0% 0 4.0% 54 54 1.0 FEB 0.0% 0 4.0% 71 71 1.3MAR 0.0% 0 3.0% 41 41 0.7 MAR 0.0% 0 3.0% 53 53 0.9APR 0.2% -6 4.0% 54 49 0.8 APR 0.2% -6 4.0% 71 65 1.1MAY 12.4% -432 11.0% 149 -283 -4.6 MAY 12.4% -492 11.0% 196 -296 -4.8JUN 19.8% -686 14.0% 190 -496 -8.3 JUN 19.8% -782 14.0% 249 -533 -9.0JUL 27.4% -953 15.0% 203 -750 -12.2 JUL 27.4% -1086 15.0% 267 -819 -13.3AUG 24.5% -852 14.0% 190 -663 -10.8 AUG 24.5% -972 14.0% 249 -722 -11.7SEP 13.8% -480 12.0% 163 -317 -5.3 SEP 13.8% -547 12.0% 214 -333 -5.6OCT 1.9% -65 9.0% 122 57 0.9 OCT 1.9% -74 9.0% 160 87 1.4NOV 0.0% 0 5.0% 68 68 1.1 NOV 0.0% 0 5.0% 89 89 1.5DEC 0.0% 0 5.0% 68 68 1.1 DEC 0.0% 0 5.0% 89 89 1.4

0Total = 100.0% -3473 100.0% 1354 -2118 Total = 100.0% -3959 100.0% 1782 -2177

RETURN FLOW DEPLETIONDEPLETION DIVERSIONDIVERSION RETURN FLOW

Kettle (KET)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 6.0% 52 52 0.8 JAN 6.0% 90 90 1.5FEB 5.0% 43 43 0.8 FEB 5.0% 75 75 1.3MAR 4.0% 35 35 0.6 MAR 4.0% 60 60 1.0APR 4.0% 35 35 0.6 APR 4.0% 60 60 1.0MAY 14.2% -374 7.0% 61 -313 -5.1 MAY 14.2% -471 7.0% 104 -366 -6.0JUN 25.5% -671 9.0% 78 -593 -10.0 JUN 25.5% -845 9.0% 134 -711 -11.9JUL 28.9% -760 11.0% 96 -665 -10.8 JUL 28.9% -958 11.0% 164 -794 -12.9AUG 20.6% -542 13.0% 113 -429 -7.0 AUG 20.6% -683 13.0% 194 -489 -8.0SEP 10.0% -263 14.0% 122 -142 -2.4 SEP 10.0% -331 14.0% 209 -123 -2.1OCT 0.8% -21 11.0% 96 74 1.2 OCT 0.8% -27 11.0% 164 138 2.2NOV 9.0% 78 78 1.3 NOV 9.0% 134 134 2.3DEC 7.0% 61 61 1.0 DEC 7.0% 104 104 1.7

0.0 0.0Total = 100.0% -2631 100.0% 868 -1763 Total = 100.0% -3315 100.0% 1492 -1823

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-64

Ferry-Stevens (FER)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 13 13 0.2 JAN 0.0% 0 4.0% 75 75 1.2FEB 0.0% 0 4.0% 13 13 0.2 FEB 0.0% 0 4.0% 75 75 1.3MAR 0.0% 0 3.0% 10 10 0.2 MAR 0.0% 0 3.0% 56 56 0.9APR 0.3% -7 4.0% 13 6 0.1 APR 0.3% -12 4.0% 75 62 1.0MAY 13.5% -280 11.0% 36 -244 -4.0 MAY 13.5% -504 11.0% 205 -299 -4.9JUN 23.3% -483 14.0% 46 -436 -7.3 JUN 23.3% -869 14.0% 261 -608 -10.2JUL 29.1% -603 15.0% 50 -553 -9.0 JUL 29.1% -1086 15.0% 280 -806 -13.1AUG 23.6% -488 14.0% 46 -442 -7.2 AUG 23.6% -879 14.0% 261 -618 -10.0SEP 10.0% -207 12.0% 40 -167 -2.8 SEP 10.0% -373 12.0% 224 -149 -2.5OCT 0.2% -4 9.0% 30 26 0.4 OCT 0.2% -8 9.0% 168 160 2.6NOV 0.0% 0 5.0% 17 17 0.3 NOV 0.0% 0 5.0% 93 93 1.6DEC 0.0% 0 5.0% 17 17 0.3 DEC 0.0% 0 5.0% 93 93 1.5

0 0.0% 0.0%Total = 100.0% -2073 100.0% 332 -1741 Total = 100.0% -3731 100.0% 1866 -1866

DIVERSION RETURN FLOW RETURN FLOW DEPLETIONDEPLETION DIVERSION

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 74 74 1.2 JAN 0.0% 0 4.0% 90 90 1.5FEB 0.0% 0 4.0% 74 74 1.3 FEB 0.0% 0 4.0% 90 90 1.6MAR 0.0% 0 3.0% 56 56 0.9 MAR 0.0% 0 3.0% 67 67 1.1APR 3.3% -148 4.0% 74 -74 -1.2 APR 3.3% -163 4.0% 90 -73 -1.2MAY 13.7% -619 11.0% 204 -414 -6.7 MAY 13.7% -680 11.0% 247 -434 -7.1JUN 20.5% -926 14.0% 260 -666 -11.2 JUN 20.5% -1019 14.0% 314 -705 -11.8JUL 25.6% -1159 15.0% 278 -881 -14.3 JUL 25.6% -1275 15.0% 336 -939 -15.3AUG 21.7% -981 14.0% 260 -721 -11.7 AUG 21.7% -1079 14.0% 314 -765 -12.4SEP 12.0% -543 12.0% 223 -320 -5.4 SEP 12.0% -597 12.0% 269 -328 -5.5OCT 3.4% -152 9.0% 167 15 0.2 OCT 3.4% -167 9.0% 202 35 0.6NOV 0.0% 0 5.0% 93 93 1.6 NOV 0.0% 0 5.0% 112 112 1.9DEC 0.0% 0 5.0% 93 93 1.5 DEC 0.0% 0 5.0% 112 112 1.8

0Total = 100.0% -4527 100.0% 1856 -2671 Total = 100.0% -4980 100.0% 2241 -2739

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-65

D.6.4 Lower Snake Basin Upper Salmon (UPS)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 5.0% 43 43 0.7 JAN 0.0% 0 5.0% 89 89 1.5FEB 0.0% 0 5.0% 43 43 0.8 FEB 0.0% 0 5.0% 89 89 1.6MAR 0.0% 0 4.0% 34 34 0.6 MAR 0.0% 0 4.0% 72 72 1.2APR 1.2% -36 8.0% 69 33 0.6 APR 1.2% -48 8.0% 143 95 1.6MAY 13.5% -401 9.0% 77 -323 -5.3 MAY 13.5% -537 9.0% 161 -376 -6.1JUN 20.6% -613 11.0% 95 -518 -8.7 JUN 20.6% -821 11.0% 197 -624 -10.5JUL 28.0% -831 12.0% 103 -728 -11.8 JUL 28.0% -1114 12.0% 215 -899 -14.6AUG 23.8% -707 13.0% 112 -595 -9.7 AUG 23.8% -947 13.0% 233 -714 -11.6SEP 11.9% -354 12.0% 103 -251 -4.2 SEP 11.9% -475 12.0% 215 -260 -4.4OCT 0.9% -27 9.0% 77 51 0.8 OCT 0.9% -36 9.0% 161 126 2.0NOV 0.0% 0 6.0% 52 52 0.9 NOV 0.0% 0 6.0% 107 107 1.8DEC 0.0% 0 6.0% 52 52 0.8 DEC 0.0% 0 6.0% 107 107 1.7

0Total = 100.0% -2968 100.0% 861 -2107 Total = 100.0% -3978 100.0% 1790 -2188

DIVERSION RETURN FLOW RETURN FLOW DEPLETIONDEPLETION DIVERSION

Lower Salmon (LWS)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 5.0% 53 53 0.9 JAN 0.0% 0 5.0% 105 105 1.7FEB 0.0% 0 5.0% 53 53 1.0 FEB 0.0% 0 5.0% 105 105 1.9MAR 0.0% 0 4.0% 43 43 0.7 MAR 0.0% 0 4.0% 84 84 1.4APR 5.3% -187 8.0% 85 -102 -1.7 APR 5.3% -247 8.0% 169 -79 -1.3MAY 11.4% -406 9.0% 96 -310 -5.0 MAY 11.4% -536 9.0% 190 -346 -5.6JUN 17.9% -633 11.0% 117 -516 -8.7 JUN 17.9% -836 11.0% 232 -604 -10.1JUL 25.1% -890 12.0% 128 -762 -12.4 JUL 25.1% -1174 12.0% 253 -922 -15.0AUG 23.1% -820 13.0% 138 -682 -11.1 AUG 23.1% -1083 13.0% 274 -809 -13.2SEP 12.6% -448 12.0% 128 -320 -5.4 SEP 12.6% -591 12.0% 253 -338 -5.7OCT 4.6% -162 9.0% 96 -67 -1.1 OCT 4.6% -214 9.0% 190 -25 -0.4NOV 0.0% 0 6.0% 64 64 1.1 NOV 0.0% 0 6.0% 126 126 2.1DEC 0.0% 0 6.0% 64 64 1.0 DEC 0.0% 0 6.0% 126 126 2.1

0Total = 100.0% -3547 100.0% 1064 -2483 Total = 100.0% -4682 100.0% 2107 -2575

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Grande Ronde at Wenaha (WEN)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 8.0% 16 16 0.3 JAN 0.0% 0 8.0% 157 157 2.6FEB 0.0% 0 8.0% 16 16 0.3 FEB 0.0% 0 8.0% 157 157 2.8MAR 0.0% 0 6.0% 12 12 0.2 MAR 0.0% 0 6.0% 118 118 1.9APR 0.4% -7 6.0% 12 5 0.1 APR 0.4% -14 6.0% 118 104 1.7MAY 13.2% -271 6.0% 12 -259 -4.2 MAY 13.2% -518 6.0% 118 -400 -6.5JUN 25.7% -527 6.0% 12 -514 -8.6 JUN 25.7% -1007 6.0% 118 -889 -14.9JUL 30.0% -615 7.0% 14 -601 -9.8 JUL 30.0% -1176 7.0% 137 -1038 -16.9AUG 19.6% -403 10.0% 21 -383 -6.2 AUG 19.6% -770 10.0% 196 -574 -9.3SEP 10.6% -217 11.0% 23 -194 -3.3 SEP 10.6% -415 11.0% 216 -199 -3.3OCT 0.6% -13 11.0% 23 10 0.2 OCT 0.6% -25 11.0% 216 191 3.1NOV 0.0% 0 11.0% 23 23 0.4 NOV 0.0% 0 11.0% 216 216 3.6DEC 0.0% 0 10.0% 21 21 0.3 DEC 0.0% 0 10.0% 196 196 3.2

0Total = 100.0% -2053 100.0% 205 -1848 Total = 100.0% -3924 100.0% 1962 -1962

DEPLETION DIVERSION RETURN FLOW DEPLETIONDIVERSION RETURN FLOW

Page D-66

Clearwater (CLR)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 8.0% 42 42 0.7 JAN 0.0% 0 8.0% 145 145 2.4FEB 0.0% 0 8.0% 42 42 0.8 FEB 0.0% 0 8.0% 145 145 2.6MAR 0.0% 0 6.0% 32 32 0.5 MAR 0.0% 0 6.0% 109 109 1.8APR 3.4% -89 6.0% 32 -57 -1.0 APR 3.4% -135 6.0% 109 -27 -0.4MAY 11.1% -295 6.0% 32 -263 -4.3 MAY 11.1% -448 6.0% 109 -339 -5.5JUN 19.1% -505 6.0% 32 -473 -7.9 JUN 19.1% -767 6.0% 109 -659 -11.1JUL 26.6% -704 7.0% 37 -667 -10.8 JUL 26.6% -1070 7.0% 127 -943 -15.3AUG 24.7% -653 10.0% 53 -600 -9.8 AUG 24.7% -993 10.0% 181 -811 -13.2SEP 12.9% -341 11.0% 58 -282 -4.7 SEP 12.9% -518 11.0% 199 -319 -5.4OCT 2.3% -62 11.0% 58 -4 -0.1 OCT 2.3% -94 11.0% 199 105 1.7NOV 0.0% 0 11.0% 58 58 1.0 NOV 0.0% 0 11.0% 199 199 3.3DEC 0.0% 0 10.0% 53 53 0.9 DEC 0.0% 0 10.0% 181 181 2.9

0Total = 100.0% -2648 100.0% 530 -2118 Total = 100.0% -4024 100.0% 1811 -2213

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Palouse-Lower Snake (PLS)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 7.0% 38 38 0.6 JAN 0.0% 0 7.0% 131 131 2.1FEB 0.0% 0 6.0% 33 33 0.6 FEB 0.0% 0 6.0% 112 112 2.0MAR 0.0% 0 5.0% 27 27 0.4 MAR 0.0% 0 5.0% 94 94 1.5APR 2.7% -73 7.0% 38 -34 -0.6 APR 2.7% -111 7.0% 131 20 0.3MAY 12.2% -334 9.0% 49 -284 -4.6 MAY 12.2% -507 9.0% 169 -338 -5.5JUN 22.0% -602 11.0% 60 -542 -9.1 JUN 22.0% -915 11.0% 206 -709 -11.9JUL 26.4% -722 11.0% 60 -662 -10.8 JUL 26.4% -1097 11.0% 206 -892 -14.5AUG 22.2% -607 11.0% 60 -547 -8.9 AUG 22.2% -923 11.0% 206 -717 -11.7SEP 11.9% -324 11.0% 60 -264 -4.4 SEP 11.9% -493 11.0% 206 -287 -4.8OCT 2.8% -76 8.0% 44 -32 -0.5 OCT 2.8% -115 8.0% 150 35 0.6NOV 0.0% 0 7.0% 38 38 0.6 NOV 0.0% 0 7.0% 131 131 2.2DEC 0.0% 0 7.0% 38 38 0.6 DEC 0.0% 0 7.0% 131 131 2.1

0Total = 100.0% -2738 100.0% 548 -2190 Total = 100.0% -4161 100.0% 1872 -2289

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Page D-67

D.6.5 Lower Columbia Basin Walla Walla (WWA)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 7.0% 23 23 0.4 JAN 0.0% 0 7.0% 102 102 1.7FEB 0.0% 0 6.0% 20 20 0.4 FEB 0.0% 0 6.0% 88 88 1.6MAR 0.0% 0 5.0% 16 16 0.3 MAR 0.0% 0 5.0% 73 73 1.2APR 3.7% -76 7.0% 23 -53 -0.9 APR 3.7% -121 7.0% 102 -19 -0.3MAY 16.0% -325 9.0% 29 -296 -4.8 MAY 16.0% -520 9.0% 132 -388 -6.3JUN 26.4% -537 11.0% 36 -501 -8.4 JUN 26.4% -859 11.0% 161 -698 -11.7JUL 26.0% -528 11.0% 36 -492 -8.0 JUL 26.0% -845 11.0% 161 -684 -11.1AUG 20.2% -410 11.0% 36 -374 -6.1 AUG 20.2% -656 11.0% 161 -495 -8.1SEP 7.5% -153 11.0% 36 -117 -2.0 SEP 7.5% -244 11.0% 161 -83 -1.4OCT 0.2% -4 8.0% 26 22 0.4 OCT 0.2% -7 8.0% 117 110 1.8NOV 0.0% 0 7.0% 23 23 0.4 NOV 0.0% 0 7.0% 102 102 1.7DEC 0.0% 0 7.0% 23 23 0.4 DEC 0.0% 0 7.0% 102 102 1.7

0Total = 100.0% -2032 100.0% 325 -1707 Total = 100.0% -3252 100.0% 1463 -1789

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Pumping from McNary to Northside (NSM)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 0 0.0 JAN 0.0% 0 0 0.0FEB 0.0% 0 0 0.0 FEB 0.0% 0 0 0.0MAR 0.0% -1 -1 0.0 MAR 0.0% -1 -1 0.0APR 3.9% -116 -116 -2.0 APR 3.9% -175 -175 -2.9MAY 13.3% -398 -398 -6.5 MAY 13.3% -597 -597 -9.7JUN 20.2% -606 -606 -10.2 JUN 20.2% -909 -909 -15.3JUL 24.1% -722 -722 -11.7 JUL 24.1% -1082 -1082 -17.6AUG 21.6% -647 -647 -10.5 AUG 21.6% -970 -970 -15.8SEP 12.6% -377 -377 -6.3 SEP 12.6% -565 -565 -9.5OCT 4.3% -128 -128 -2.1 OCT 4.3% -191 -191 -3.1NOV 0.0% 0 0 0.0 NOV 0.0% 0 0 0.0DEC 0.0% 0 0 0.0 DEC 0.0% 0 0 0.0

Total = 100.0% -2993 -2993 Total = 100.0% -4490 -4490

RETURN FLOW DIVERSION DIVERSION DIVERSION DIVERSION RETURN FLOW

Return flow from MCN pumping to Northside (NSR)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 3.0% 18 18 0.3 JAN 3.0% 61 61 1.0FEB 3.0% 18 18 0.3 FEB 3.0% 61 61 1.1MAR 3.0% 18 18 0.3 MAR 3.0% 61 61 1.0APR 3.0% 18 18 0.3 APR 3.0% 61 61 1.0MAY 9.0% 54 54 0.9 MAY 9.0% 182 182 3.0JUN 12.0% 72 72 1.2 JUN 12.0% 242 242 4.1JUL 12.0% 72 72 1.2 JUL 12.0% 242 242 3.9AUG 15.0% 90 90 1.5 AUG 15.0% 303 303 4.9SEP 13.0% 78 78 1.3 SEP 13.0% 263 263 4.4OCT 12.0% 72 72 1.2 OCT 12.0% 242 242 3.9NOV 9.0% 54 54 0.9 NOV 9.0% 182 182 3.1DEC 6.0% 36 36 0.6 DEC 6.0% 121 121 2.0

0Total = 100.0% 599 599 Total = 100.0% 2021 2021

DIVERSION RETURN FLOW RETURN FLOW RETURN FLOWRETURN FLOW DIVERSION

Page D-68

Pumping From McNary to Umatilla (UMP)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 0 0.0 JAN 0.0% 0 0 0.0FEB 0.0% 0 0 0.0 FEB 0.0% 0 0 0.0MAR 0.0% 0 0 0.0 MAR 0.0% 0 0 0.0APR 1.7% -36 -36 -0.6 APR 1.7% -55 -55 -0.9MAY 11.7% -252 -252 -4.1 MAY 11.7% -377 -377 -6.1JUN 24.3% -521 -521 -8.8 JUN 24.3% -782 -782 -13.1JUL 30.1% -646 -646 -10.5 JUL 30.1% -969 -969 -15.8AUG 22.8% -489 -489 -7.9 AUG 22.8% -733 -733 -11.9SEP 9.0% -193 -193 -3.2 SEP 9.0% -290 -290 -4.9OCT 0.3% -7 -7 -0.1 OCT 0.3% -11 -11 -0.2NOV 0.0% 0 0 0.0 NOV 0.0% 0 0 0.0DEC 0.0% 0 0 0.0 DEC 0.0% 0 0 0.0

Total = 100.0% -2144 -2144 Total = 100.0% -3217 -3217

RETURN FLOW DIVERSION DIVERSION RETURN FLOW DIVERSION DIVERSION

Return flow from MCN pumping to Umatilla (UMR)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 3.0% 13 13 0.2 JAN 3.0% 43 43 0.7FEB 3.0% 13 13 0.2 FEB 3.0% 43 43 0.8MAR 3.0% 13 13 0.2 MAR 3.0% 43 43 0.7APR 3.0% 13 13 0.2 APR 3.0% 43 43 0.7MAY 9.0% 39 39 0.6 MAY 9.0% 130 130 2.1JUN 12.0% 51 51 0.9 JUN 12.0% 174 174 2.9JUL 12.0% 51 51 0.8 JUL 12.0% 174 174 2.8AUG 15.0% 64 64 1.0 AUG 15.0% 217 217 3.5SEP 13.0% 56 56 0.9 SEP 13.0% 188 188 3.2OCT 12.0% 51 51 0.8 OCT 12.0% 174 174 2.8NOV 9.0% 39 39 0.6 NOV 9.0% 130 130 2.2DEC 6.0% 26 26 0.4 DEC 6.0% 87 87 1.4

Total = 100.0% 429 429 Total = 1447 1447

DIVERSION RETURN FLOW RETURN FLOW DIVERSION RETURN FLOW RETURN FLOW

Umatilla River & Willow Creek (UMW)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 4 4 0.1 JAN 0.0% 0 4.0% 71 71 1.2FEB 0.0% 0 3.0% 3 3 0.1 FEB 0.0% 0 3.0% 54 54 1.0MAR 0.0% 0 2.0% 2 2 0.0 MAR 0.0% 0 2.0% 36 36 0.6APR 1.7% -30 3.0% 3 -27 -0.5 APR 1.7% -61 3.0% 54 -7 -0.1MAY 11.7% -210 8.0% 9 -201 -3.3 MAY 11.7% -419 8.0% 143 -276 -4.5JUN 24.3% -434 12.0% 13 -422 -7.1 JUN 24.3% -869 12.0% 214 -654 -11.0JUL 30.1% -538 13.0% 14 -525 -8.5 JUL 30.1% -1077 13.0% 232 -845 -13.7AUG 22.8% -407 14.0% 15 -392 -6.4 AUG 22.8% -814 14.0% 250 -564 -9.2SEP 9.0% -161 13.0% 14 -147 -2.5 SEP 9.0% -322 13.0% 232 -90 -1.5OCT 0.3% -6 12.0% 13 7 0.1 OCT 0.3% -12 12.0% 214 203 3.3NOV 0.0% 0 10.0% 11 11 0.2 NOV 0.0% 0 10.0% 179 179 3.0DEC 0.0% 0 6.0% 6 6 0.1 DEC 0.0% 0 6.0% 107 107 1.7

0Total = 100.0% -1787 100.0% 107 -1680 Total = 100.0% -3574 100.0% 1787 -1787

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-69

Pumping from John Day to Northside + Returns (NSJ)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 18 18 0.3 JAN 0.0% 0 3.0% 61 61 1.0FEB 0.0% 0 3.0% 18 18 0.3 FEB 0.0% 0 3.0% 61 61 1.1MAR 0.0% -1 3.0% 18 17 0.3 MAR 0.0% -1 3.0% 61 60 1.0APR 3.9% -116 3.0% 18 -98 -1.7 APR 3.9% -175 3.0% 61 -114 -1.9MAY 13.3% -398 9.0% 54 -344 -5.6 MAY 13.3% -597 9.0% 182 -416 -6.8JUN 20.2% -606 12.0% 72 -534 -9.0 JUN 20.2% -909 12.0% 242 -666 -11.2JUL 24.1% -722 12.0% 72 -650 -10.6 JUL 24.1% -1082 12.0% 242 -840 -13.7AUG 21.6% -647 15.0% 90 -557 -9.1 AUG 21.6% -970 15.0% 303 -667 -10.8SEP 12.6% -377 13.0% 78 -299 -5.0 SEP 12.6% -565 13.0% 263 -302 -5.1OCT 4.3% -128 12.0% 72 -56 -0.9 OCT 4.3% -191 12.0% 242 51 0.8NOV 0.0% 0 9.0% 54 54 0.9 NOV 0.0% 0 9.0% 182 182 3.1DEC 0.0% 0 6.0% 36 36 0.6 DEC 0.0% 0 6.0% 121 121 2.0

Total = 100.0% -2993 100.0% 599 -2395 Total = 100.0% -4490 100.0% 2021 -2470

DEPLETION DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW

Pumping from John Day to Morrow & Gilliam Counties (JDP)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 13 13 0.2 JAN 0.0% 0 3.0% 43 43 0.7FEB 0.0% 0 3.0% 13 13 0.2 FEB 0.0% 0 3.0% 43 43 0.8MAR 0.0% 0 3.0% 13 13 0.2 MAR 0.0% 0 3.0% 43 43 0.7APR 1.7% -36 3.0% 13 -24 -0.4 APR 1.7% -55 3.0% 43 -11 -0.2MAY 11.7% -252 9.0% 39 -213 -3.5 MAY 11.7% -377 9.0% 130 -247 -4.0JUN 24.3% -521 12.0% 51 -470 -7.9 JUN 24.3% -782 12.0% 174 -608 -10.2JUL 30.1% -646 12.0% 51 -595 -9.7 JUL 30.1% -969 12.0% 174 -796 -12.9AUG 22.8% -489 15.0% 64 -424 -6.9 AUG 22.8% -733 15.0% 217 -516 -8.4SEP 9.0% -193 13.0% 56 -137 -2.3 SEP 9.0% -290 13.0% 188 -102 -1.7OCT 0.3% -7 12.0% 51 44 0.7 OCT 0.3% -11 12.0% 174 163 2.7NOV 0.0% 0 9.0% 39 39 0.6 NOV 0.0% 0 9.0% 130 130 2.2DEC 0.0% 0 6.0% 26 26 0.4 DEC 0.0% 0 6.0% 87 87 1.4

Total = 100.0% -2144 100.0% 429 -1716 Total = 100.0% -3217 100.0% 1447 -1769

DEPLETION DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW

John Day (JDA)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 18 18 0.3 JAN 0.0% 0 4.0% 69 69 1.1FEB 0.0% 0 3.0% 13 13 0.2 FEB 0.0% 0 3.0% 52 52 0.9MAR 0.0% 0 2.0% 9 9 0.1 MAR 0.0% 0 2.0% 35 35 0.6APR 0.7% -17 3.0% 13 -3 -0.1 APR 0.7% -26 3.0% 52 26 0.4MAY 11.7% -288 8.0% 35 -252 -4.1 MAY 11.7% -449 8.0% 138 -311 -5.1JUN 20.6% -507 12.0% 53 -454 -7.6 JUN 20.6% -791 12.0% 207 -584 -9.8JUL 28.6% -704 13.0% 58 -646 -10.5 JUL 28.6% -1098 13.0% 224 -873 -14.2AUG 24.0% -591 14.0% 62 -529 -8.6 AUG 24.0% -922 14.0% 242 -681 -11.1SEP 13.1% -321 13.0% 58 -264 -4.4 SEP 13.1% -501 13.0% 224 -277 -4.6OCT 1.3% -32 12.0% 53 21 0.3 OCT 1.3% -50 12.0% 207 157 2.6NOV 0.0% 0 10.0% 44 44 0.7 NOV 0.0% 0 10.0% 173 173 2.9DEC 0.0% 0 6.0% 27 27 0.4 DEC 0.0% 0 6.0% 104 104 1.7

0Total = 100.0% -2459 100.0% 443 -2017 Total = 100.0% -3836 100.0% 1726 -2110

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-70

Deschutes - White River Wapanita (WHT)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 37 37 0.6 JAN 0.0% 0 3.0% 37 37 0.6FEB 0.0% 0 3.0% 37 37 0.7 FEB 0.0% 0 3.0% 37 37 0.7MAR 0.0% 0 3.0% 37 37 0.6 MAR 0.0% 0 3.0% 37 37 0.6APR 0.1% -4 3.0% 37 33 0.6 APR 0.1% -4 3.0% 37 33 0.6MAY 8.0% -247 9.0% 110 -136 -2.2 MAY 8.0% -247 9.0% 110 -136 -2.2JUN 24.0% -735 12.0% 147 -588 -9.9 JUN 24.0% -735 12.0% 147 -588 -9.9JUL 31.7% -973 12.0% 147 -826 -13.4 JUL 31.7% -973 12.0% 147 -826 -13.4AUG 25.3% -775 15.0% 184 -592 -9.6 AUG 25.3% -775 15.0% 184 -592 -9.6SEP 9.9% -303 13.0% 159 -144 -2.4 SEP 9.9% -303 13.0% 159 -144 -2.4OCT 0.9% -27 12.0% 147 120 1.9 OCT 0.9% -27 12.0% 147 120 1.9NOV 0.0% 0 9.0% 110 110 1.9 NOV 0.0% 0 9.0% 110 110 1.9DEC 0.0% 0 6.0% 74 74 1.2 DEC 0.0% 0 6.0% 74 74 1.2

Total = 100.0% -3064 100.0% 1226 -1838 Total = 100.0% -3064 100.0% 1226 -1838

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Klickitat (KLC)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 24 24 0.4 JAN 0.0% 0 3.0% 24 24 0.4FEB 0.0% 0 3.0% 24 24 0.4 FEB 0.0% 0 3.0% 24 24 0.4MAR 0.0% 0 3.0% 24 24 0.4 MAR 0.0% 0 3.0% 24 24 0.4APR 0.0% 0 3.0% 24 24 0.4 APR 0.0% 0 3.0% 24 24 0.4MAY 4.8% -94 9.0% 71 -23 -0.4 MAY 4.8% -94 9.0% 71 -23 -0.4JUN 18.9% -371 12.0% 94 -277 -4.6 JUN 18.9% -371 12.0% 94 -277 -4.6JUL 46.6% -916 12.0% 94 -822 -13.4 JUL 46.6% -916 12.0% 94 -822 -13.4AUG 26.7% -524 15.0% 118 -406 -6.6 AUG 26.7% -524 15.0% 118 -406 -6.6SEP 3.1% -62 13.0% 102 40 0.7 SEP 3.1% -62 13.0% 102 40 0.7OCT 0.0% 0 12.0% 94 94 1.5 OCT 0.0% 0 12.0% 94 94 1.5NOV 0.0% 0 9.0% 71 71 1.2 NOV 0.0% 0 9.0% 71 71 1.2DEC 0.0% 0 6.0% 47 47 0.8 DEC 0.0% 0 6.0% 47 47 0.8

Total = 100.0% -1968 100.0% 787 -1181 Total = 100.0% -1968 100.0% 787 -1181

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Hood River (HOD)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 8 8 0.1 JAN 0.0% 0 3.0% 65 65 1.1FEB 0.0% 0 3.0% 8 8 0.1 FEB 0.0% 0 3.0% 65 65 1.2MAR 0.0% 0 3.0% 8 8 0.1 MAR 0.0% 0 3.0% 65 65 1.1APR 2.1% -48 3.0% 8 -39 -0.7 APR 2.1% -89 3.0% 65 -24 -0.4MAY 15.4% -356 9.0% 25 -331 -5.4 MAY 15.4% -665 9.0% 194 -471 -7.7JUN 22.3% -515 12.0% 33 -482 -8.1 JUN 22.3% -961 12.0% 259 -702 -11.8JUL 25.9% -600 12.0% 33 -567 -9.2 JUL 25.9% -1120 12.0% 259 -861 -14.0AUG 21.4% -494 15.0% 42 -452 -7.4 AUG 21.4% -922 15.0% 324 -598 -9.7SEP 11.8% -273 13.0% 36 -237 -4.0 SEP 11.8% -509 13.0% 281 -228 -3.8OCT 1.2% -28 12.0% 33 5 0.1 OCT 1.2% -53 12.0% 259 207 3.4NOV 0.0% 0 9.0% 25 25 0.4 NOV 0.0% 0 9.0% 194 194 3.3DEC 0.0% 0 6.0% 17 17 0.3 DEC 0.0% 0 6.0% 130 130 2.1

0Total = 100.0% -2313 100.0% 278 -2036 Total = 100.0% -4318 100.0% 2159 -2159

DEPLETION DIVERSION RETURN FLOW DEPLETIONDIVERSION RETURN FLOW

Page D-71

White Salmon (WHS)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 3.0% 38 38 0.6 JAN 0.0% 0 3.0% 38 38 0.6FEB 0.0% 0 3.0% 38 38 0.7 FEB 0.0% 0 3.0% 38 38 0.7MAR 0.0% 0 3.0% 38 38 0.6 MAR 0.0% 0 3.0% 38 38 0.6APR 0.0% 0 3.0% 38 38 0.6 APR 0.0% 0 3.0% 38 38 0.6MAY 9.2% -288 9.0% 113 -175 -2.8 MAY 9.2% -288 9.0% 113 -175 -2.8JUN 23.5% -738 12.0% 151 -587 -9.9 JUN 23.5% -738 12.0% 151 -587 -9.9JUL 32.1% -1010 12.0% 151 -859 -14.0 JUL 32.1% -1010 12.0% 151 -859 -14.0AUG 25.4% -798 15.0% 189 -609 -9.9 AUG 25.4% -798 15.0% 189 -609 -9.9SEP 9.9% -311 13.0% 164 -147 -2.5 SEP 9.9% -311 13.0% 164 -147 -2.5OCT 0.0% 0 12.0% 151 151 2.5 OCT 0.0% 0 12.0% 151 151 2.5NOV 0.0% 0 9.0% 113 113 1.9 NOV 0.0% 0 9.0% 113 113 1.9DEC 0.0% 0 6.0% 75 75 1.2 DEC 0.0% 0 6.0% 75 75 1.2

0Total = 100.0% -3145 100.0% 1258 -1887 Total = 100.0% -3145 100.0% 1258 -1887

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-72

D.6.6 Willamette Basin Willamette (WMT)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 13 13 0.2 JAN 0.0% 0 4.0% 44 44 0.7FEB 0.0% 0 4.0% 13 13 0.2 FEB 0.0% 0 4.0% 44 44 0.8MAR 0.0% 0 4.0% 13 13 0.2 MAR 0.0% 0 4.0% 44 44 0.7APR 0.3% -5 4.0% 13 8 0.1 APR 0.3% -8 4.0% 44 36 0.6MAY 6.5% -105 5.0% 16 -89 -1.4 MAY 6.5% -160 5.0% 55 -104 -1.7JUN 16.8% -272 12.0% 39 -233 -3.9 JUN 16.8% -414 12.0% 133 -281 -4.7JUL 32.3% -524 17.0% 55 -469 -7.6 JUL 32.3% -797 17.0% 189 -609 -9.9AUG 30.2% -490 18.0% 58 -432 -7.0 AUG 30.2% -745 18.0% 200 -546 -8.9SEP 13.5% -218 13.0% 42 -176 -3.0 SEP 13.5% -332 13.0% 144 -187 -3.1OCT 0.3% -5 9.0% 29 24 0.4 OCT 0.3% -8 9.0% 100 92 1.5NOV 0.0% 0 6.0% 19 19 0.3 NOV 0.0% 0 6.0% 67 67 1.1DEC 0.0% 0 4.0% 13 13 0.2 DEC 0.0% 0 4.0% 44 44 0.7

0Total = 100.0% -1621 100.0% 324 -1297 Total = 100.0% -2464 100.0% 1109 -1355

RETURN FLOW DEPLETIONDIVERSION RETURN FLOW DEPLETION DIVERSION

Fern Ridge (FRN)Sprinkler System Gravity SystemMonth Month

% ac-ft per % ac-ft per ac-ft per cfs per % ac-ft per % ac-ft per ac-ft per cfs per1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac 1000 ac

JAN 0.0% 0 4.0% 18 18 0.3 JAN 0.0% 0 4.0% 61 61 1.0FEB 0.0% 0 4.0% 18 18 0.3 FEB 0.0% 0 4.0% 61 61 1.1MAR 0.0% 0 4.0% 18 18 0.3 MAR 0.0% 0 4.0% 61 61 1.0APR 0.9% -21 4.0% 18 -3 -0.1 APR 0.9% -32 4.0% 61 30 0.5MAY 9.2% -206 5.0% 22 -184 -3.0 MAY 9.2% -313 5.0% 77 -237 -3.8JUN 17.6% -394 12.0% 54 -340 -5.7 JUN 17.6% -599 12.0% 184 -415 -7.0JUL 27.8% -624 17.0% 76 -547 -8.9 JUL 27.8% -948 17.0% 261 -687 -11.2AUG 26.3% -590 18.0% 81 -509 -8.3 AUG 26.3% -897 18.0% 276 -621 -10.1SEP 15.7% -352 13.0% 58 -294 -4.9 SEP 15.7% -536 13.0% 200 -336 -5.6OCT 2.5% -56 9.0% 40 -16 -0.3 OCT 2.5% -86 9.0% 138 52 0.9NOV 0.0% 0 6.0% 27 27 0.5 NOV 0.0% 0 6.0% 92 92 1.5DEC 0.0% 0 4.0% 18 18 0.3 DEC 0.0% 0 4.0% 61 61 1.0

0Total = 100.0% -2244 100.0% 449 -1795 Total = 100.0% -3410 100.0% 1535 -1876

DIVERSION RETURN FLOW DEPLETION DIVERSION RETURN FLOW DEPLETION

Page D-73

D.7 Surface Water Irrigated Acreage

D.7.1 Upper Columbia and Kootenay Basins Upper Columbia above Mica (UPC)

Year Sprinkler Gravity Total1925 0.0 4.6 4.61928 0.0 4.7 4.71950 0.0 6.4 6.41966 3.5 5.1 8.61978 5.8 6.0 11.81988 10.0 4.0 14.01999 11.0 2.8 13.82008 4.9 1.3 6.2

Irrigated acres (1000s of acres)

Hugh Keenleyside (ARD)

Year Sprinkler Gravity Total1925 0.0 0.7 0.71928 0.0 0.7 0.71950 0.0 1.0 1.01966 0.6 0.7 1.31978 1.2 0.9 2.11988 4.1 0.5 4.61999 4.0 0.4 4.42008 2.0 0.2 2.2

Irrigated acres (1000s of acres)

East Kootenay (EKO)

Year Sprinkler Gravity Total1925 0.0 4.6 4.61928 0.0 4.7 4.71950 0.0 6.5 6.51966 4.6 8.1 12.71978 8.2 10.4 18.61988 20.0 6.6 26.61999 27.2 3.0 30.22008 13.4 1.5 14.9

Irrigated acres (1000s of acres)

West Kootenay (WKO)

Year Sprinkler Gravity Total1925 0.0 1.8 1.81928 0.0 1.8 1.81950 0.0 4.0 4.01966 2.7 3.6 6.31978 6.3 5.6 11.91988 10.5 4.0 14.51999 15.3 1.9 17.22008 5.1 0.6 5.7

Irrigated acres (1000s of acres)

Page D-74

Kootenai-Montana (KMT)

Year Sprinkler Gravity Total1925 0.0 6.8 6.81928 0.0 7.0 7.01950 0.0 7.0 7.01966 2.2 6.0 8.21978 5.9 5.4 11.31988 4.8 4.4 9.21999 2.4 6.5 8.92008 4.7 0.4 5.2

Irrigated acres (1000s of acres)

Kootenai-Idaho (KID)

Year Sprinkler Gravity Total1925 0.0 0.9 0.91928 0.0 1.0 1.01948 0.0 1.0 1.01965 0.8 0.6 1.41978 2.9 0.1 3.01988 2.3 0.0 2.31999 2.4 0.0 2.42008 0.6 0.9 1.5

Irrigated acres (1000s of acres)

Brilliant (BRI)

Year Sprinkler Gravity Total1925 0.0 0.5 0.51928 0.0 0.5 0.51950 0.0 0.9 0.91966 0.5 0.7 1.21978 2.0 1.8 3.81988 3.7 0.5 4.21999 3.6 0.4 4.02008 0.4 0.0 0.4

Irrigated acres (1000s of acres)

Columbia at Trail (CTR)

Year Sprinkler Gravity Total1925 0.0 0.3 0.31928 0.0 0.3 0.31950 0.0 0.5 0.51966 0.3 0.5 0.81978 0.5 0.4 0.91988 1.6 0.2 1.81999 1.6 0.1 1.72008 0.4 0.1 0.5

Irrigated acres (1000s of acres)

Page D-75

D.7.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

Year Sprinkler Gravity Total1925 0.0 6.2 6.21928 0.0 6.0 6.01950 0.0 8.5 8.51966 9.4 16.7 26.11978 21.9 13.4 35.31988 21.6 13.2 34.81999 27.4 9.2 36.62008 22.3 2.4 24.8

Irrigated acres (1000s of acres)

Flathead Irrigation District (FID)

Year Sprinkler Gravity Total1925 0.0 31.8 31.81928 0.0 33.8 33.81950 0.0 93.8 93.81966 30.6 86.3 116.91978 78.9 48.4 127.31988 71.9 44.1 116.01999 91.1 30.4 121.52008 74.1 25.4 99.6

Irrigated acres (1000s of acres)

Bitterroot (BIT)

Year Sprinkler Gravity Total1925 0.0 111.0 111.01928 0.0 108.0 108.01950 0.0 108.0 108.01966 36.0 70.0 106.01978 65.4 46.0 111.41988 55.3 39.0 94.31999 70.2 23.4 93.62008 56.2 29.2 85.4

Irrigated acres (1000s of acres)

Upper Clark Fork (UCF)

Year Sprinkler Gravity Total1925 0.0 125.8 125.81928 0.0 125.0 125.01950 0.0 128.0 128.01966 5.7 121.6 127.31978 32.4 94.9 127.31988 36.6 107.4 144.01999 77.9 63.7 141.62008 77.4 69.4 146.8

Irrigated acres (1000s of acres)

Page D-76

Lower Clark Fork (LCF)

Year Sprinkler Gravity Total1925 0.0 15.3 15.31928 0.0 15.5 15.51950 0.0 20.0 20.01966 8.0 19.0 27.01978 21.1 8.8 29.91988 13.5 5.6 19.11999 11.3 4.3 15.62008 10.3 3.8 14.1

Irrigated acres (1000s of acres)

Pend Oreille Basin in USA (PEN)

Year Sprinkler Gravity Total1925 0.0 3.5 3.51928 0.0 3.6 3.61950 0.0 5.3 5.31966 5.2 1.8 7.01978 8.2 0.0 8.21988 4.7 2.5 7.21999 4.0 0.0 4.02008 1.2 0.3 1.5

Irrigated acres (1000s of acres)

Pend Oreille Basin in Canada (POC)

Year Sprinkler Gravity Total1925 0.0 0.2 0.21928 0.0 0.2 0.21950 0.0 0.4 0.41966 0.3 0.3 0.61978 0.6 0.5 1.11988 0.6 0.3 0.91999 0.9 0.2 1.12008 0.9 0.2 1.1

Irrigated acres (1000s of acres)

*Spokane (SPV)

Year Sprinkler Gravity Total1928 0.0 24.6 24.61987 31.7 3.6 35.31992 32.3 4.1 36.41995 37.0 2.8 39.82000 25.6 3.1 28.72002 25.5 2.4 27.92005 26.5 2.9 29.42007 23.6 2.2 25.8

* Surface water + Groundwater

Irrigated acres (1000s of acres)

Page D-77

D.7.3 Mid-Columbia Basin Okanagan (OKA)

Year Sprinkler Gravity Total1925 0.0 84.0 84.01928 0.0 80.4 80.41950 0.0 93.0 93.01966 51.5 65.6 117.11978 72.2 61.5 133.71988 77.3 25.8 103.11999 120.2 4.7 124.92008 60.4 2.4 62.8

Irrigated acres (1000s of acres)

Methow-Okanogan (OKM)

Year Sprinkler Gravity Total1925 0.0 32.0 32.01928 0.0 31.3 31.31948 0.0 35.0 35.01966 16.0 18.5 34.51978 39.4 0.0 39.41988 42.9 0.9 43.81999 39.4 0.0 39.42008 30.7 0.3 31.0

Irrigated acres (1000s of acres)

Kettle (KET)

Year Sprinkler Gravity Total1925 0.0 4.5 4.51928 0.0 4.6 4.61950 0.0 5.8 5.81966 4.9 5.8 10.71978 11.8 9.3 21.11988 20.6 6.5 27.11999 23.0 3.9 26.92008 7.4 1.3 8.7

Irrigated acres (1000s of acres)

Ferry-Stevens (FER)

Year Sprinkler Gravity Total1925 0.0 5.7 5.71928 0.0 5.7 5.71948 0.0 10.0 10.01966 11.0 10.0 21.01978 19.4 2.3 21.71988 22.2 0.5 22.71999 16.5 0.3 16.82008 17.0 0.0 17.1

Irrigated acres (1000s of acres)

Page D-78

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

Year Sprinkler Gravity Total1925 0.0 36.3 36.31928 0.0 37.2 37.21948 0.0 48.0 48.01966 30.5 25.4 55.91978 61.5 1.0 62.51988 62.3 0.0 62.31999 55.2 0.0 55.22008 90.9 8.1 99.0

Irrigated acres (1000s of acres)

Page D-79

D.7.4 Lower Snake Basin Upper Salmon (UPS)

Year Sprinkler Gravity Total1925 0.0 83.5 83.51928 0.0 84.3 84.31950 0.0 107.4 107.41966 4.0 118.4 122.41978 27.6 93.4 121.01988 22.7 82.1 104.81999 27.2 76.6 103.82008 49.4 66.7 116.1

Irrigated acres (1000s of acres)

Lower Salmon (LWS)

Year Sprinkler Gravity Total1925 0.0 15.8 15.81928 0.0 16.6 16.61950 0.0 16.6 16.61966 1.0 15.6 16.61978 3.0 14.6 17.61988 2.4 10.3 12.71999 2.7 12.9 15.62008 4.0 8.8 12.7

Irrigated acres (1000s of acres)

Grande Ronde at Wenaha (WEN)

Year Sprinkler Gravity Total1925 0.0 90.7 90.71928 0.0 92.1 92.11950 1.1 95.4 96.51966 20.0 77.0 97.01978 55.0 32.7 87.71988 43.8 36.0 79.81999 55.3 29.7 85.02008 70.0 34.5 104.5

Irrigated acres (1000s of acres)

Clearwater (CLR)

Year Sprinkler Gravity Total1925 0.0 3.6 3.61928 0.0 3.4 3.41950 0.0 3.5 3.51966 2.0 1.0 3.01978 2.4 0.0 2.41988 5.0 0.0 5.01999 6.4 0.3 6.72008 2.0 1.7 3.7

Irrigated acres (1000s of acres)

Page D-80

Palouse-Lower Snake (PLS)

Year Sprinkler Gravity Total1925 0.0 27.6 27.61928 0.0 26.6 26.61946 0.0 26.6 26.61950 13.3 14.3 27.61966 23.0 3.0 26.01978 56.1 0.1 56.21988 63.8 0.0 63.81999 60.7 0.1 60.82008 100.1 7.2 107.3

Irrigated acres (1000s of acres)

Page D-81

D.7.5 Lower Columbia Basin Walla Walla (WWA)

Year Sprinkler Gravity Total1925 0.0 26.2 26.21928 0.0 25.8 25.81946 0.0 25.8 25.81950 7.3 28.3 35.61966 5.4 42.8 48.21978 60.4 15.0 75.41988 88.6 3.1 91.71999 107.0 0.5 107.52008 80.0 1.3 81.4

Irrigated acres (1000s of acres)

Pumping from McNary to Northside + Returns (NSM, NSR)

Year Sprinkler Gravity Total1925 0.0 3.2 3.21928 0.0 3.2 3.21950 0.0 3.2 3.21966 4.1 0.0 4.11978 34.1 0.0 34.11988 41.5 0.0 41.51999 44.1 0.0 44.12008 59.6 7.9 67.5

Irrigated acres (1000s of acres)

Pumping From McNary to Umatilla + Returns (UMP, UMR)

Year Sprinkler Gravity Total1925 0.0 0.0 0.01950 0.0 0.0 0.01966 8.1 0.0 8.11978 37.8 0.0 37.81988 44.6 0.0 44.61999 35.6 0.0 35.62008 19.6 1.8 21.4

Irrigated acres (1000s of acres)

Umatilla River & Willow Creek (UMW)

Year Sprinkler Gravity Total1925 0.0 50.2 50.21928 0.0 50.6 50.61946 0.0 52.0 52.01950 11.0 41.6 52.61966 18.7 27.3 46.01978 22.5 15.4 37.91988 25.1 19.5 44.61999 22.9 12.8 35.72008 19.6 1.8 21.4

Irrigated acres (1000s of acres)

Page D-82

Pumping from John Day to Northside + Returns (NSJ)

Year Sprinkler Gravity Total1925 0.0 0.0 0.01928 0.0 0.0 0.01950 0.0 0.0 0.01966 0.0 0.0 0.01978 15.0 0.0 15.01988 18.1 0.0 18.11999 19.3 0.0 19.32008 26.0 3.5 29.5

Irrigated acres (1000s of acres)

Pumping from John Day to Morrow & Gilliam Counties (JDP)

Year Sprinkler Gravity Total1925 0.0 0.0 0.01966 0.0 0.0 0.01978 74.0 0.0 74.01988 89.2 0.0 89.21999 71.3 0.0 71.32008 39.1 3.6 42.8

Irrigated acres (1000s of acres)

John Day (JDA)

Year Sprinkler Gravity Total1925 0.0 45.3 45.31928 0.0 47.1 47.11946 0.0 50.3 50.31966 10.0 46.4 56.41978 15.9 41.9 57.81988 18.1 23.8 41.91999 39.8 16.0 55.82008 20.2 32.6 52.8

Irrigated acres (1000s of acres)

Deschutes - White River Wapanita (WHT)

Year Sprinkler Gravity Total1925 0.0 5.5 5.51928 0.0 5.5 5.51966 5.0 8.9 13.91978 6.8 10.2 17.01988 13.1 0.7 13.81999 11.0 1.2 12.22008 6.2 0.3 6.5

Irrigated acres (1000s of acres)

Page D-83

Klickitat (KLC)

Year Sprinkler Gravity Total1925 0.0 7.2 7.21928 0.0 7.2 7.21950 0.5 7.3 7.81966 0.2 7.5 7.71978 5.2 4.0 9.21988 10.1 1.6 11.71999 11.4 1.1 12.52008 22.7 3.0 25.8

Irrigated acres (1000s of acres)

Hood River (HOD)

Year Sprinkler Gravity Total1925 0.0 25.2 25.21928 0.0 25.2 25.21950 0.0 30.0 30.01966 20.0 16.9 36.91978 35.0 0.0 35.01988 32.2 0.7 32.91999 38.6 0.0 38.62008 30.6 0.5 31.2

Irrigated acres (1000s of acres)

White Salmon (WHS)

Year Sprinkler Gravity Total1925 0.0 4.8 4.81928 0.0 4.8 4.81950 0.0 4.8 4.81966 0.3 4.8 5.11978 0.5 4.8 5.31988 4.8 1.6 6.41999 6.2 0.6 6.82008 0.8 0.0 0.9

Irrigated acres (1000s of acres)

Page D-84

D.7.6 Willamette Basin

Willamette (WMT)

Year Sprinkler Gravity Total1928 0.0 3.9 3.91950 48.8 5.8 54.61966 137.1 5.4 142.51978 214.4 5.1 219.51988 208.5 1.1 209.61999 186.6 3.2 189.82008 171.2 0.5 171.7

Irrigated acres (1000s of acres)

*Fern Ridge (FRN)

Year Sprinkler Gravity Total1925 0.0 0.0 0.01928 0.0 0.0 0.01950 1.0 0.0 1.01966 1.5 0.0 1.51978 1.5 0.0 1.51988 1.4 0.0 1.41999 1.4 0.0 1.42008 3.7 0.0 3.7

* FRN irrigated acreage is included in WMT

Irrigated acres (1000s of acres)

Page D-85

D.8 Incremental Surface Water Irrigated Acreage

D.8.1 Upper Columbia and Kootenay Basins Upper Columbia above Mica (UPC)

Year Sprinkler Gravity Total1925 4.9 -3.3 1.61928 4.9 -3.4 1.51950 4.9 -5.1 -0.21966 1.4 -3.8 -2.41978 -0.9 -4.7 -5.61988 -5.1 -2.7 -7.81999 -6.1 -1.5 -7.62008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Hugh Keenleyside (ARD)

Year Sprinkler Gravity Total1925 2.0 -0.5 1.51928 2.0 -0.5 1.51950 2.0 -0.8 1.21966 1.4 -0.5 0.91978 0.8 -0.7 0.11988 -2.1 -0.3 -2.41999 -2.0 -0.2 -2.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

East Kootenay (EKO)

Year Sprinkler Gravity Total1925 13.4 -3.1 10.31928 13.4 -3.2 10.21950 13.4 -5.0 8.41966 8.8 -6.6 2.21978 5.2 -8.9 -3.71988 -6.6 -5.1 -11.71999 -13.8 -1.5 -15.32008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-86

West Kootenay (WKO)

Year Sprinkler Gravity Total1925 5.1 -1.2 3.91928 5.1 -1.2 3.91950 5.1 -3.4 1.71966 2.4 -3.0 -0.61978 -1.2 -5.0 -6.21988 -5.4 -3.4 -8.81999 -10.2 -1.3 -11.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Kootenai-Montana (KMT)

Year Sprinkler Gravity Total1925 4.7 -6.4 -1.61928 4.7 -6.6 -1.81950 4.7 -6.6 -1.81966 2.5 -5.6 -3.01978 -1.2 -5.0 -6.11988 -0.1 -4.0 -4.01999 2.3 -6.1 -3.72008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Kootenai-Idaho (KID)

Year Sprinkler Gravity Total1925 0.6 0.0 0.61928 0.6 -0.1 0.51948 0.6 -0.1 0.51965 -0.2 0.3 0.11978 -2.3 0.8 -1.51988 -1.7 0.9 -0.81999 -1.9 0.9 -0.92008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Brilliant (BRI)

Year Sprinkler Gravity Total1925 0.4 -0.5 -0.11928 0.4 -0.5 -0.11950 0.4 -0.9 -0.51966 -0.1 -0.7 -0.81978 -1.6 -1.8 -3.41988 -3.3 -0.5 -3.81999 -3.2 -0.4 -3.62008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-87

Columbia at Trail (CTR)

Year Sprinkler Gravity Total1925 0.4 -0.2 0.21928 0.4 -0.2 0.21950 0.4 -0.4 0.01966 0.1 -0.4 -0.31978 -0.1 -0.3 -0.41988 -1.2 -0.1 -1.31999 -1.2 0.0 -1.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-88

D.8.2 Pend Oreille and Spokane Basins Upper Flathead (FLT)

Year Sprinkler Gravity Total1925 22.3 -3.8 18.61928 22.3 -3.6 18.81950 22.3 -6.1 16.31966 12.9 -14.3 -1.31978 0.4 -11.0 -10.51988 0.7 -10.8 -10.01999 -5.1 -6.8 -11.82008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Flathead Irrigation District (FID)

Year Sprinkler Gravity Total1925 74.1 -6.4 67.81928 74.1 -8.4 65.81950 74.1 -68.4 5.81966 43.5 -60.9 -17.31978 -4.8 -23.0 -27.71988 2.2 -18.7 -16.41999 -17.0 -5.0 -21.92008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Bitterroot (BIT)

Year Sprinkler Gravity Total1925 56.2 -81.8 -25.61928 56.2 -78.8 -22.61950 56.2 -78.8 -22.61966 20.2 -40.8 -20.61978 -9.2 -16.8 -26.01988 0.9 -9.8 -8.91999 -14.0 5.8 -8.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-89

Upper Clark Fork (UCF)

Year Sprinkler Gravity Total1925 77.4 -56.4 21.01928 77.4 -55.6 21.81950 77.4 -58.6 18.81966 71.7 -52.2 19.51978 45.0 -25.5 19.51988 40.8 -38.0 2.81999 -0.5 5.7 5.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Lower Clark Fork (LCF)

Year Sprinkler Gravity Total1925 10.3 -11.5 -1.21928 10.3 -11.7 -1.41950 10.3 -16.2 -5.91966 2.3 -15.2 -12.91978 -10.8 -5.0 -15.81988 -3.2 -1.8 -5.01999 -1.0 -0.5 -1.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Pend Oreille Basin in USA (PEN)

Year Sprinkler Gravity Total1925 1.2 -3.2 -2.01928 1.2 -3.3 -2.11950 1.2 -5.0 -3.81966 -4.0 -1.5 -5.51978 -7.0 0.3 -6.71988 -3.5 -2.2 -5.71999 -2.8 0.3 -2.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Pend Oreille Basin in Canada (POC)

Year Sprinkler Gravity Total1925 0.9 0.0 0.91928 0.9 0.0 0.91950 0.9 -0.2 0.71966 0.6 -0.1 0.51978 0.3 -0.3 0.01988 0.3 -0.1 0.21999 0.0 0.0 0.02008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-90

Spokane (SPV)

Year Sprinkler Gravity Total1928 23.6 -22.4 1.21987 -8.1 -1.4 -9.51992 -8.7 -1.9 -10.61995 -13.4 -0.6 -14.02000 -2.0 -0.9 -2.92002 -1.9 -0.2 -2.12005 -2.9 -0.7 -3.62007 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-91

D.8.3 Mid-Columbia Basin Okanagan (OKA)

Year Sprinkler Gravity Total1925 60.4 -81.6 -21.21928 60.4 -78.0 -17.61950 60.4 -90.6 -30.21966 8.9 -63.2 -54.31978 -11.8 -59.1 -70.91988 -16.9 -23.4 -40.31999 -59.8 -2.3 -62.12008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Methow-Okanogan (OKM)

Year Sprinkler Gravity Total1925 30.7 -31.7 -1.01928 30.7 -31.0 -0.31948 30.7 -34.7 -4.01966 14.7 -18.2 -3.51978 -8.7 0.3 -8.41988 -12.2 -0.6 -12.81999 -8.7 0.3 -8.42008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Kettle (KET)

Year Sprinkler Gravity Total1925 7.4 -3.2 4.21928 7.4 -3.3 4.11950 7.4 -4.5 2.91966 2.5 -4.5 -2.01978 -4.4 -8.0 -12.41988 -13.2 -5.2 -18.41999 -15.6 -2.6 -18.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-92

Ferry-Stevens (FER)

Year Sprinkler Gravity Total1925 17.0 -5.7 11.41928 17.0 -5.7 11.41948 17.0 -10.0 7.11966 6.0 -10.0 -3.91978 -2.4 -2.3 -4.61988 -5.2 -0.5 -5.61999 0.5 -0.3 0.32008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Chelan-Entiat-Wenatchee-W Banks Lake (CEW)

Year Sprinkler Gravity Total1925 90.9 -28.2 62.71928 90.9 -29.1 61.81948 90.9 -39.9 51.01966 60.4 -17.3 43.11978 29.4 7.1 36.51988 28.6 8.1 36.71999 35.7 8.1 43.82008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-93

D.8.4 Lower Snake Basin Upper Salmon (UPS)

Year Sprinkler Gravity Total1925 49.4 -16.8 32.61928 49.4 -17.6 31.81950 49.4 -40.7 8.71966 45.4 -51.7 -6.31978 21.8 -26.7 -4.91988 26.7 -15.4 11.31999 22.2 -9.9 12.32008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Lower Salmon (LWS)

Year Sprinkler Gravity Total1925 4.0 -7.0 -3.11928 4.0 -7.8 -3.91950 4.0 -7.8 -3.91966 3.0 -6.8 -3.91978 1.0 -5.8 -4.91988 1.6 -1.5 0.01999 1.3 -4.1 -2.92008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Grande Ronde at Wenaha (WEN)

Year Sprinkler Gravity Total1925 70.0 -56.2 13.81928 70.0 -57.6 12.41950 68.9 -60.9 8.01966 50.0 -42.5 7.51978 15.0 1.8 16.81988 26.2 -1.5 24.71999 14.7 4.8 19.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-94

Clearwater (CLR)

Year Sprinkler Gravity Total1925 2.0 -1.9 0.11928 2.0 -1.7 0.31950 2.0 -1.8 0.21966 0.0 0.7 0.71978 -0.4 1.7 1.31988 -3.0 1.7 -1.31999 -4.4 1.4 -3.02008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Palouse-Lower Snake (PLS)

Year Sprinkler Gravity Total1925 100.1 -20.4 79.71928 100.1 -19.4 80.71946 100.1 -19.4 80.71950 86.8 -7.1 79.71966 77.1 4.2 81.31978 44.0 7.1 51.11988 36.3 7.2 43.51999 39.4 7.1 46.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-95

D.8.5 Lower Columbia Basin Walla Walla (WWA)

Year Sprinkler Gravity Total1925 80.0 -24.9 55.21928 80.0 -24.5 55.61946 80.0 -24.5 55.61950 72.7 -27.0 45.81966 74.6 -41.5 33.21978 19.6 -13.7 6.01988 -8.6 -1.8 -10.31999 -27.0 0.8 -26.12008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Pumping from McNary to Northside + Returns (NSM, NSR)

Year Sprinkler Gravity Total1925 59.6 4.7 64.31928 59.6 4.7 64.31950 59.6 4.7 64.31966 55.5 7.9 63.41978 25.5 7.9 33.41988 18.1 7.9 26.01999 15.5 7.9 23.42008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Pumping From McNary to Umatilla + Returns (UMP, UMR)

Year Sprinkler Gravity Total1925 19.6 1.8 21.41950 19.6 1.8 21.41966 11.5 1.8 13.31978 -18.2 1.8 -16.41988 -25.0 1.8 -23.21999 -16.0 1.8 -14.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Page D-96

Umatilla River & Willow Creek (UMW)

Year Sprinkler Gravity Total1925 0.0 50.2 50.21928 0.0 50.6 50.61946 0.0 52.0 52.01950 11.0 41.6 52.61966 18.7 27.3 46.01978 22.5 15.4 37.91988 25.1 19.5 44.61999 22.9 12.8 35.72008 19.6 1.8 21.4

Irrigated acres (1000s of acres)

Pumping from John Day to Northside + Returns (NSJ)

Year Sprinkler Gravity Total1925 26.0 3.5 29.51928 26.0 3.5 29.51950 26.0 3.5 29.51966 26.0 3.5 29.51978 11.0 3.5 14.51988 7.9 3.5 11.41999 6.7 3.5 10.22008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Pumping from John Day to Morrow & Gilliam Counties (JDP)

Year Sprinkler Gravity Total1925 39.1 3.6 42.81966 39.1 3.6 42.81978 -34.9 3.6 -31.21988 -50.1 3.6 -46.41999 -32.2 3.6 -28.52008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

John Day (JDA)

Year Sprinkler Gravity Total1925 20.2 -12.7 7.51928 20.2 -14.5 5.71946 20.2 -17.7 2.51966 10.2 -13.8 -3.61978 4.3 -9.3 -5.01988 2.1 8.8 10.91999 -19.6 16.6 -3.02008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-97

Deschutes - White River Wapanita (WHT)

Year Sprinkler Gravity Total1925 -26.1 -3.8 -29.91928 -30.8 -2.5 -33.31966 -19.4 -2.8 -22.21978 -19.3 -2.1 -21.41988 -20.3 -2.6 -22.91999 -17.3 -1.9 -19.32008 6.2 0.3 6.5

Incremental Irrigated acres (1000s of acres)

Klickitat (KLC)

Year Sprinkler Gravity Total1925 22.7 -4.2 18.61928 22.7 -4.2 18.61950 22.2 -4.3 18.01966 22.5 -4.5 18.11978 17.5 -1.0 16.61988 12.6 1.4 14.11999 11.3 1.9 13.32008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Hood River (HOD)

Year Sprinkler Gravity Total1925 30.6 -24.7 6.01928 30.6 -24.7 6.01950 30.6 -29.5 1.21966 10.6 -16.4 -5.71978 -4.4 0.5 -3.81988 -1.6 -0.2 -1.71999 -8.0 0.5 -7.42008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

White Salmon (WHS)

Year Sprinkler Gravity Total1925 0.8 -4.8 -3.91928 0.8 -4.8 -3.91950 0.8 -4.8 -3.91966 0.5 -4.8 -4.21978 0.3 -4.8 -4.41988 -4.0 -1.6 -5.51999 -5.4 -0.6 -5.92008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres)

Page D-98

Page D-99

D.8.6 Willamette Basin

Willamette (WMT)

Year Sprinkler Gravity Total1928 171.2 -3.4 167.81950 122.4 -5.3 117.11966 34.1 -4.9 29.21978 -43.2 -4.6 -47.81988 -37.3 -0.6 -37.91999 -15.4 -2.7 -18.12008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

Fern Ridge (FRN)

Year Sprinkler Gravity Total1925 3.7 0.0 3.71928 3.7 0.0 3.71950 2.7 0.0 2.71966 2.2 0.0 2.21978 2.2 0.0 2.21988 2.3 0.0 2.31999 2.3 0.0 2.32008 0.0 0.0 0.0

Incremental Irrigated acres (1000s of acres) 2008 minus other years

This page is intentionally left blank

Appendix E – Routing Diagram Routing details for all basins in the form of diagrams as well as equations are shown upstream to downstream in the following pages. The equations on the left-hand-side pages correspond to the diagrams on the right-hand-side pages. At locations where local flows were indexed, details regarding the indexing are included.

Page E-1

MCD_H + MCD_S = MCD_A

BCHydro provided quality controlled data used for MCD_A after 12/31/1971.

RVC_A – (MCD_H routed to RVC) = RVC_L BCHydro provided quality controlled data used for RVC_L after 12/31/1983.

(MCD_A routed to RVC) + RVC_L = RVC_ARF

RVC_H + RVC_S = RVC_A

ARD_A – (RVC_H routed to ARD) = ARD_L BCHydro provided quality controlled data used for ARD_L after 12/31/1971.

(RVC_ARF routed to ARD) + ARD_L = ARD_ARF

ARD_H + ARD_S = ARD_A

Page E-2

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramUpper Columbia River

RVC_A

RVC_ARF

MCD_A

MCD_S

MCD_H

RVC_L

RVC_S

RVC_H

From page E-5

ARD_ARF

Continue page E-5

ARD_L

Mica Dam

Revelstoke Canyon Dam

ARD_A

Page E-3

ARD_H + ARD_S = ARD_A

MUC_H – ((ARD_H + BRI_H) routed to MUC) = MUC_L

((ARD_ARF + BRI_ARF) routed to MUC) + MUC_L = MUC_ARF

Page E-4

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

MUC_ARF

ARD_S

ARD_H

MUC_L

Continue page E-25 Continue page E-25

Hugh Keenleyside Dam

Proposed Murphy Creek DamColumbia River at Birchbank (Trail)

To page E-3

Upper Columbia RiverFrom page E-3 and E-9

ARD_ARF+BRI_ARF

ARD_H + BRI_H

Add Kootenay River

From page E-9

Add Kootenay River

From page E-9

MUC_H

Page E-5

LIB_H + LIB_S = LIB_A BFE_H - (LIB_H routed to BFE) = BFE_L (LIB_A routed to BFE) + BFE_L = BFE_ARF

DCD_H = DCD_S = DCD_A

BCHydro provided quality controlled data used for DCD_A after 4/30/1967.

COR_A – ((BFE_H routed to COR) + DCD_H) = COR_L

(BFE_ARF routed to COR) + DCD_A + COR_L = COR_ARF

Page E-6

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramKootenay River

BFE_ARF

LIB_A

LIB_S

LIB_H

BFE_L

Continue page E-9 Continue page E-9

Libby Dam

Bonners Ferry, ID.

BFE_H

DCD_S

DCD_HDuncan Dam

DCD_A

Page E-7

COR_A – ((BFE_H routed to COR) + DCD_H) = COR_L

(BFE_ARF routed to COR) + DCD_A + COR_L = COR_ARF

COR_H + KOO_S = COR_A

BRI_H – COR_H = BRI_L

COR_ARF + BRI_L = BRI_ARF

Page E-8

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

BRI_ARFBRI_L

Continue page E-5 Continue page E-5

Brilliant Dam

From page E-7 From page E-7

COR_ARF

BFE_H rt +DCD_H

Kootenay River

COR_L

BFE_H rt +DCD_A

K00_S

COR_HKootenay Lake,Corra Linn Dam

BRI_H

COR_A

Page E-9

HGH_H + HGH_S = HGH_A

CFM_H – (HGH_H routed to CFM_H) = CFM_L

(HGH_A routed to CFM) + CFM_L = CFM_ARF

KER_A – (CFM_H routed to KER) = KER_L

KER_L [the reach below CFM] is indexed to: Jul-1928 Sep-2008 Swan River nr Bigfork MT, 12370000

(CFM_ARF routed to KER) + KER_L = KER_ARF

KER_H + KER_S = KER_A

Page E-10

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramFlathead River

CFM_ARF

HGH_A

HGH_S

HGH_H

CFM_L

From page E-13

KER_ARF

Continue page E-13

KER_L

Hungry Horse Dam

Columbia Falls, MTCFM_H

INDEX

KER_A

Page E-11

KER_H + KER_S = KER_A

TOM_H – (KER_H routed to TOM) = TOM_L

(KER_ARF routed to TOM) + TOM_L = TOM_ARF

NOX_A – (TOM_H routed to NOX) = NOX_L

NOX_L [the reach below TOM] is indexed to: Oct-1999 Sep-2008 Prospect Creek at Thompson Falls MT, 12390700

(TOM_ARF routed to NOX) + NOX_L = NOX_ARF

NOX_H + NOX_S = NOX_A

Page E-12

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramFlathead/Clark Fork River

TOM_ARFTOM_L

NOX_S

NOX_H

Continue page E-15

NOX_ARF

Continue page E-15

NOX_L

Noxon Rapids Dam

KER_S

KER_H

Thompson Falls Dam

To page E-11 From page E-11

TOM_H

Flathead Lake, Kerr Dam

NOX_A

Page E-13

CAB_A – (NOX_H routed to CAB) = CAB_L

CAB_L [the reach below NOX] is indexed to: Oct-1999 Sep-2008 Prospect Creek at Thompson Falls MT, 12390700

(NOX_ARF routed to CAB) + CAB_L = CAB_ARF

CAB_H + CAB_S = CAB_A

PSL_H + PSL_S = PSL_A

ALF_A – ((CAB_H + PSL_H routed) to ALF) = ALF_L

((CAB_ARF + PSL_A) routed to ALF) + ALF_L = ALF_ARF

ALF_H + ALF_S = ALF_A

Page E-14

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramClark Fork/Priest River

CAB_ARFCAB_L

PSL_S

PSL_H

(CAB

_H +

PSL

_H) r

t

Continue page E-17 Continue page E-17

CAB_S

CAB_HCabinet Gorge Dam

From page E-13 From page E-13

CAB_H + PSL_H

CAB_ARF+PSL_A

Priest Lake

PSL_A

CAB_A

Page E-15

ALF_A – ((CAB_H + PSL_H routed) to ALF) = ALF_L

ALF_L [the reach below CAB] is indexed to: Oct-1999 Sep-2008 Priest River nr Priest River ID, 12395000

((CAB_ARF + PSL_A) routed to ALF) + ALF_L = ALF_ARF

ALF_H + ALF_S = ALF_A

From 07/01/1928 – 09/30/1999:

From 10/01/1999 – 09/30/2008:

BOX_A – (ALF_H routed to BOX) = BOX_L

(ALF_ARF routed to BOX) + BOX_L = BOX_ARF

BOX_H + BOX_S = BOX_A

BDY_A – (BOX_H routed to BDY) = BDY_L

(BOX_ARF routed to BDY) + BDY_L = BDY_ARF

BDY_H + BDY_S = BDY_A

BDY_A – (ALF_H routed to BDY) = (BOX + BDY)_L where (BOX+ BDY)_L = combined local btw ALF and BDY

0.7 * (BOX + BDY)_L = BOX_L Fraction of combined local based on drainage area proportion

(ALF_ARF routed to BOX) + BOX_L = BOX_ARF

0.3 * (BOX + BDY)_L = BDY_L Fraction of combined local based on drainage area proportion

(BOX_ARF routed to BDY) + BDY_L = BDY_ARF

BDY_H + BDY_S = BDY_A

Page E-16

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramPend Oreille River

ALF_A

ALF_ARFALF_L

ALF_S

ALF_H

BOX_ARF

Continue page E-19

BOX_L

Box Canyon Dam

Pend Oreille LakeAlbeni Falls Dam

From page E-15 From page E-15

Continue page E-19

BOX_L + BDY_L (ratio=7:3)

BDY_A

Page E-17

From 07/01/1928 – 09/30/1999:

From 10/01/1999 – 09/30/2008:

Salmo River near Salmo = SEV_L observed and estimated flow of 08NE044 and 08NE074

BDY_H + SEV_L – SEV_S = SEV_H

BDY_ARF + SEV_L = SEV_ARF

SEV_H – WAT_S = WAT_H

SEV_ARF + WAT_S = WAT_ARF

BDY_A – (BOX_H routed to BDY) = BDY_L

(BOX_ARF routed to BDY) + BDY_L = BDY_ARF

BDY_H + BDY_S = BDY_A

0.3 * (BOX + BDY)_L = BDY_L Fraction of combined local based on drainage area proportion

(BOX_ARF routed to BDY) + BDY_L = BDY_ARF

BDY_H + BDY_S = BDY_A

Page E-18

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramPend Oreille River

BDY_A

BDY_ARFBDY_L

BDY_S

BDY_H

Continue page E-25 Continue page E-25

SEV_L

Seven Mile Dam

Boundary Dam

From page E-17

WAT_ARF

WAT_S

ComputedSEV_H

ComputedWAT_H Waneta Dam

minus plus

SEV_ARFSEV_S

WAT_LNegligible

Continue page E-17

Page E-19

COE_H + COE_S = COE_A

UPF_H – (COE_H routed to UPF) = UPF_L

(COE_A routed to UPF) + UPF_L = UPF_ARF

NIN_H – (UPF_H routed to NIN) = NIN_L

(UPF_ARF routed to NIN) + NIN_L = NIN_ARF

Page E-20

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramSpokane River

UPF_ARF

COE_A

COE_S

COE_H

UPF_L

Continue page E-23

NIN_ARF

Continue page E-23

NIN_L

Coeur d’Alene Lake, Post Falls Dam

Upper Falls DamUPF_H

NIN_H Nine Mile Dam

Page E-21

LLK_A – (NIN_H routed to LLK) = LLK_L

(NIN_ARF routed to LLK) + LLK_L = LLK_ARF

LLK_H + LLK_S = LLK_A

Page E-22

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

LLK_A

LLK_ARFLLK_L

LLK_S

LLK_H

Continue page E-25 Continue page E-25

Long Lake Dam

From page E-21 From page E-21

Spokane River

Page E-23

(MUC_H routed to CIB) + WAT_H + LLK_H = CIB_H

CIB = Columbia River at International Boundary

Note: LLK is summed at CIB for modeling convenience even though the Spokane River confluence with the Columbia River is in the U.S.

GCL_A – (CIB_H routed to GCL) = GCL_L

GCL_L [the reach below MUC + WAT + LLK] is indexed to: Jul-1928 Sep-1929 Colville River at Kettle Falls WA, 12409000 Oct-1929 Sep-2008 Colville R. at Kettle Falls WA + Kettle R. nr Laurier WA, 12404500

(MUC_ARF routed to CIB) + WAT_ARF + LLK_ARF = CIB_ARF

(CIB_ARF routed to GCL) + GCL_L = GCL_ARF

GCL_H + GCL_S + FDR_P + FDR_G = GCL_A

FDR_P = Pumping to Banks Lake from Franklin D Roosevelt Reservoir FDR_G = Generation from Banks Lake to Franklin D Roosevelt Reservoir

CHJ_A – (GCL_H routed to CHJ) = CHJ_L

(GCL_ARF routed to CHJ) + CHJ_L = CHJ_ARF

CHJ_H + CHJ_S = CHJ_A

Page E-24

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramMiddle Columbia River

GCL_A

GCL_S

GCL_H

Continue page E-27

GCL_ARF

Continue page E-27

GCL_L

Grand Coulee Dam

INDEX

MUC_ARF rt +WAT_ARF +

LLK_ARF

MUC_H rt +WAT_H +

LLK_H

Add Pend Oreille River

From page E-19

From page E-5 From page E-5Add Pend Oreille River

From page E-19

Add Spokane River

From page E-23

Add Spokane River

From page E-23

Add Columbia River Add Columbia River

FDR_G

FDR_P

Page E-25

CHJ_A – (GCL_H routed to CHJ) = CHJ_L

CHJ_L [the reach below GCL]:

Jul-1928 Mar-1952 No local added. GCL flows routed to CHJ. No gaged tributary and no reservoir measurements available to calculate a local.

Apr-1952 Sep-2008 Indexed to Okanogan River nr Tonasket WA, 12445000

(GCL_ARF routed to CHJ) + CHJ_L = CHJ_ARF

CHJ_H + CHJ_S = CHJ_A

WEL_L + (CHJ_H routed to WEL) = WEL_A

WEL_L [the reach below CHJ]: Jul-1928 Apr-1929 Indexed to Methow River nr Pateros WA, 12449950

Methow at Pateros estimated using Methow at Twisp, 12449500, multiplied by a factor of 1.152

May-1929 Sep-1929 Indexed to Okanogan River at Tonasket WA, 12445000 + Methow River nr Pateros WA Pateros estimated as above

Oct-1929 Sep-1933 Indexed to Okanogan River at Tonasket WA Note: Twisp record missing so an estimated Pateros not used

Oct-1933 Mar-1959 Indexed to Okanogan R. at Tonasket WA + Methow R. nr Pateros WA Pateros estimated as above

Apr-1959 Sep-1959 Indexed to Okanogan R. at Tonasket WA + Methow R. nr Pateros WA Pateros available April, 1959, so not estimated

Oct-1959 Nov-1965 Equals to Okanogan R. nr Malott WA,12447300 + Methow R. nr Pateros WA

Dec-1965 Sep-2008 Equals to Okanogan R. at Malott WA,12447200 + Methow R. nr Pateros WA

(CHJ_ARF routed to WEL) + WEL_L = WEL_ARF

WEL_A - WEL_S = WEL_H

RRH_L + ((WEL_H routed to RRH) + CHL_H) = RRH_A RRH_L is indexed [see next page]

(WEL_ARF routed to RRH) + RRH_L + CHL_A = RRH_ARF

CHL_H + CHL_S = CHL_A

CHL_A:

Jul-1928 Sep-2008 Indexed to Stehekin River at Stehekin WA, 12451000

Page E-26

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

WEL_ARFWEL_L INDEX

CHJ_ARFCHJ_L INDEX

From page E-25 From page E-25

WEL_A

WEL_S

WEL_HWells Dam

CHJ_A

CHJ_S

CHJ_HChief Joseph Dam

Middle Columbia River

Continue page E-29 Continue page E-29

Page E-27

CHL_H + CHL_S = CHL_A

CHL_A: Jul-1928 Sep-2008 Indexed to Stehekin River at Stehekin WA, 12451000

RRH_L + ((WEL_H routed to RRH) + CHL_H) = RRH_A

RRH_L [the reach below WEL]:

Jul-1928 Sep-1929 Indexed to Methow River at Pateros WA, 12449550 Methow at Pateros estimated using Methow at Twisp, 12449500, multiplied by a factor of 1.152

Oct-1929 Sep-1947 Indexed to Wenatchee River at Peshastin WA, 12459000 Oct-1947 Sep-1948 Indexed to Wenatchee River at Peshastin WA

Peshatin estimated using (Wenatchee R. at Plain WA, 12457000 + Icicle Ck.abv Snow Ck nr Leavenworth WA, 12458000) multiplied by 1.098

Oct-1948 Sep-1959 Indexed to Wenatchee River at Peshastin WA Oct-1959 Mar-1996 Equals to Entiat River nr Entiat WA, 12452990

Entiat nr Entiat estimated using correlation with Entiat nr Ardenvoir, 12452800

Mar-1996 Sep-2008 Equals to Entiat River nr Entiat WA Notes: No reason for choosing Wenatchee at Peshatin (downstream) over Methow at Pateros (upstream) except completeness of record. Problem in smoothing Lake Chelan inflow so not used.

(WEL_ARF routed to RRH) + RRH_L + CHL_A = RRH_ARF

RRH_A - RRH_S = RRH_H

RIS_L + (RRH_H routed to RIS) = RIS_A

RIS_L [the reach below RRH]:

Jul-1928 Sep-1929 Indexed to Methow River at Pateros WA, 12449550 Methow at Pateros estimated using Methow R. at Twisp, 12449500, multiplied by a factor of 1.152

Oct-1929 Sep-1947 Indexed to Wenatchee River at Peshastin WA, 12459000 Oct-1947 Sep-1948 Indexed to Wenatchee River at Peshastin WA

Peshatin estimated using (Wenatchee R. at Plain WA, 12457000 + Icicle Ck.abv Snow Ck nr Leavenworth WA, 12458000) multiplied by 1.098

Oct-1948 Sep-1959 Indexed to Wenatchee River at Peshastin WA Oct-1959 Sep-1962 Equals to Wenatchee River at Monitor WA, 12462500

Wenatchee at Monitor estimated using correlation with Wenatchee at Peshastin

Oct-1962 Sep-2008 Equals to Wenatchee River at Monitor WA, 12462500

(RRH_ARF routed to RIS) + RIS_L = RIS_ARF

RIS_A - RIS_S = RIS_H

Page E-28

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

RIS_ARFRIS_L INDEX

RRH_ARFRRH_L INDEX

From page E-27 From page E-27

RRH_A

RRH_S

RRH_HRocky Reach Dam

CHL_A

CHL_S

CHL_HChelan Lake and Dam

Middle Columbia River

From page E-31 Continue page E-31

WEL

_H rt

+C

HL_

H

RIS_A

Page E-29

RIS_A - RIS_S = RIS_H

(RIS_H routed to WAN) – WAN_S = WAN_H

(RIS_ARF routed to WAN) = WAN_ARF

PRD_A – (WAN_H routed to PRD) = PRD_L

PRD_L [the reach below WAN]: Jul-1928 Sep-1929 Indexed to Methow River at Pateros WA, 12449550

Methow at Pateros estimated using Methow R. at Twisp, 12449500, multiplied by a factor of 1.152

Oct-1929 Sep-1947 Indexed to Wenatchee River at Peshastin WA, 12459000 Oct-1947 Sep-1948 Indexed to Wenatchee River at Peshastin WA

Peshastin estimated using (Wenatchee R. at Plain WA, 12457000 + Icicle Ck.abv Snow Ck nr Leavenworth WA, 12458000) multiplied by 1.098

Oct-1948 Sep-1959 Indexed to Wenatchee River at Peshastin WA Oct-1959 Sep-2008 Equals to Crab Creek nr Beverly WA, 12472600 + Miscellaneous Flows

Note: Crab Creek not used for earlier period indexing because of return flow influences. Also, the shape of the computed local fit better with Peshastin than Crab Creek in early years before significant return flow.

(WAN_ARF routed to PRD) + PRD_L = PRD_ARF

PRD_H + PRD_S = PRD_A

Page E-30

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramMiddle Columbia River

PRD_A

WAN_ARF

PRD_S

PRD_H

Continue page E-41 Continue page E-41

Priest Rapids Dam

RIS_S

RIS_H

Wanapum Dam

To page E-29 From page E-29

ComputedWAN_H

Rock Island Dam

WAN_S

PRD_ARFPRD_L INDEX

WAN_Lnegligible

Page E-31

BRN_H + BRN_S = BRN_A

HCD_A – (BRN_H routed to HCD) = HCD_L

HCD_L [the reach below BRN]: Jul-1928 Jul-1965 Calculated from BRN_H and HCD_H which were

computed as documented in the Technical Appendix. Aug-1965 Sep-2008 Indexed to Imnaha River at Imnaha OR, 13292000

Note: Pine Creek gage data is fragmentary so not used to index.

(BRN_A routed to HCD) + HCD_L = HCD_ARF

HCD_H + HCD_S = HCD_A

LIM_H - (HCD_H routed to LIM) - (WHB_H routed to LIM) = LIM_L

LIM_L [the reach below HCD]: Jul-1928 Sep-1999 Equals Imnaha River at Imnaha OR, 13292000

Oct-1999 Sep-2008 Indexed to Imnaha River at Imnaha OR, 13292000

(HCD_ARF routed to LIM) + (WHB_H routed to LIM) + LIM_L = LIM_ARF

Page E-32

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramLower Snake River

BRN_A

BRN_S

BRN_H

Continue page E-35 Continue page E-35

Brownlee Dam

Hells Canyon Dam

LIM_ARF

HCD_ARFHCD_L INDEX

HCD_A

HCD_S

HCD_H

WHB_H

LIM_L INDEX

Page E-33

ANA_H – LIM_H = ANA_L

ANA_L [the reach below LIM]: Jul-1928 Jul-1958 Calculated from LIM_H, TRY_H, and ANA_H which were

computed as documented in the Technical Appendix. Aug-1958 Sep-1999 Indexed to Grande Ronde River at Troy OR, 13333000 Oct-1999 Sep-2008 Calculated as per equation.

LIM_ARF + ANA_L = ANA_ARF

DWR_H + DWR_S = DWR_A

SPD_H – ((DWR_H + ORF_H) routed to SPD) = SPD_L

((ORF_H + DWR_A) routed to SPD) + SPD_L = SPD_ARF

Page E-34

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

SPD_ARFSPD_L

ANA_ARFANA_L INDEX

From page E-33 From page E-33

DWR_A

DWR_S

DWR_HDworshak Dam

Spalding, ID

Lower Snake/Clearwater River

Continue page E-37 Continue page E-37

LIM_H

ANA_H

SPD_H

Anatone, WA

Lime Point

ORF_H +DWR_AORF_H

Page E-35

Spalding and Anatone flows are summed for convenience in modeling even though these points are not at the confluence of the Snake and Clearwater Rivers.

LWG_A – ((SPD_H + ANA_H) routed to LWG)) = LWG_L

LWG_L [the reach below ANA and SPD]: Jul-1928 Sep-1928 Indexed to Grande Ronde River at Troy OR, 13333000

Oct-1928 Sep-1959 Indexed to Asotin Creek nr Asotin WA, 13334500 Oct-1959 Aug-1983 Indexed to Asotin Creek blo Kearney Gulch nr Asotin WA, 13334700 Sep-1983 Sep-1988 Indexed to Tucannon River nr Starbuck WA, 13344500 Oct-1988 Sep-1989 Indexed to Asotin Creek at Asotin WA, 13335050 Oct-1989 Mar-1991 Indexed to Tucannon River nr Starbuck WA, 13344500 Apr-1991 Sep-1999 Indexed to Asotin Creek at Asotin WA, 13335050 Oct-1999 Sep-2008 Equals to Asotin Creek at Asotin WA, 13335050

Note: When Asotin gage information not available, Tucannon used.

((SPD_ARF + ANA_ARF) routed to LWG) + LWG_L = LWG_ARF

LWG_H + LWG_S = LWG_A

(LWG_H routed to LGS) – LGS_S = LGS_H

(LWG_ARF routed to LGS) = LGS_ARF

Page E-36

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramLower Snake River

LWG_A

LWG_S

LWG_H

Continue page E-39

LWG_ARF

Continue page E-39

LWG_L

Lower Granite Dam

INDEX

ANA_ARF +SPD_ARF

ANA_H +SPD_H

From page E-35 From page E-35

Page E-37

(LWG_H routed to LGS) – LGS_S = LGS_H

(LWG_ARF routed to LGS) = LGS_ARF

LMN_A – (LGS_H routed to LMN) = LMN_L

LMN_L [ the reach below LGS] is indexed to: Jul-1928 Sep-1928 Touchet River at Bolles WA, 14017000

Oct-1928 Sep-1931 Tucannon River nr Starbuck WA, 13344500 Oct-1931 Jan-1934 Asotin Creek nr Asotin WA, 13334500 Feb-1934 Sep-1942 SF Palouse River at Pullman WA, 13348000 Oct-1942 Sep-1951 EF Touchet River nr Dayton WA, 14016500 Oct-1951 Sep-2008 Palouse River at Hooper WA, 13351000

Note: Palouse gages are fragmentary so not always used.

(LGS_ARF routed to LMN) + LMN_L = LMN_ARF

LMN_H + LMN_S = LMN_A

LMN_H – IHR_S = IHR_H

(LMN_ARF routed to IHR) = IHR_ARF

Page E-38

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramLower Snake River

LMN_A

LGS_ARF

LNM_S

LMN_H

Continue page E-41 Continue page E-41

From page E-37 From page E-37

LGS_H

Little Goose Dam

LGS_S

Lower Monument Dam

LMN_ARFLMN_L INDEX

LGS_Lnegligible

IHR_Lnegligible

IHR_SComputed

IHR_H

IHR_ARF

Ice Harbor Dam

Page E-39

(PRD_H routed to Pasco) + (YAK_H routed to Pasco) + IHR_H = CP_H

CP = Control Point used for routing, at Pasco, Washington.

IHR_ARF + (PRD_ARF routed to Pasco) + (YAK_H routed to Pasco) = CP_ARF

MCN_A – (CP_H routed to MCN) = MCN_L

MCN_L[the ungaged area in the reach below PRD,YAK, and IHR] is indexed to: Jul-1928 Sep-1928 Touchet River at Bolles WA, 14017000

Oct-1928 Dec-1929 Tucannon River nr Starbuck WA, 13344500 Jan-1930 May-1931 NF Walla Walla River nr Milton OR, 14011000 Jun-1931 May-1941 SF Walla Walla River nr Milton OR, 14010000 Jun-1941 Sep-1951 Touchet River nr Touchet WA, 14017500 Oct-1951 Sep-2008 Walla Walla River nr Touchet WA, 14108500

(CP_ARF routed to MCN) + MCN_L = MCN_ARF

MCN_H + MCN_S = MCN_A

Page E-40

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramLower Columbia River

From page E-43

MCN_ARF

Continue page E-43

MCN_L INDEX

Add Snake River

From page E-39

From page E-31 From page E-31Add Snake River

From page E-39

CP_ARF

YAK_H

CP_H

IHR_ARFComputedIHR_H

Page E-41

MCN_H + MCN_S = MCN_A

JDA_A – (MCN_H routed to JDA) = JDA_L

JDA_L[the reach below MCN]: Jul-1928 Sep-1950 Local inflow estimated by the summation of the observed flows of

John Day and Umatilla Rivers. Oct-1950 Sep-1996 Indexed to Umatilla River nr Umatilla OR, 14033500 + John Day

River at McDonald Ferry OR, 14048000 Oct-1996 Sep-1997 Indexed to Umatilla River nr Umatilla OR, 14033500 + John Day

River at McDonald Ferry OR, 14048000 John Day at McDonald Ferry estimated using John Day R at Service Creek OR, 14046500, routed to McDonald Ferry and multiplied by a factor of 1.11

Oct-1997 Sep-2008 Indexed to Umatilla River nr Umatilla OR, 14033500 + John Day River at McDonald Ferry OR, 14048000

(MCN_ARF routed to JDA) + JDA_L = JDA_ARF

JDA_H + JDA_S = JDA_A

TDA_A – TDA_L = JDA_H

Deschutes River at Moody = TDA_L

(JDA_ARF routed to TDA) + TDA_L = TDA_ARF

TDA_H + TDA_S = TDA_A

Page E-42

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

JDA_ARFJDA_L INDEX

To page E-41 From page E-41

JDA_A

JDA_S

ComputedJDA_H John Day Dam

MCN_A

MCN_S

MCN_HMcNary Dam

Lower Columbia River

Continue page E-45 Continue page E-45

Page E-43

Deschutes River at Moody = TDA_L

TDA_H + TDA_S = TDA_A

BON_A – (TDA_H routed to BON) = BON_L

BON_L [the reach below TDA]: Jul-1928 Jul-1960 Local inflow estimated by the summation of observed and

extended flows of the Little White Salmon, Wind, Klickitat, Hood, and White Salmon Rivers.

Aug-1960 Jan-1965 Indexed to Klickitat River nr Pitt WA, 14113000 + Hood River at Tucker Bridge nr Hood River OR, 14120000 Hood River at Tucker Bridge estimated using Klickitat nr Pitt and SSARR model adjacent station computation

Jan-1965 Sep-2008 Indexed to Klickitat River nr Pitt WA, 14113000 + Hood River at Tucker Bridge nr Hood River OR, 14120000

(TDA_ARF routed to BON) + BON_L = BON_ARF

BON_H + BON_S = BON_A

Page E-44

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing Diagram

BON_ARFBON_L INDEX

TDA_ARFTDA_L

From page E-43 From page E-43

BON_S

BON_S

BON_HBonneville Dam

TDA_A

TDA_S

TDA_HThe Dalles Dam

Lower Columbia River

End

End

Page E-45

HCR_H+ HCR_S = HCR_A

LOP_A – (HCR_H routed to LOP) = LOP_L

(HCR_A routed to LOP) + LOP_L = LOP_ARF

LOP_H + (LOP_S+DEX_S) = LOP_A A smoothing technique was applied to LOP_A to eliminate the erratic, unrealistic local hydrograph that was

produced using LOP_A.

FAL_H + FAL_S = FAL_A

Page E-46

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramMiddle Fork Willamette River

LOP_A

LOP_ARF

HCR_A

HCR_S

HCR_H

LOP_L

LOP_S + DEX_S

LOP_H

Continue page E-55

Hills Creek Dam

Lookout Point &

Dexter Dams

Continue page E-55

FAL_A

FAL_S

FAL_H

LOP_A

LOP_S + DEX_S

LOP_H

Middle Fork Willamette River

Fall Creek Dam

Middle Fork Willamette River

Page E-47

COT_H + COT_S = COT_A

DOR_H + DOR_S = DOR_A

Page E-48

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramCoast Fork Willamette River

COT_A

COT_S

COT_H

Continue page E-55 Continue page E-55

Cottage Grove Dam

DOR_A

DOR_S

DOR_HDorena Dam

Coast Fork RiverCoast Fork River

Page E-49

CAR_H = CAR_A

TRB_A – CAR_H = TRB_L

CAR_A + TRB_L = TRB_ARF

TRB_H = TRB_A

CGR_H + CGR_S = CGR_A

BLU_H + BLU_S = BLU_A

Page E-50

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramMcKenzie River

CAR_A

Continue page E-53

Carmen Diversion Dam

Continue page E-53

CAR_H

TRB_A

TRB_L TRB_ARF

TRB_HTrail Bridge Dam

CGR_A

CGR_S

CGR_HCougar Dam

BLU_A

BLU_S

BLU_H Blue River Dam

McKenzie River McKenzie River

Page E-51

LEA_A – [(CAR_H + TRB_H + CGR_H + BLU_H) routed to LEA] = LEA_L

[(TRB_ARF + CGR_A + BLU_A) routed to LEA] + LEA_L = LEA_ARF

LEA_H = LEA_A

WAV_A – LEA_H = WAV_L

LEA_ARF + WAV_L = WAV_ARF

WAV_H = WAV_A

Page E-52

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramMcKenzie River

LEA_A

Continue page E-55

Leaburg Dam

Continue page E-55

LEA_H

WAV_A

WAV_L WAV_ARF

WAV_H Walterville Dam

From page E-51

LEA_L

From page E-51

LEA_ARF

McKenzie River McKenzie River

Page E-53

FRN_S + FRN_H = FRN_A

Page E-54

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramWillamette/Long Tom River

FRN_A

FRN_S

FRN_H

Continue page E-57

Fern Ridge Dam

Continue page E-57

Page E-55

ALB_H – [(LOP_H + FAL_H + COT_H + DOR_H + WAV_H + FRN_H) routed to ALB] = ALB_L

[(LOP_ARF + FAL_A + COT_A + DOR_A + WAV_ARF + FRN_A) routed to ALB] + ALB_L = ALB_ARF

Page E-56

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramWillamette River

ALB_H

ALB_L ALB_ARF

From page E-55 From page E-55

Continue page E-61 Continue page E-61

Page E-57

GPR_H + GPR_S = GPR_A

FOS_A – GPR_H = FOS_L

GPR_A + FOS_L = FOS_ARF

FOS_H + FOS_S = FOS_A

DET_H + (DET_S + BCL_S) = DET_A

Page E-58

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramSantiam River

GPR_A

GPR_S

GPR_H

Santiam River

Green Peter Dam

Continue page E-61

FOS_A

FOS_S

FOS_H

FOS_L FOS_ARF

Foster Dam

DET_A

DET_S + BCL_S

DET_H Detroit Dam

Continue page E-61

Santiam River

Page E-59

SLM_H – [(ALB_H + FOS_H + DET_H) routed to SLM] = SLM_L

[(ALB_ARF + FOS_ARF + DET_A) routed to SLM] + SLM_L = SLM_ARF

SVN_H – (SLM_H routed to SVN) = SVN_L

(SLM_ARF routed to SVN) + SVN_L = SVN_ARF

Page E-60

Streamflow/Storage Data Input and SSARR Routing

LegendCalculation Direction

Reservoir Inflow (A)

Reservoir

Storage (S)or

Initial Fill (F)

Outflow

Routed Flow (rt)

Local Flow (L)

Adjusted Routed Flow (ARF)

Control Point

Summation Point

Storage (S)or

Initial Fill (F)

Outflow

Run of RiverReservoir

Run of RiverReservoir

SSARR Routing DiagramWillamette River

SLM_H

SLM_L SLM_ARF

From page E-57 From page E-57

SVN_H

SVN_L SVN_ARF

End

End

Page E-61

This page is intentionally left blank

Appendix F – Routing Characteristics The routing characteristics for calculating routed flows and local flows as described in Section 2 are shown in the following tables.

Page F-1

Table F and Table F-2 contain the values of the required characteristics for a specified channel flow for each of the Columbia River Basin reaches. The discharge value shown was selected for illustrative purposes only. This value changes daily. Channel routing using a defined specific discharge (Q) to time of storage (Ts) relationship was used for specific reaches (Table F-3 to Table F-12).

Page F-2

Table F-1. Coefficients for Computing Routed flows (ARF) Basin Routing Reach KTS n Phases Assume Q Phase Ts Total Ts

MCD to RVC 5.0 0.2 3.0 20000 0.7 2.1RVC to ARD 10.0 0.2 2.0 20000 1.4 2.8

LIB to BFE (1928-1999) 30.0 0.2 4.0 20000 4.1 16.6LIB to LEO (1999-2008)LEO to BFE (1999-2008) 8.0 0.2 3.0 20000 1.1 3.3

BFE to COR 10.0 0.2 4.0 20000 1.4 5.5COR to BRI

ARD + BRI to MUC 10.0 0.2 4.0 20000 1.4 5.5MUC to CIB 10.0 0.2 2.0 20000 1.4 2.8HGH to CFM 26.0 0.2 4.0 20000 3.6 14.3CFM to KER 26.0 0.2 4.0 20000 3.6 14.3KER to TOM 28.6 0.2 5.0 20000 3.9 19.7TOM to NOX 9.0 0.2 2.0 20000 1.2 2.5NOX to CAB 6.0 0.2 2.0 20000 0.8 1.7

CAB+PSL to CAB 10.0 0.2 2.0 20000 1.4 2.8ALF to BOX 30.0 0.2 4.0 20000 4.1 16.6BOX to BDY 10.0 0.2 4.0 20000 1.4 5.5

BDY to SEV/WATSEV/WAT to CIB

COE to UPF 10.0 0.2 5.0 15000 1.5 7.3UPF to NIN 6.0 0.2 5.0 15000 0.9 4.4NIN to LLK 7.0 0.2 5.0 15000 1.0 5.1

CIB+WAT+LLK to GCL 30.0 0.2 2.0 55000 3.4 6.8GCL to CHJ 6.0 0.2 2.0 55000 0.7 1.4CHJ to WEL 5.0 0.2 2.0 55000 0.6 1.1WEL to RRH 8.0 0.2 2.0 55000 0.9 1.8RRH to RIS 5.0 0.2 2.0 55000 0.6 1.1RIS to WAN 7.0 0.2 2.0 55000 0.8 1.6WAN to PRD 5.0 0.2 2.0 55000 0.6 1.1PRD to RICH 25.0 0.2 5.0 55000 2.8 14.1YAK to RICH 6.3 0.1 2.0 5000 1.1 2.3BRN to HCD 2.5 0.2 5.0 25000 0.3 1.6HCD to LIM 1.1 0.2 20.0 25000 0.1 2.9WHB to LIM 17.5 0.2 5.0 25000 2.3 11.5LIM to ANA

DWR+ORO to SPD 7.0 0.2 5.0 10000 1.1 5.5ANA+SPD to LWG 7.5 0.2 10.0 35000 0.9 9.3

LWG to LGS 4.0 0.2 4.0 50000 0.5 1.8LGS to LMN 4.0 0.2 4.0 50000 0.5 1.8LMN to IHR 5.0 0.2 4.0 50000 0.6 2.3

IHR to PASCORICH+PAS to MCN (1928-1949)RICH+PAS to MCN (1950-1953)

RICH+PAS to MCN (1954-present) 15.0 0.2 3.0 110000 1.5 4.4MCN to JDA (1950-1968)

MCN to JDA (rest of record) 5.0 0.2 5.0 110000 0.5 2.5JDA to TDA 7.0 0.2 3.0 110000 0.7 2.1TDA to BONHCR to LOP 1.5 0.1 2.0 5000 0.3 0.5LOP to DEX

FAL+DEX to JAS 3.0 0.2 5.0 5000 0.5 2.7COT+DOR to GOS 10.0 0.2 4.0 5000 1.8 7.3GOS+JAS to EUG 3.0 0.2 5.0 5000 0.5 2.7CGR+BLU to VID 4.0 0.1 2.0 5000 0.7 1.5

VID+EUG TO HARFRN to MNR 5.0 0.2 5.0 5000 0.9 4.6

HAR+MNR TO CORCOR to ALBDET to MEH 4.0 0.2 5.0 10000 0.6 3.2

MEH TO JEFF 7.0 0.2 5.0 20000 1.0 4.8FOS to WTL 3.5 0.2 5.0 10000 0.6 2.8WTL to JEFF 5.0 0.2 5.0 25000 0.7 3.3

ALB+JEF TO SLMSLM to SVNSVN to PDX 6.0 0.1 2.0 25000 0.8 1.6

No routing in this reach

No routing in this reach

Sp

oka

neS

nake

Low

er

Co

lum

bia

No routing in this reach

Up

per

Col

um

bia

&

Koo

ten

aiP

end

O'R

eille

See Table F-7

See Table F-6

See Table F-5See Table F-4

See Table F-3

No routing in this reach

No routing in this reach

Will

ame

tte

See Table F-8

See Table F-9See Table F-10

See Table F-11See Table F-12

No routing in this reach

Mid

Col

um

bia

&

Yak

ima

Page F-3

Table F-2. Coefficients for Computing Local Flows (L) Basin Routing Reach KTS n Phases Assume Q Phase Ts Total Ts

MCD to RVC (07/1928-03/1973) 12.5 0.2 6.0 20000 1.7 10.3MCD to RVC (04/1973-10/1973) 20.0 0.2 6.0 20000 2.8 16.6MCD to RVC (11/1973-present) 5.0 0.2 3.0 20000 0.7 2.1

RVC to ARD (1928-06/1968) 35.0 0.2 3.0 20000 4.8 14.5RVC to ARD (07/1968 - present) 10.0 0.2 2.0 20000 1.4 2.8

LIB to BFE 30.0 0.2 4.0 20000 4.1 16.6LIB to LEO (1999-2008)LEO to BFE (1999-2008) 8.0 0.2 3.0 20000 1.1 3.3

BFE to COR 20.0 0.2 4.0 20000 2.8 11.0COR to BRI

ARD + BRI to MUC 10.0 0.2 2.0 20000 1.4 2.8BIR to CIB 10.0 0.2 2.0 20000 1.4 2.8

MUC to CIB 10.0 0.2 2.0 20000 1.4 2.8HGH to CFM 26.0 0.2 4.0 20000 3.6 14.3CFM to KER 26.0 0.2 4.0 20000 3.6 14.3KER to TOM 28.6 0.2 5.0 20000 3.9 19.7TOM to NOX 9.0 0.2 2.0 20000 1.2 2.5NOX to CAB 6.0 0.2 2.0 20000 0.8 1.7

CAB+PSL to CAB 10.0 0.2 2.0 20000 1.4 2.8ALF to BOX 30.0 0.2 4.0 20000 4.1 16.6BOX to BDY 10.0 0.2 4.0 20000 1.4 5.5

BDY to SEV/WATSEV/WAT to CIB

COE to UPF 10.0 0.2 5.0 15000 1.5 7.3UPF to NIN 6.0 0.2 5.0 15000 0.9 4.4NIN to LLK 7.0 0.2 5.0 15000 1.0 5.1

CIB+WAT+LLK to GCL 30.0 0.2 2.0 55000 3.4 6.8GCL to CHJ 6.0 0.2 2.0 55000 0.7 1.4CHJ to WEL 5.0 0.2 2.0 55000 0.6 1.1WEL to RRH 8.0 0.2 2.0 55000 0.9 1.8RRH to RIS 5.0 0.2 2.0 55000 0.6 1.1RIS to WAN 7.0 0.2 2.0 55000 0.8 1.6WAN to PRD 5.0 0.2 2.0 55000 0.6 1.1PRD to RICH 25.0 0.2 5.0 55000 2.8 14.1YAK to RICH 6.3 0.1 2.0 5000 1.1 2.3BRN to HCD 2.5 0.2 5.0 25000 0.3 1.6HCD to LIM 1.1 0.2 20.0 25000 0.1 2.9WHB to LIM 17.5 0.2 5.0 25000 2.3 11.5LIM to ANA

DWR+ORO to SPD 7.0 0.2 5.0 10000 1.1 5.5ANA+SPD to LWG (1928-1935) 13.5 0.2 10.0 35000 1.7 16.7

ANA+SPD to LWG (1936-present) 7.5 0.2 10.0 35000 0.9 9.3LWG to LGS 4.0 0.2 4.0 50000 0.5 1.8LGS to LMN 4.0 0.2 4.0 50000 0.5 1.8LMN to IHR 5.0 0.2 4.0 50000 0.6 2.3

IHR to PASCORICH+PAS to MCN (1928-1949)RICH+PAS to MCN (1950-1953)

RICH+PAS to MCN (1954-present) 15.0 0.2 7.0 110000 1.5 10.3MCN to JDA (1950-1968)

MCN to JDA (rest of record) 5.0 0.2 5.0 110000 0.5 2.5JDA to TDATDA to BONHCR to LOP 1.5 0.1 2.0 5000 0.3 0.5LOP to DEX

FAL+DEX to JAS 3.0 0.2 5.0 5000 0.5 2.7COT+DOR to GOS 10.0 0.2 4.0 5000 1.8 7.3GOS+JAS to EUG 3.0 0.2 5.0 5000 0.5 2.7CGR+BLU to VID 4.0 0.1 2.0 5000 0.7 1.5

VID+EUG TO HARFRN to MNR 5.0 0.2 5.0 5000 0.9 4.6

HAR+MNR TO CORCOR to ALBDET to MEH 4.0 0.2 5.0 10000 0.6 3.2

MEH TO JEFF 7.0 0.2 5.0 20000 1.0 4.8FOS to WTL 3.5 0.2 5.0 10000 0.6 2.8WTL to JEFF 5.0 0.2 5.0 25000 0.7 3.3

ALB+JEF TO SLMSLM to SVNSVN to PDX 6.0 0.1 2.0 25000 0.8 1.6

Up

pe

r C

olu

mb

ia &

Ko

ote

na

iP

en

d O

'Re

ille

Spo

kan

e

See Table F-3

Mid

Co

lum

bia

&

Ya

kim

aS

na

keL

ow

er

Co

lum

bia

Will

amet

te

See Table F-10

See Table F-11

See Table F-4See Table F-5

See Table F-6

See Table F-7

See Table F-12

No routing in this reach

No routing in this reachNo routing in this reach

No routing in this reach

No routing in this reach

No routing in this reach

No routing in this reach

See Table F-8

See Table F-9

Page F-4

Table F-3. Libby routed to Leonia, WY1999-2008 n = 0, no. phase = 30

Discharge Ts(cfs) (hours)

1 0.66000 0.49000 0.2

20000 0.3100000 0.3200000 0.4

9999999 0.4 Table F-4. Richmond + Pasco routed to McNary, WY1928-1949 n = 0, no. phase = 7

Discharge Ts(cfs) (hours)

1 7540000 60

100000 55450000 55550000 45750000 25800000 30

1000000 401250000 501750000 653000000 100

Table F-5. Richmond + Pasco routed to McNary, WY1950-1953 n = 0, no. phase = 7

Discharge Ts(cfs) (hours)

1 3540000 30

100000 25450000 20550000 15750000 10800000 15

1000000 201250000 251750000 303000000 40

Page F-5

Table F-6. McNary routed to John Day, WY1950-1968 n = 0, no. phase = 6

Discharge Ts(cfs) (hours)

1 4540000 40

100000 35450000 30550000 20750000 15800000 25

1000000 301250000 351750000 403000000 50

Table F-7. The Dalles routed to Bonneville, 7/1928 - Present n = 0, no. phase = 5

Discharge Ts(cfs) (hours)

1000 65000 6

10000 620000 550000 5

100000 4500000 3

9999999 3 Table F-8. Vida+Eugene routed to Harrisburg, 7/1928 - Present n = 0, no. phase = 7

Discharge Ts(cfs) (hours)

1 2.31000 1.4

20000 0.5730000 0.5740000 0.7150000 0.8960000 1.1480000 1.14

140000 0.83180000 0.71

Page F-6

Table F-9. Harrisburg+Monroe routed to Corvalis, 7/1928 - Present n = 0, no. phase = 6

Discharge Ts(cfs) (hours)

1 41000 3.33

10000 2.1620000 1.8330000 1.8340000 2.0850000 2.6760000 3.3470000 3.6680000 3.58

100000 3.16120000 2.8180000 1.83

Table F-10. Corvalis routed to Albany, 7/1928 - Present n = 0, no. phase = 5

Discharge Ts(cfs) (hours)

1 2.941000 2.43000 1.96

10000 1.420000 0.830000 0.640000 0.5250000 0.5260000 0.680000 0.7

100000 0.85120000 1150000 1.2200000 1.4300000 1.3400000 1.12500000 1

Page F-7

Page F-8

Table F-11. Albany+Jefferson routed to Salem, 7/1928 - Present n = 0, no. phase = 6

Discharge Ts(cfs) (hours)

1000 3.3310000 2.6720000 2.1730000 1.5840000 1.4250000 1.1760000 1.2880000 1.42

100000 2.26120000 2.75140000 3170000 3.08200000 2.84250000 2.16300000 1.83400000 1.75500000 1.66

Table F-12. Salem routed to T.S Sullivan, 7/1928 - Present n = 0, no. phase = 2

Discharge Ts(cfs) (hours)

1 0.450000 0.48

100000 0.71150000 1.12200000 1.54250000 1.85300000 2.1350000 2.31400000 2.5500000 2.65

Non-modified flows abbreviations: RICH = Richmond PAS = Pasco JAS = Jasper GOS = Goshen MEH = Mehama WTL = Waterloo

Appendix G – Storage/Elevation Tables

G.1 Pend Oreille and Spokane Hungry Horse ReservoirNote = The tables shown are for 0% bank storageDate of Table = 10/19/1953 Date of Table = UnknownDates of use = Until 9/1999, except initial fill Dates of use = WY 2000 - 2008

ELEVATION STORAGE ELEVATION STORAGE ELEVATION STORAGE ELEVATION STORAGE(FT) (AF) (FT) (AF) (FT) (AF) (FT) (AF)

3360 590000 3336.0 0 3414.2 594160 3492.4 16105013369 653000 3338.3 12661 3416.5 617211 3494.7 16486113379 728000 3340.6 25501 3418.8 640519 3497.0 16878133386 784000 3342.9 38701 3421.1 664082 3499.3 17276473394 852000 3345.2 52056 3423.4 688210 3501.6 17679953402 924000 3347.5 65802 3425.7 712472 3503.9 18093353407 971000 3349.8 79758 3428.0 737291 3506.2 18509493412 1018000 3352.1 93919 3430.3 762377 3508.5 18935243419 1088000 3354.4 108467 3432.6 787713 3510.8 19364823425 1151000 3356.7 123141 3434.9 813645 3513.1 19797973434 1249000 3359.0 138205 3437.2 839744 3515.4 20240193440 1318000 3361.3 153506 3439.5 866460 3517.7 20683483449 1426000 3363.6 169054 3441.8 893437 3520.0 21135593457 1527000 3365.9 185075 3444.1 920670 3522.3 21591073466 1650000 3368.2 201310 3446.4 948523 3524.6 22049593475 1781000 3370.5 218027 3448.7 976511 3526.9 22517203484 1921000 3372.8 234981 3451.0 1005146 3529.2 22986063490 2017000 3375.1 252156 3453.3 1034093 3531.5 23464373494 2083000 3377.4 269780 3455.6 1063330 3533.8 23945973500 2185000 3379.7 287548 3457.9 1093277 3536.1 24430993507 2311000 3382.0 305795 3460.2 1123504 3538.4 24925953518 2520000 3384.3 324340 3462.5 1154652 3540.7 25422033528 2720000 3386.6 343173 3464.8 1186444 3543.0 25927823538 2930000 3388.9 362535 3467.1 1218940 3545.3 26437043541 2996000 3391.2 382078 3469.4 1252530 3547.6 26949313542 3017000 3393.5 402094 3471.7 1286457 3549.9 27471373547 3127000 3395.8 422297 3474.0 1321157 3552.2 27994463554 3288000 3398.1 442679 3476.3 1356104 3554.5 28527923561 3452000 3400.4 463519 3478.6 1391231 3556.8 29064733565 3548000 3402.7 484460 3480.9 1427006 3559.1 2960450

3405.0 505869 3483.2 1462822 3561.4 30153473407.3 527493 3485.5 1499265 3563.7 30700893409.6 549324 3487.8 1535878 3565.0 31016303411.9 571664 3490.1 1572744

Page G-1

Flathead Lake at Somers

Date of Table = 10/12/1943Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2881 3385002882 4549002883 5723002884 6907002885 8101002886 9303002887 10510002888 11720002889 12940002890 14170002892 16650002894 19170002895 20450002896 21740002897 23040002899 25660002900 2699000

Page G-2

Noxon Rapids

Date of Table = 6/30/1960Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2270.1 3572273 107112277 257852281 416532285 583142288 714052292 896532295 1039342298 1188102301 1342812302 1396362304 1507442306 1622482308 1741492310 1864462312 1991412315 2187772318 2390082321 2598352323 2741162326 2961322328 3112072330 3266782331 334612

Priest Lake at Outlet, near Coolin, ID

Date of Table = 6/23/1958Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2433.94 318602434.94 553602436.14 836802437.24 1097502438.34 1359302439.14 1550502440.24 1814502440.94 1983202441.64 215260

2442 224008

Page G-3

Pend Oreille Lake

Date of Table = 2/2/1954Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2044.9 79002045.6 632002045.8 792002046.9 1694002047.3 2026002048.2 2782002049.2 3632002050.4 4664002051.8 5882002053.3 720200

2055 8715002056.6 10155002058.2 11611002059.6 1289900

2061 14201002062.3 15423002063.4 16468002064.6 17620002065.7 18687002066.7 19667002067.7 20657002068.9 21857002070.1 23069002071.4 2439500

2073 26043002074.8 2791500

2077 30225002079 3234500

2079.8 3320100

Page G-4

Lake Koocanusa at Libby Dam

Date of Table = 3/1/1980Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2200 1146692210 1623512220 2193332230 2845872240 3597882250 4485542260 5512162270 6664432280 7931242290 9342492300 10946282310 12713542320 14596612330 16621872340 18800982350 21103602360 23534302370 26117372380 28859752390 31757162400 34882662410 38326632420 42062502430 46027342440 50205072450 54586542460 5915939

Page G-5

Kootenay Lake

Date of Table = 2/16/1953 Date of Table = 3/24/1969Dates of use = WY 1928 - 1968 Dates of use = WY 1969 - 2008

ELEVATION STORAGE ELEVATION STORAGE ELEVATION STORAGE (FT) (AF) (FT) (AF) (FT) (AF)

1734 0 1746.5 1256200 1738 0.011736 130000 1746.7 1279800 1740 2100801738 300000 1746.8 1291700 1741 316080

1738.2 321800 1746.9 1303500 1742 4227601738.3 332800 1747.9 1422500 1743 5306001738.5 354600 1748 1434500 1744 6402301738.6 365600 1748.1 1446400 1745.3 7849831738.8 387400 1748.4 1482400 1746 8636401738.9 398400 1748.5 1494300 1747 976860

1739 409300 1749.1 1566300 1748 10909601739.1 420300 1749.2 1578400 1749 12060001739.2 431200 1749.4 1602400 1750 13220201739.4 453200 1749.5 1614500 1751 14391801739.5 464100 1749.6 1626500 1752 15576601739.7 486100 1749.7 1638600 1753 16776001739.8 497000 1749.8 1650600 1754 17991501739.9 508000 1750.5 1735300 1755 1922070

1740 518900 1751.3 1832900 1756 20461301741.1 639900 1752 1919000 1757 21712401741.2 651000 1753 2043000 1758 22973201741.3 662000 1753.4 2093000 1759 24244001741.5 684200 1754 2168600 1760 25525001741.6 695200 1754.5 2232100 1770 38746001742.2 761800 1755 22961001742.3 773000 1755.6 23735001742.4 784100 1756 2425500

1743 851300 1756.9 25434001743.5 907800 1757.1 25698001743.6 919200 1757.2 25829001743.8 941800 1758.5 2754500

1744 964600 1760.5 30205001744.5 1022100 1762.6 33019001744.6 1033700 1763.1 33694001744.8 1056700 1763.2 3382800

1745 1079900 1763.3 33963001745.7 1161800 1763.4 34097001745.8 1173600 1763.5 34232001745.9 1185300 1763.6 34366001746.4 1244300 1765.4 3679600

Page G-6

Couer d'Alene

Date of Table = 9/29/1936Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2120.5 134002121.4 375002123.2 86100

2124 1079002125 1352002126 162900

2126.6 1811002127.4 2111002127.6 219800

2128 2385002128.4 2579002128.8 2779002129.4 3085002130.2 3501002131.5 4190002133.5 5270002133.9 5490002134.1 5598002135.3 6258002135.5 636900

2136 6644002136.5 6921002137.3 7365002138.6 8093002138.9 8264002139.1 837700

2140 8890002141 9470002142 10060002146 1246000

Page G-7

Long Lake

Date of Table = 9/7/1961Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1512.1 3601514 72001517 186001518 225001519 265001521 347001522 389001524 475001526 563001529 701001530 748001532 844001534 942001536 1042001537 109300

Page G-8

G.2 Mid-Columbia FDR Lake at Grand Coulee Dam

Date of Table = Unknown Date of Table = 1/21/1953Dates of use = WY 1938-1952 Dates of use = WY 1953-1974Source = "GCLOLD.CAP" Source = "FDROLD.CAP"

ELEVATION STORAGE ELEVATION STORAGE ELEVATION STORAGE(FT) (AF) (FT) (AF) (FT) (AF)

957 18000 1208 4330000 1250 6663200975 54000 1209 4376700 1251 6728000988 93000 1210 4423800 1252 6793300

1004 157000 1211 4471300 1253 68589001016 217000 1212 4519200 1254 69248001030 301000 1213 4567500 1255 69910001040 371000 1214 4616200 1256 70576001050 451000 1215 4665300 1257 71246001060 541000 1216 4714800 1258 71919001070 641000 1217 4764800 1259 72595001080 761000 1218 4815200 1260 73275001090 901000 1219 4866000 1261 73959001100 1051000 1220 4917200 1262 74648001110 1221000 1221 4968800 1263 75341001120 1401000 1222 5020900 1264 76038001127 1541000 1223 5073300 1265 76739001130 1607300 1224 5126100 1266 77445001140 18473000 1225 5179400 1267 78155001143 19313000 1226 5233000 1268 78869001156 2321300 1227 5287000 1269 79586001162 2513300 1228 5341300 1270 80307001163 2547300 1229 5396100 1271 81032001164 2581400 1230 5451200 1272 81761001168 2729000 1231 5506700 1273 82495001170 2803000 1232 5562700 1274 83232001180 3193000 1233 5619100 1275 83974001190 3593000 1234 5676200 1276 84720001200 4003000 1235 5734000 1277 85471001208 4371000 1236 5792600 1278 86228001230 5493000 1237 5852000 1279 86989001270 8093000 1238 5911900 1280 87754001278 8693000 1239 5972400 1281 88523001280 8850000 1240 6033400 1282 89296001285 9240000 1241 6094700 1283 90073001291 9738000 1242 6156500 1284 9085400

1243 6218600 1285 91639001244 6281000 1286 92428001245 6343800 1287 93220001246 6407000 1288 94017001247 6470500 1289 94817001248 6534400 1291 96423001249 6598600

Page G-9

FDR Lake at Grand Coulee Dam - continued

Date of Table = 1/24/1975 Date of Table = 1968, 1975, 1978Dates of use = WY 1975-1999 Dates of use = WY 2000-2008Source = "FDR.CAP" Source = "GCL.CAP" This table obtained in 2009 from BoR,

but actually created in 1968, approved in 1974, and stamped in 1977.ELEVATION STORAGE ELEVATION STORAGE ELEVATION STORAGE

(FT) (AF) (FT) (AF) (FT) (AF) 930.5 0 1208 0 1250 2292398

980 76367 1209 45753 1251 23565811000 146966 1210 91828 1252 24211931020 249373 1211 138254 1253 24862351060 553243 1212 185068 1254 25517101120 1403168 1213 232270 1255 26176171170 2713909 1214 279861 1256 26839591180 3063165 1215 327844 1257 27507361190 3442953 1216 376221 1258 28179521200 3854634 1217 424992 1259 28856061210 4301035 1218 474159 1260 29537001220 4782896 1219 523724 1261 30221651230 5308657 1220 573690 1262 30909961240 5882754 1221 624091 1263 31601921250 6501603 1222 674969 1264 32297541260 7162905 1223 726326 1265 32996831270 7864082 1224 778166 1266 33699811280 8603683 1225 830490 1267 34406491291 9477261 1226 883300 1268 3511687

1227 936599 1269 35830961228 990389 1270 36548771229 1044673 1271 37270611230 1099450 1272 37996371231 1154719 1273 38726061232 1210458 1274 39459691233 1266670 1275 40197271234 1323356 1276 40938811235 1380518 1277 41684321236 1438159 1278 42433811237 1496280 1279 43187291238 1554884 1280 43944791239 1613972 1281 44707471240 1673549 1282 45476371241 1733575 1283 46251521242 1794011 1284 47032941243 1854857 1285 47820651244 1916116 1286 48614691245 1977788 1287 49415071246 2039874 1288 50221831247 2102378 1289 51034981248 2165298 1290 51854551249 2228638

Page G-10

Chief Joseph

Date of Table = 1/10/1955Dates of use = WY 1960 - 2008

ELEVATION STORAGE (FT) (AF)

930 400800932 414600934 428600936 442800938 457200941 479100944 501300947 523800950 546600953 569700956 593100959 616800960 624800

Wells

Date of Table = UnknownDates of use = WY 2000 - 2008Source = USACE mcol.dss

ELEVATION STORAGE (FT) (AF)

767 210000769 223200771 236600773 252890775 269900777 288800779 308900781 331700

Page G-11

Lake Chelan

Date of Table = 10/1/1927Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1079.1 31401080 314001081 629001082 94500

1083.5 1420501085 1897501088 2857501090 3501501093 4473501097 577750

1097.3 5875601100 676120

Rocky Reach

Date of Table = UnknownDates of use = WY 2000 - 2008Source = USACE mcol.dss

ELEVATION STORAGE (FT) (AF)

592 0600 2000608 5000624 13000634 23000638 29000646 45000650 55000656 67000664 103000672 139000676 159000682 192000688 228000692 254000696 283000700 317000703 344000704 353000706 372000707 382000710 412000

Page G-12

Rock Island

Date of Table = Unknown Date of Table = UnknownDates of use = 07/1960 - 09/1999 Dates of use = 10/1999 - 09/2008

Source = Chelan PUD; obtained in 2009ELEVATION STORAGE ELEVATION STORAGE

(FT) (AF) (FT) (AF) 603 0 609 0615 29400 610 2900

611 5800612 8700613 11700

Wanapum

Date of Table = UnknownDates of use = WY 2000 - 2008Source = USACE mcol.dss

ELEVATION STORAGE (FT) (AF)

500 28500510 65000520 122500530 200000540 294000550 403500559 518000562 558500565 600500569 658500578 793500

Page G-13

Priest Rapids

Date of Table = UnknownDates of use = WY 2000 - 2008Source = USACE mcol.dss

ELEVATION STORAGE (FT) (AF)

430 7200440 23900450 49500460 81300470 121300480 171400481 177100483 189100485 201900487 215500489 229900490 237700500 337700

Page G-14

G.3 Lower Snake

Page G-15

Brownlee

Date of Table = Unknown Date of Table = 1/1/1984Dates of use = WY 1958 - 83 Dates of use = WY 1984 - 2008Source = BRNOLD Source = BRN.CAP

ELEVATION STORAGE ELEVATION STORAGE (FT) (AF) (FT) (AF)

1840 13727.38 1801 01977 453025 1820 24851978 459769 1840 137271979 466711 1860 336771980 473655 1880 659181991 552195 1900 1121221999 610915 1920 1717312000 618445 1940 2487942002 633515 1960 3483262004 648985 1980 4709712006 664845 2000 6156932008 681105 2020 7832022010 697765 2040 9737682013 723355 2060 11944492015 740815 2080 14646672017 7586752019 7769152025 8328352033 9089952034 9187252041 9867652043 10066052044 10167252046 10373252048 10584252049 10691252051 10909252052 11020252053 11133252054 11248252055 11365252056 11484252058 11726252059 11851252060 11978252063 12365252064 12495252067 12894252070 13299252072 13573252075 13987252077 14265252079 1454525

Page G-16

Dworshak

Date of Table = 5/1/1981Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1443.1 14351171445 14522441480 17820061520 22380201560 27940221600 3467928

Lower Granite

Date of Table = UnknownDates of use = WY 2000 - 2008Source = lsnk.dss

ELEVATION STORAGE (FT) (AF)

623 0630 20000640 40000660 79000681 138000685 153000690 174000695 198000700 222000710 279000720 346000724 376000733 440200738 483800740 503000

Page G-17

Little Goose

Date of Table = UnknownDates of use = WY 2000 - 2008Source = lsnk.dss

ELEVATION STORAGE (FT) (AF)

524 0530 15000540 30000570 77000581 123900585 146000590 175300595 210000600 234700610 316600620 398500624 435000633 517200638 565000640 585000

Lower Monumental

Date of Table = UnknownDates of use = WY 2000 - 2008Source = lsnk.dss

ELEVATION STORAGE (FT) (AF)

432 0435 6500440 20000470 66500483 108500487 120000492 137000497 155000502 175000512 223000522 275000526 297000535 335000538 350000540 361000

Page G-18

Ice Harbor

Date of Table = UnknownDates of use = WY 2000 - 2008Source = lsnk.dss

ELEVATION STORAGE (FT) (AF)

340 5000380 51000391 82000395 107200400 125000405 147000410 175000415 205000425 275000436 375040438 395000441 415540

Page G-19

G.4 Lower Columbia McNary

Date of Table = UnknownDates of use = WY 2000 - 2008Source = lcol.dss

ELEVATION STORAGE (FT) (AF)

250 6000260 26000270 52000280 108000290 220000293 263000300 361000310 540000320 865000330 1010000335 1181600340 1356600341 1405000

John Day

Date of Table = Unknown Date of Table = UnknownDates of use = N/A Dates of use = N/A

ELEVATION STORAGE ELEVATION STORAG(FT) (AF) (FT) (AF)

257 1990000 257 1989900258 2032000 258 2031800259 2077000 260 2123500260 2123000 262 2218600261 2170000 264 2316900262 2218000 266 2420400263 2267000 268 2523900265 2367000 269 2575600266 2418000 270 2635000267 2471000 272 2745000268 2525000 274 2860000269 2580000 276 2975000

E

Page G-20

Round Butte

Date of Table = 1/19/1964Dates of use = WY 1978 - 2008

ELEVATION STORAGE (FT) (AF)

1860 2607941870 2866731880 3141081890 3432181900 3740041910 4066131920 4410541930 4772611940 5152761945 5347391950 555131

The Dalles

Date of Table = UnknownDates of use = WY 2000 - 2008

ELEVATION STORAGE (FT) (AF)

121 20000130 67000135 103500140 140000142 158000144 176000146 194200148 212600150 231000152 249400154 267800156 287600158 308800160 330000161 340600162 354000164 375000166 400000

Page G-21

Bonneville

Date of Table = Unknown Date of Table = 02/1962Dates of use = 07/1960 - 09/1999 Dates of use = WY 2000 - 2008

ELEVATION STORAGE ELEVATION STORAGE (FT) (AF) (FT) (AF)

45 0 45 050 68000 50 6750055 151000 55 14900060 241000 60 24000065 343000 65 34200070 450000 70 44700075 555000 74 53400085 768000 75 554000

77 59600080 66100081 68200082 703000

82.5 713000

Page G-22

G.5 Willamette Hills Creek Lake

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1260 1751280 21941300 76161320 171781340 306511360 470791380 665581400 891411420 1145891440 1430431460 1749181480 2109701500 2518671520 2972231540 3473381560 414079

Page G-23

Dexter Lake

Date of Table = 1/24/1988Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

640 36650 903660 3,309670 7,775671 8,343672 8,917673 9,499674 10,100675 10,700676 11,300677 11,900678 12,600679 13,300680 14,000681 14,800682 15,500683 16,300684 17,200685 18,000686 18,900687 19,800688 20,700689 21,600690 22,500691 23,400692 24,400693 25,400694 26,300695 27,300696 28,300697 29,300698 30,300699 31,400700 32,400

Page G-24

Lookout Point Lake

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

700 198720 3861740 11032760 23765780 44095800 72535820 108573840 152466860 205471880 267848900 338887920 417829940 504528

Fall Creek Lake

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

680 93690 814700 2046710 3921720 6617730 10586740 16283750 22728760 29816770 37985780 47682790 58692800 71007810 85120820 100789830 117826840 136779

Page G-25

Cottage Grove Reservoir

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

720 3725 44730 150735 399740 925745 1843750 3139755 4865760 7153765 9973770 13255775 17074780 21463785 26371790 31784795 37690800 44039805 50806

Dorena Reservoir

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

740 35750 712760 2809770 6835780 12526790 19585800 28490810 39381820 52476830 68473840 87315850 108342860 131059

Page G-26

Cougar Reservoir

Date of Table = 1/1/1968 Date of Table = 2/26/2002Dates of use = 09-1963 to 01-2002 Dates of use = 02-2002 to 09-2008

Source = USACE IntranetELEVATION STORAGE ELEVATION STORAGE

(FT) (AF) (FT) (AF) 1280 8 1300 01300 219 1320 811320 796 1340 5001340 1855 1360 14801360 3532 1380 34201380 6065 1399 59281400 9633 1401 62011420 14194 1420 95201440 19766 1440 143001460 26948 1460 201001480 35841 1480 272001500 45660 1500 357001520 56580 1520 456001540 69111 1540 565001560 83047 1560 686001580 98223 1580 823001600 114748 1600 978001620 132684 1620 1151001640 152060 1640 1340001660 172984 1660 1547001680 195678 1680 1771001700 220361 1699 200000

Page G-27

Blue River Reservoir

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1120 1561140 7631160 18741180 39711200 70311220 110391240 161781260 227691280 315451300 430951320 572401340 737061350 828201357 895221360 924621362 944471380 1133141400 136306

Fern Ridge Reservoir

Date of Table = 1/1/1968 Date of Table = Nov-05Dates of use = 10-1974 to 10-2005 Dates of use = 11-2005 to 09-2008

Source = USACE IntranetELEVATION STORAGE ELEVATION STORAGE

(FT) (AF) (FT) (AF) 345 318 339 0350 3252 353 7000355 10501 355 10300360 22667 358.5 18300365 42009 360 22600370 71900 365 41800375 115761 370 72000

373.5 101200374.5 110800379.5 177000

Page G-28

Detroit Lake

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1200 61220 1971240 7101260 19971280 49361300 103411320 184721340 292381360 434691380 615461400 829321420 1080271440 1376791460 1722241480 2109391500 2545931520 3043631540 3602451560 4239641565 4411961569 4551041575 476174

Page G-29

Green Peter Reservoir

Date of Table = 1/1/1968Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

730 237740 508750 987760 1780770 3016780 4930790 7789800 11750810 16889820 23229830 30795840 39638850 49683860 60877870 73273880 86917890 101888900 118282910 136202920 155746930 176965940 199885950 224580960 251124970 279569980 309742990 341465

1000 3747621010 4098331020 446904

Page G-30

Foster Reservoir

Date of Table = 5/20/1980Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

530 16540 295550 1068560 2441570 4663580 8172590 13396600 20305610 28429620 37570630 47858640 59531650 73099

Page G-31

G.6 Western Washington Packwood Lake

Date of Table = UnknownDates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

2843.5 02860 6981

Page G-32

Riffle Lake nr Mossylake, Wa

Date of Table = UnknownDates of use = WY 1929 - 1999

ELEVATION STORAGE (FT) (AF)

640 100562 720 697388641 106512 721 706711642 112661 722 715835643 118612 723 725157644 124760 725 743405646 136661 726 752727647 142810 728 770975649 154711 729 780297650 160859 730 789421653 179901 731 798942654 186446 732 808661658 211835 737 856264659 218380 738 865983660 224727 740 885025661 231471 741 894942662 238413 742 905058664 251901 745 934810665 258843 746 944926666 265587 749 974678667 272529 750 984793669 286017 751 995107670 292959 753 1016132672 307636 754 1026446673 314777 755 1036959680 366149 756 1047273686 412562 758 1068297687 420099 759 1078612690 443306 760 1089124693 467702 761 1100033694 475636 762 1111140697 500033 763 1122050698 507967 764 1133157700 524231 765 1144066701 532760 766 1155174702 541091 767 1166083705 566678 768 1177190706 575008 769 1188099709 600595 770 1199207710 608926 771 1210711712 626777 772 1222413713 635504 773 1233917714 644430 775 1257322715 653157 776 1268826717 671008 778 1292231718 679736 779 1303735719 688661 780 1315438

Page G-33

Mayfield

Date of Table = UnknownDates of use = WY 1929 - 1999

ELEVATION STORAGE (FT) (AF)

410 102456415 112340420 122753425 133718430 145317434 155405

Cushman Lake

Date of Table = UnknownDates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

615.1 190617 3800622 13803625 20104626 22215629 28806632 35708

635.5 44108635.6 44350

637 47710643 62715648 75717649 78119650 81019658 102625664 119429670 136832673 145835692 204748696 217551700 230755705 247759711 268764719 297570723 312373726 323776729 335478733 351483737 367886738 372087

Page G-34

Alder

Date of Table = UnknownDates of use = Feb 1945 - Oct 2008

ELEVATION STORAGE (FT) (AF)

1116 701261117 707211118 717131119 725071121 744901123 760771124 770691125 782591126 792501127 804401134 873831138 921431140 941261145 1000771146 1014651151 1074161154 1115811155 1127711157 1155481161 1218951163 1254651164 1270521165 1288371166 1304241168 1339941174 1458951175 1480771177 1520441179 1564071180 1587881183 1653331185 1700931186 1726721190 1821921192 1873501199 2067881206 227614

1207.3 231740

Page G-35

G.7 Western Oregon

Lost Creek

Date of Table = 1977Dates of use = Entire Period

ELEVATION STORAGE (FT) (AF)

1560 701580 11161600 40381620 104021640 209821660 351831680 528391700 741841720 1000561740 1309111760 1667151780 2078601800 2545761820 3061991840 3627591860 4248971880 4928871900 5667271920 646035

Page G-36

Page G-37

Klamath

Date of Table = 10/1/1922 Date of Table = 1/1/1974Dates of use = WY 1928 - 1973 Dates of use = WY 1974 - 2008Source = KLAOLD.CAP Source = KLA.CAP

ELEVATION STORAGE ELEVATION STORAGE (FT) (AF) (FT) (AF)

4135 0 4136 04135.8 47200 4137 61300

4137 118600 4138 1270004137.7 160600 4139 1937004138.6 215100 4140 2626004139.3 257800 4141 3354004139.4 264000 4142 4144004139.5 270300 4143.3 5237004139.7 283300 4144 5833004139.8 290000 4145 6684004139.9 296900

4140 3041004140.1 3114004140.2 3188004140.3 3264004140.5 3420004140.7 3580004140.8 3661004140.9 374300

4141 3826004141.3 4078004141.5 4248004141.8 450600

4142 4680004142.5 5118004142.8 5385004142.9 5475004143.2 5748004143.5 6024004143.7 621000

This page is intentionally left blank

Supplemental Report – U.S Bureau of Reclamation Special Studies The special studies for the Yakima Basin, Deschutes Basin and Snake River Basin above Brownlee are included as provided by the USBR.

Page S-1

This page is intentionally left blank

Y

A

K

I

M

A

This page is intentionally left blank

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Columbia-Cascades Area Yakima Field Office Yakima, Washington March 2010

Naturalized and Modified Flows of the Yakima River Basin, Columbia River Tributary, Washington

Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public.

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Columbia-Cascades Area Yakima Field Office Yakima, Washington March 2010

Naturalized and Modified Flows of the Yakima River Basin, Columbia River Tributary, Washington Prepared by River and Reservoir Operations Chris Lynch, P.E., Hydraulic Engineer

Contents

iii

Contents

Page Acknowledgments ................................................................................................. v 1.0 Introduction ............................................................................................... 1

1.1 Yakima River Basin Operations ........................................................... 1 1.1.1 Winter Operations (November, December, January, February) ..... 5 1.1.2 Spring and Early Summer Operations (March-June, variable) ....... 6 1.1.3 Summer and Fall Operations (variable June through October) ...... 7 1.1.4 TWSA – Total Water Supply Available ......................................... 8 1.1.5 Yakima River Basin Minimum Stream Flows ................................ 8

1.1.5.1 TWSA Title XII Target Flows ............................................... 8 1.1.5.2 Power Subordination Flows ................................................... 9 1.1.5.3 Flip-flop .................................................................................. 9 1.1.5.4 Mini Flip-flop ....................................................................... 10 1.1.5.5 Other Spawning Flows ......................................................... 10 1.1.5.6 Winter Incubation Flow Targets .......................................... 11

1.1.6 Yakima River Basin Prorationing (shortage distribution) ............ 11 1.2 Objectives ........................................................................................... 12

2.0 Yakima River flows with No Irrigation and No Regulation ............... 13 2.1 Existing Unregulated Data Sets .......................................................... 13 2.2 Extending the Existing Yakima RiverWare Model Data Set.............. 13

3.0 Yakima River Modified Flows ............................................................... 17 3.1 Diversions ........................................................................................... 17 3.2 Operating Criteria ............................................................................... 17 3.3 Comparison of Year 2000 Modified Flows and Year 2010 Modified

flows .................................................................................................... 20 4.0 References ................................................................................................ 23

Acknowledgments

v

Acknowledgments The RiverWare model of the Yakima River basin was initially sponsored and developed under the Reclamation research and development Watershed and River System Management Program (WaRSMP) with further development by the Columbia-Cascades Area Office and the Yakima Field Office (YFO) for the Yakima Basin Storage Study, the Yakima River Basin Water Enhancement Program (YRBWEP) and for YFO seasonal operations planning. This effort would not have been possible without the work sponsored and completed under these programs. Special thanks to former CCAO employees Roger Sonnichsen and Warren Sharp for the effort invested in developing this model.

1.0 Yakima Basin Introduction

1

1.0 Introduction Modified Flows, as computed by Reclamation for the Yakima River, are the historic stream flow sequences regulated to reflect what would have occurred with 2010 simulated reservoir regulation and 2010 level simulated demands. The Modified Flows produced by Reclamation are different from the Modified Flows produced by the Corps of Engineers (Corps) and Bonneville Power Administration (BPA) for other parts of the Columbia System. That is because the Columbia River system hydropower simulation models used by the Corps and BPA require unregulated modified stream flows as inputs at the areas of primary interest and incorporate regulated modified flows for the Deschutes, Yakima, and Snake River basins. The Corps and BPA do not attempt to simulate reservoir operations at Reclamation irrigation facilities on the tributaries to the Columbia River. Modified flows quantified in the Pacific Northwest by the Corps, BPA and Reclamation are used together as base line stream flows for analysis of future conditions, such as changes to the Federal Columbia power system due to operational or climatic changes. This report describes the distribution modeling that was used to develop the 2010 Modified Flows for the Yakima River Basin at the mouth with the Columbia River. A RiverWare reservoir and river simulation model of the Yakima Basin was used to simulate natural-unregulated, historic, and current conditions. In the creation of modified flows, the model attempts to operate the Yakima System as it is described in the Interim Comprehensive Basin Operating Plan for the Yakima Project, Washington, (USBR, November 2002) with subsequent operational adjustments and modifications based on the Draft Biological Assessment of the Yakima River basin, and agreements made at River Operations meetings and System Operation Advisory meetings, and settlements; those operations are described below1

.

1.1 Yakima River Basin Operations

The Yakima River flows southeasterly for about 215 miles from its headwaters in the Cascades east of Seattle, Washington to its confluence with the Columbia River near Richland, Washington. Altitudes in the basin range from 8184 feet above mean sea level in the Cascades to 340 feet at the confluence. The Naches River is the largest tributary of the Yakima, entering the river at the city of Yakima. Major tributaries of the upper Yakima River (above the Naches confluence) include the Kachess, Cle Elum, and Teanaway Rivers. Major 1 Operation descriptions are mostly excerpts from the Interim Comprehensive Basin Operating Plan for the Yakima Project, Washington, (USBR, November 2002) unless subsequently modified.

1.0 Yakima Basin Introduction

2

tributaries of the Naches River are the Bumping River, Rattlesnake Creek, and the Tieton River. Toppenish and Satus Creeks, both originating on the Yakama Indian Reservation, are the major tributaries of the lower Yakima River (below the Naches confluence). Numerous smaller tributaries contribute seasonal flows to the rivers. The project provides irrigation water for a comparatively narrow strip of fertile land that extends for 175 miles on both sides of the Yakima River in south-central Washington (figure 1-1.). The irrigable lands, eligible for service under the Bureau of Reclamation’s (Reclamation) Yakima Project total about 465,000 acres. There are seven divisions in the project. Reservoir storage constitutes one division. In addition, there are six water delivery divisions: Kittitas (59,123 acres), Tieton (27,271 acres), Sunnyside (103,562 acres), Roza (72,511 acres), Kennewick (19,171 acres), and Wapato. The Wapato Division is operated by the Bureau of Indian Affairs (BIA), but receives most of its water supply from the project for irrigation of 136,000 acres of land. Over 45,000 acres not included in the 7 divisions are irrigated under supplemental water supply contracts with Reclamation. The Yakima River system includes the following storage reservoirs owned and operated by Reclamation: Keechelus, Kachess, and Cle Elum reservoirs on the upper Yakima River and Bumping and Rimrock reservoirs on the Naches River. They provide most of the physical operations capabilities needed to store and release water to meet; irrigation demands, flood control needs, and instream flow requirements. Clear Creek Lake Dam, also within the project is essentially a constant pool recreation reservoir above Rimrock Lake on the North Fork of the Tieton River and rarely provides storage water to the system. Figure 1-1 is a diagram of the Yakima River basin water distribution system. Other project features include 5 diversion dams, 420 miles of canals, 1,697 miles of laterals, 30 pumping plants, 144 miles of drains, 9 power plants (3 in private ownership), plus fish passage and protection facilities constructed throughout the project. Reclamation manages the entire system’s water supply as represented by the Total Water Supply Available (TWSA discussed below) but physically operates only the storage division. TWSA is the sum of system reservoir contents, the seasonal unregulated flow volume passing the Yakima River near Parker (PARW), and seasonal irrigation return flow volume. The six water delivery divisions and the supplemental contract entities operate their own water delivery/distribution systems. Their diversions are coordinated and tracked by Reclamation.

1.0 Yakima Basin Introduction

3

Figure 1-1: Yakima River Basin, Major Storage Reserovoirs. The average annual unregulated flow of the Yakima River basin near Parker (below Union Gap) totals about 3.4 million acre-feet (MAF), ranging from a high of 5.6 MAF (1972) to a low of 1.5 MAF (1977). The average annual irrigation diversion by entities recognized in the 1945 Consent Decree (Decree) totals approximately 2.2 MAF (period of record, 1961-1990). This does not include the other requirements for water in the basin, including instream flow, hydroelectric generation, and municipal and industrial uses. The total demand is supplied through a combination of stored water releases, unregulated flow (natural flow), and return flow. Total storage in the basin is a little over 1 MAF. The remainder of the demands, both instream flow and irrigation demand is supplied through unregulated tributary flow and bypassed reservoir inflow (reservoir inflow that is directly released rather than stored) and return flows. Demand cannot always be met in years of below average runoff. Shortages are reflected in rationed water supply to the “prorated” (junior) irrigation water rights and lower target flows. Project operations make use of a monthly forecasting process to provide an advanced indication of water availability. Reclamation operates the project to meet specific purposes: irrigation water supply, instream flows for fish, and flood control. Irrigation operations and flood control management have been the historic priorities for reservoir operations. Instream flow and requirements of anadromous fish have been incorporated as part of the current routine operation of the system, and take primary status based on legislation or judicial orders at certain times of the water year. Hydroelectric

1.0 Yakima Basin Introduction

4

power is produced incidentally to other project purposes. Reservoir storage releases are not made to meet hydroelectric power demand and, at times, power subordination is implemented in order to meet instream flow requirements. Reclamation tailors its operations to assure that public safety requirements are satisfied (flood control and recreational use), that water delivery contractual obligations are met (irrigation and power), and that instream flow targets (fish and wildlife habitat) are met. Maximizing flood control, irrigation water delivery, and meeting target stream flows requires continuous water management adjustment. On a daily basis, the project must take into account varying weather conditions, water demand, “travel time” of the flow from the reservoirs to the point of use, inflow from unregulated tributaries, return flow, and other factors to maintain appropriate flow levels at several control points (generally gaging station locations) in the basin. Recreational needs are considered, but are incidental to other project purposes. The 1994 Title XII legislation provided that an additional purpose of the Yakima Project “shall be for fish, wildlife, and recreation. Also, the existing storage rights of the Yakima Project shall include storage for the purposes of fish, wildlife, and recreation. But, the above specified purposes shall not impair the operation of the Yakima Project to provide water for irrigation purposes nor impact existing contracts.” Note that the 1992 authorization for and the reconstruction of Clear Creek Dam was primarily based on recreational benefits. It can be used for water supply but because of its small, 5,000 AF usable space, it is only used if Rimrock Reservoir storage is expected to be extremely low, i.e. nearly empty. The Yakima Field Office Manager is responsible for Reclamation’s operational control and management of the TWSA for the Yakima River basin. According to “Memorandum Opinion”: ‘Flushing Flows,’ December 22, 1994, Reclamation is: “an entity capable of responding to changing conditions.” Each year, in light of the annual prevailing conditions and all current legal considerations, the Yakima Field Office Manager will ensure that the concerned parties are involved as part of the consultation process for operating the basin seasonally. The Yakima Field Office Manager maintains contact with the different groups on a monthly, or as needed, basis via meetings or other forms of communication, to maintain continuity on the development of the year’s operation. These include periodic System Operations Advisory Committee (SOAC) meetings for fishery-related issues and monthly River Operations/TWSA meetings to present the water supply outlook and to discuss upcoming seasonal operations strategies. At such meetings, issues of concern related to project operations in the basin may be discussed and addressed with the Yakima Field Office Manager and others, allowing public input for possible inclusion into the seasonal operations stratagem. If consensus cannot be reached, the Yakima Field Office Manager, after review of available science and data, makes the final seasonal decisions.

1.0 Yakima Basin Introduction

5

Figure 1-2: Yakima River Basin (USBR, 2003).

1.1.1 Winter Operations (November, December, January, February) Inflows to the reservoirs in excess of downstream requirements are stored. Flows are bypassed or storage is released to provide minimum flows for the incubation of spring chinook eggs, fry, and other fish demands. Release schedules also consider flood control requirements. Flood control operations are guided by flood control space guidelines for the reservoirs and by forecasts of future runoff. Flood control operations must consider real time streamflow downstream of the dams prior to releasing water. For example, streamflows in the Yakima River at Easton, Cle Elum, Ellensburg, Parker, and Kiona and the Naches River at Cliffdell, and near Naches are evaluated prior to any reservoir release. The main objective during flood control operations is to provide maximum protection against flood damage in the Yakima River basin as a whole, without jeopardizing the irrigation water supply for the following year. Other issues or constraints

1.0 Yakima Basin Introduction

6

at this time include migration flow and possible power subordination to insure minimum stream flows are met in the bypass reaches of the river system. Ramping rates are also observed. During the winter months, November through February, the flood guide seeks to maintain 300 thousand acre-feet (KAF) of unfilled storage space to provide protection against a winter flood event before the spring forecasts become available. The 300 KAF of system storage space is distributed as follows: Keechelus 13 percent (39 KAF), Kachess 12 percent (36 KAF), Cle Elum 42 percent (126 KAF), Bumping 7 percent (normally 20 KAF since the 13 percent, 39 KAF, is unattainable,), and Rimrock 20 percent (60 KAF).

1.1.2 Spring and Early Summer Operations (March-June, variable) Streamflow into the reservoirs in excess of downstream requirements is stored. Irrigation diversion demand is largely met from natural flow accruing below the reservoirs from unregulated tributaries. Some supplemental releases are made for instream flow maintenance for incubation and rearing where unregulated inflow downstream of the dams is inadequate. Occasionally releases are made for enhanced passage flows, waves, or other flow enhancement needed to encourage smolt out-migration. Other issues or constraints at this time include flood control, fish passage in the river and at the reservoirs, ramping rates, various minimum target flows, balanced refill and use of reservoirs, and power subordination, as well as migration flows. The Spring refill/flood control guide requires variable system storage space of from 0 to 850,000 acre-feet to be available, depending upon forecasted runoff, from March 1st through June 30th. The spring/summer flood control storage space distribution is based on the same percentages as for the winter space described above. Spring/summer flood control/refill operations at the five project reservoirs in most water year, although during some dry years or low refill years the flood control space is not even close to being encroached upon. In case of a flood the reservoirs are allowed to fill into the flood control space as necessary while reservoir outflows are controlled to prevent downstream damage based on downstream flood flow levels defined by the National Weather Service. Current reservoir flood control and filling operations include an attempt to provide a more normative hydrographic shape in the mid-May through June runoff season. The flood control operations in May and June attempts to fill the storage reservoirs no later than June 1st , rather than June 30th in years that it is possible. This requires the earlier storage of more of the March through May inflow to the reservoirs than with the June 30th fill date. With the reservoirs full June 1st, the inflow to the reservoirs must be bypassed downstream, resulting in a more normative shaped hydrograph for the river system during late May, June, and early July. This modification of the flood control operation requires close monitoring depending upon the current year’s runoff forecast. Historically, this

1.0 Yakima Basin Introduction

7

will hold June’s downstream river flows higher, but not necessarily drive them to flood flows. June 1st fill has not been done in very high runoff years like 1997 and 1999 for two reasons; 1) flood control space is still needed in June and 2) unregulated tributary flows are so high already that they provide normative flows on the main stem during the desired period. Also during this time period, some of the reservoir inflow is stored and some is passed through the reservoir to supplement unregulated flows and return flows to meet downstream diversion demands. Unregulated flow and return flow are generally adequate to meet irrigation diversions through mid-June. However, storage releases have begun as early as April (April 6 in 1977) in dry years and as late as August (August 17 in 1972) in wet years. The average date of storage control (1981-2009) in the Yakima River basin is June 18th while the median date is June 24th.

1.1.3 Summer and Fall Operations (variable June through October) During June and July (but ranging from as early as April in very dry years to August in very wet years) reservoirs are generally operated to maximize storage while meeting downstream demands, i.e. release as little water as possible to meet downstream demands. Normally from sometime beginning in mid June to early July (but ranging from April in very dry years to August in very wet years) through the end of the irrigation season (normally October 20th), releases from stored water are required to meet both irrigation needs and Title XII instream flow targets. The system is on “storage control” when reservoir releases in excess of inflows are required to meet downstream demands, including the Title XII target flows. This results in a decline in total storage while the flow at Parker is controlled to near the minimum target flow. Other issues or constraints at this time include passage flows in the river and at the reservoirs, ramping rates, various minimum target flows, balanced use of reservoirs, and power subordination. In August and early September operation objectives for the fall/winter season are discussed and established. In August, river operators begin the transition to fall operations which establishes the demands, constraints, and operational criteria for the fall/winter season. In the fall the irrigation season is brought to a close. During August, September, and October, the system is operated to meet irrigation needs, to maintain system storage flexibility, and to ensure that spawning, incubation, and rearing of spring chinook eggs and fry can be sustained at an acceptable level throughout the fall, winter and spring seasons without undo jeopardy to reservoir refill. Fishery flow needs are coordinated with SOAC and at River Operations meetings. During the late August through September 10th period, the mini flip-flop and flip-flop operations are performed, lowering releases from the Upper Yakima Reservoirs, Keechelus and Cle Elum, and increasing releases from Kachess and Rimrock to meet irrigation demands throughout the system. The flip-flop operation allows Reclamation to protect salmon redds during the incubation and emergence/rearing (fall and winter) periods, while minimizing the release demands and maximizing

1.0 Yakima Basin Introduction

8

storage. Requests for power subordination are also possible on the lower river system during this period, to maintain instream flows for migration, passage, and rearing.

1.1.4 TWSA – Total Water Supply Available Total Water Supply Available (TWSA) is the benchmark measurement of the water supply for the Yakima Basin irrigation season. It was first defined in the Court’s 1945 Consent Decree which defined the water supply and how it would be distributed, particularly in a water short year. The TWSA is the sum of system reservoir contents, the seasonal unregulated flow volume passing the Yakima River near Parker (PARW), and seasonal irrigation return flow volume. It is computed each month from April through September as needed and quantifies the supply volume in acre-feet from the first of the month it is computed to the end of September. The TWSA is used to define instream flow targets, shortages, evaluate water transfers, etc. A related value is the Irrigation Water Supply Available (IWSA) which is computed from the TWSA minus the estimated flow that will flow past PARW from the first of the month to September 30 and minus the estimated volume of water remaining in storage at the end of the day on September 30.

1.1.5 Yakima River Basin Minimum Stream Flows

1.1.5.1 TWSA Title XII Target Flows Summer instream flows on the main stem of the Yakima River are defined in Title XII of the Yakima River Basin Water Enhancement Program (YRBWEP) legislation (Table 1-1). It established new target flows, beginning in 1994, for instream purposes to be maintained past the Sunnyside (PARW) and Prosser Diversion Dams (Yakima River near Prosser, YRPW) using criteria based on TWSA. The streamflow targets range from 300 cfs to 600 cfs, depending on the estimate of TWSA. The target flows to be passed at Sunnyside and Prosser Diversion Dams are not instantaneous flows to be uniformly maintained at all times, but are subject to reasonable fluctuations due to project operations. However, for any period exceeding 24 hours, flows at the Sunnyside Diversion Dam (gaging station PARW) cannot decrease to less than 65 percent of the target flow; and the flows at Prosser Diversion Dam (gaging station YRPW) cannot decrease by more than 50 cfs from the target flow. Table 1-1. Title XII Target Flows for PARW and YRPW Based on TWSA

TWSA, KAF Title XII Apr-Sep May-Sep Jun-Sep Jul-Sep Flow, cfs

3200 2900 2400 1900 or greater provides 600 2900 2650 2200 1700 or greater provides 500 2650 2400 2000 1500 or greater provides 400

0 0 0 0 or greater provides 300

1.0 Yakima Basin Introduction

9

The flows at PARW and YRPW have historically been greater than 600 cfs outside of the irrigation season.

1.1.5.2 Power Subordination Flows A power subordination flow is a low flow target observed while water is or would be diverted for hydropower. Power subordination flows are observed below Roza Diversion Dam (as measured at the Yakima River below Roza Dam, RBDW) and below Prosser Diversion Dam (YRPW). Power is subordinated to maintain 400 cfs at RBDW. Power subordination flows vary throughout the year at YRPW as set forth in Table 1-2. Table 1-2. Yakima River at Prosser Minimum Target Flows

Month

Target, cfs power ON

Target, cfs power OFF1 Reason Justification

January 600-800 fall chinook incubation SOAC 3 February 600-800 fall chinook incubation SOAC March 600-800 fall chinook incubation SOAC April 1000 T-XII 4 smolt outmigration T-XII, SOAC May 1000 T-XII smolt outmigration T-XII, SOAC June 1000 T-XII smolt outmigration T-XII, SOAC July 450 2 T-XII fish passage and rearing T-XII, SOAC August 450 2 T-XII fish passage and rearing T-XII, SOAC September 450 2 T-XII fish passage and rearing T-XII, SOAC October 1-20 450 2 T-XII fish passage and rearing T-XII, SOAC October 20-31 600-800 fall chinook spawning SOAC November 600-800 fall chinook spawning SOAC December 600-800 fall chinook spawning SOAC

1 = hard target requiring reservoir releases if necessary, 2 = 450 cfs or TXII flow plus 35 cfs, whichever is higher 3 = System Operations Advisory Committee; 4 biologists that advise the Yakima Field Office Manager on fisheries needs and issues. 4 = Title XII of the Yakima River Basin Water Enhancement Program Legislation.

1.1.5.3 Flip-flop An operation known as flip-flop is done to encourage anadromous salmon (spring chinook) to spawn at lower river stages in the upper Yakima River and its regulated tributaries above the mouth of the Teanaway River, so that the flows required to keep the redds wet and protected during the subsequent incubation period (October 20 through March 31) are minimized from the upper Yakima reservoirs. The Quackenbush Decision, October 1980, directed the release of storage for protection of redds in the upper Yakima River basin. The flip-flop operation was conceived and initiated in 1981, and has been a part of the Yakima Project operations since that time. In order to support the flip-flop operation, Reclamation drafts heavily from Keechelus and Cle Elum reservoirs to meet lower basin demands during the summer (July and August) and reserves storage

1.0 Yakima Basin Introduction

10

in Rimrock and Kachess Reservoirs to meet lower basin demands later in the year (August 25th through October 20th). The flow reductions begin in late August or early September and continue over a 10 to 20-day period. The flow in the upper Yakima River is reduced by approximately 3,000 cfs, with the majority of the cutback taking place in the Cle Elum River. The flow for spawning is normally reduced to a range of 180 to 250 cfs and is subsequently reviewed, which may include field surveys, by SOAC for acceptability. The Yakima River below Easton Dam (EASW) is reduced from 400-600 cfs to a flow in the range of 180-240 cfs by early September if it hasn’t already been obtained during the mini flip-flop operation (see below). With this reduction of flow in the upper Yakima Reach during the fall (September and October), most lower basin demands are met from Rimrock Reservoir releases of up to 2,400 cfs. Reclamation has operated to limit the rate of flow reduction per day over a 10-day period in the upper Yakima River system to about 225 to 300 cfs per day.

1.1.5.4 Mini Flip-flop An operations strategy commonly referred to as “mini flip-flop” is performed in years of sufficient water supply between Keechelus and Kachess Lakes. Heavier releases are made from Keechelus than from Kachess during June, July, and August to meet the upper basin demands, so that Kachess Lake storage can be reserved for use in the late summer and fall. In the fall (September and October), heavier releases are made from Kachess to meet upper basin demands, and the releases from Keechelus Lake are reduced to provide suitable spawning flows in the Yakima River reach from Keechelus Lake to the head end of Lake Easton. The Kachess release is increased to 1,400 cfs to supply the continuing downstream demand of about 1,450 cfs at the Easton Diversion Dam. This 1,450 cfs demand includes 180 to 240 cfs for Yakima River instream flows at Easton (EASW), 400 cfs for the Kittitas Canal bypass, and up to 850 cfs for KRD and Cascade Irrigation District (CASID) irrigation demands. The flow reductions begin in late August and continue over a 10 to 20-day periodand follows the prescribed ramping rates. Target flows at the stream gage stations in the reaches of concern are set annually based on prevailing conditions and coordination at River Operations Meetings and with SOAC. Usual flow ranges are: Yakima River near Martin (KEE) 60-100 cfs, and Yakima River near Crystal Springs (YRCW) 80-100 cfs and Yakima River instream flows at Easton (EASW), 180-240 cfs.

1.1.5.5 Other Spawning Flows Spawning flow levels are also provided on the Bumping River in the range of 170 to 220 cfs. These flow levels are determined by the Yakima Field Office Manager considering current and future water management needs, with input or recommendations provided by SOAC, irrigation district managers, Reclamation environmental staff, and others.

1.0 Yakima Basin Introduction

11

1.1.5.6 Winter Incubation Flow Targets Winter incubation flows are initially set in late October depending upon spawning flows. They may be adjusted after December 1st depending on the El Nino Southern Oscillation (ENSO) condition, the storage system carry-over on November 1st, precipitation in November and other prevailing conditions. After January 1 the water supply forecast may also influence the decision to adjust target flows. Incubation flows are intended to be of sufficient magnitude to provide 2 inches of flowing water over the tail spill of the redds. Incubation flows are determined by the Yakima Field Office Manager, with input and/or recommendations provided by SOAC, irrigation district managers, Reclamation environmental staff, and others. This process was simulated in the model using reservoir storage and historical ENSO data. For modeling purposes the flows vary as follows: Kee, 80 to 100 cfs; Kac 15 cfs; Cle 180 to 220 cfs; Easw 190 to 220 cfs. Winter minimum flow levels on the Bumping and Tieton Rivers vary based on the reservoir carry-over, the prevailing hydrologic conditions, and input from SOAC. Bumping River target flows decline as the reservoir level decline and indication show that the current level is not sustainable without running out of storage. The model has a schedule of reductions based on the reservoir level. Flows range from a low of 60 cfs for extremely low pools up to 200 cfs. The schedule is designed to have the most common flow be about 170 cfs. Flows in the Tieton River at Canal Headworks near Naches (TICW) are set to be 50 cfs in a dry year, 75 cfs in a moderate year, and 100 cfs in a good wet year. These flows are currently under discussion and transition in real operations but the values used should be fairly good representations of current and future operations.

1.1.6 Yakima River Basin Prorationing (shortage distribution) Prorationing is necessary when the TWSA is not adequate to meet all irrigation entitlements and required stream flow targets. Prorationing is the shortfall in supply that must be born equally by the junior users whose water rights have a May 5, 1905, appropriation date. Senior users hold water rights with appropriation dates prior to May 5, 1905. Senior rights have not experienced a shortage since the Court’s 1945 Consent Decree implemented the TWSA method. Prorationing is calculated by taking the water left in the TWSA after subtracting the estimated carry-over system storage on September 30th, the estimated seasonal flow past the Yakima River at Parker stream flow gage (includes minimum flow requirements as well as uncontrolled spring and summer snowmelt flows), and senior entitlements. The prorationed amount is determined monthly or as needed. Historically the senior, nonproratable, users have diverted their full irrigation entitlements. The recognized quantities of non-proratable and proratable irrigation entitlements are summarized in table 1-3 below. The model is capable of

1.0 Yakima Basin Introduction

12

computing prorationing of junior entitlements as well as computing rationing rates of the senior entitlements in case the Climate Change scenarios are more severe than historical conditions. Table 1-3.–TWSA Irrigation Entitlements (AF) recognized by 1945 Consent Decree – April through September and October. Non-proratable Proratable Total

Month Monthly

Remaining through September Monthly

Remaining through September Monthly

Remaining through September

April 160,973 1,070,271 93,857 1,239,199 254,830 2,309,470 May 186,637 909,298 228,463 1,145,342 415,100 2,054,640 June 182,240 722,661 258,150 916,879 440,390 1,639,540 July 189,640 540,421 268,236 658,729 457,840 1,199,150 August 186,058 350,817 257,822 390,493 443,880 741,310 September 164,759 164,759 132,671 132,671 297,430 297,430

October 115,115 115,115 44,025 44,025 159,140 159,140 (Irrigation entitlement as used in computation of TWSA since 1980. Note: 1992 entitlement summary shows slightly greater quantity.)

1.2 Objectives

This study is designed to develop unregulated (flows with the effect of regulation and irrigation removed) and 2010 level modified flows for the Yakima River at the Mouth. Unregulated flows for the Yakima River at the Mouth are presented and described in Chapter 2. The modified flows are described in Chapter 3 and are presented as a time series of monthly data for the Yakima River at the Mouth from water years 1926 through 2009 (84 years). Data is displayed as average flow in cfs.

2.0 Yakima River at the Mouth Unregulated Flows

13

2.0 Yakima River flows with No Irrigation and No Regulation

2.1 Existing Unregulated Data Sets

Reclamation’s Hydromet system routinely computes an estimate of daily unregulated flows (flows with no irrigation and no regulation), referred to as Hydromet unregulated flows, or Qu’s, for specific stream gaging stations in the Yakima Basin. The Yakima River near Parker is the lowest point in the basin with computed Qu’s. The Yakima River at the Mouth is not gaged and does not have Qu data. The streamgage closest to the mouth, the Yakima River at Kiona (KIOW) does not have Qu data. A good half of the effort in this study was expended developing an unregulated data set for the Yakima River including the Yakima River at the Mouth. During the past decade Reclamation developed a RiverWare model for the Yakima basin. A simple routing/water balance version of this model was used to compute, in a more rigorous manner than the Qu computation, a set of unregulated flows and corresponding local flows for water years 1981-2005 at key locations in the basin. This data set has been evaluated and subsequently adopted for use in the operations simulation version of the Yakima RiverWare model and used to effectively simulate Yakima Basin operations for planning studies and river operations analyses. Unregulated flows represent the flows that would have occurred without reservoir regulation or irrigation demands. The unregulated flows are not naturalized flows. The computation of naturalized flows takes into account and attempts to remove the secondary consequences of regulation/irrigation such as lake attenuation, return flow lag, seepage and ground water return delays, as well as the effects of over bank flooding, etc. The RiverWare model did recognize some lagging of return flows but did not develop a detailed model to specifically account for the effects of the aquifer and ground water storage and long duration lagged return flows, neither did it take into account the attenuating effects of reservoir storage. Neglecting this effort was justified in this study because the Yakima basin is relatively narrow and confined with relatively short ground water response times and each of the reservoirs except for Rimrock was built “on” an existing lake so the attenuation would have existed pre-project.

2.2 Extending the Existing Yakima RiverWare Model Data Set

A complete set of observed data (stream flow and diversion records) to effectively compute unregulated flows in the RiverWare model is not available for the entire period 1926-2009. A complete set of such records were available for the period 1981-2005. The computed

2.0 Yakima River at the Mouth Unregulated Flows

14

unregulated RiverWare flows for the 1981-2000 period were compared to the Hydromet unregulated flows (Qu’s) and the unregulated flows from the 2000 level modified flow study. Both the Hydromet and the 2000 level modified flow study had unregulated flow data prior to 1981. Reclamation developed regression relationships between the RiverWare data sets and the unregulated flows from both the Hydromet and the 2000 level modified flow study and extended the RiverWare data set to cover the whole period, 1926-2009. The main difference between the Hydromet/2000 unregulated flows and the RiverWare unregulated flows was the extent of the accounting for diversions and return flows. In the RiverWare model Reclamation attempted to account for essentially all the known diversions and also attempted to simulated return flows to compute unregulated flows from the observed (regulated) flows. The Hydromet computation of unregulated flows only takes into account the major irrigation diversions in the basin. The minor diversions and the return flows are assumed to offset each other and so are not explicitly accounted for. Because of the computational differences the resulting unregulated flows at locations below diversions were different when comparing the two data sets; Hydromet/2000 unregulated flows with RiverWare unregulated flows. RiverWare unregulated flows were typically higher. Reclamation extended the RiverWare unregulated data set back to 1926 using the Hydromet/2000 flows with the relationship between the data sets for the 1981-2000 period. Table 2.1 shows the unregulated flows for the Yakima River at the Mouth.

2.0 Yakima River at the Mouth Unregulated Flows

15

Table 2-1: 2010 Yakima River at the Mouth, Unregulated Flows, WY 1926-2009, cfs. Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1926 1866 1937 4926 3616 3719 6363 7982 5672 3187 1648 1508 1607 1927 3432 3149 5196 3115 3286 4422 7578 12655 15106 5530 2420 2563 1928 4745 7223 6891 7660 3572 6680 6969 14813 7841 3570 1795 1918 1929 3148 2255 1821 1679 1778 3363 4003 10593 9088 3655 1896 1536 1930 1786 1548 1740 1600 4548 4566 9808 7080 5795 2746 1977 1849 1931 2118 2170 1491 2205 3606 4315 6195 10454 5879 2461 1665 1688 1932 2221 3502 2122 3520 5295 10359 9817 12745 11468 5120 2276 1943 1933 2524 8458 5784 5200 2937 3596 7665 11443 16742 9522 3584 2785 1934 5682 6062 19651 12175 8534 11295 13501 8784 4880 2776 1961 2113 1935 3882 7872 4917 8044 7238 4940 6445 12962 11918 5056 2417 2264 1936 2040 1921 1784 2569 2114 4237 11957 17528 12241 3800 2062 1941 1937 1852 1555 2507 1704 1944 3785 7479 12299 15104 5759 2644 2315 1938 2060 5476 5813 5578 3493 6327 12351 15449 11887 4037 2180 1890 1939 2286 2818 3867 4204 2676 4209 8334 10257 7106 3655 1909 1942 1940 2125 2506 4422 2580 4254 6474 8619 10127 5449 2502 1818 2091 1941 2351 2510 3731 2652 2757 5193 7301 6041 4413 2306 2005 2854 1942 3205 3839 5380 2522 2893 3508 8210 8419 7555 3617 1999 1905 1943 1890 4093 5015 4542 4089 5039 14999 12351 13702 7514 2924 2065 1944 2372 2432 3817 2051 2440 3282 4976 7589 5866 2488 1864 2337 1945 2125 2372 2681 5058 4826 3065 5093 12416 8146 3264 2179 2388 1946 2467 3256 2965 4011 2725 4670 9339 18098 13696 6442 2726 2648 1947 3140 3204 8825 4773 6132 7292 9564 12613 8273 3766 2467 2597 1948 5823 6107 4553 3811 4089 4357 7406 16604 21520 6023 3327 2612 1949 3239 3254 3024 2002 3477 6431 13016 20886 13310 6091 3132 2542 1950 3396 6506 5250 3141 3930 7366 9020 15472 21402 10449 3793 2358 1951 4427 6799 9912 6102 11177 6131 13432 17965 12359 4799 2603 2571 1952 4388 3862 3513 2413 4208 4024 9992 12892 8802 4528 2508 2132 1953 1964 1680 1813 8103 7622 4321 6899 13489 11692 6936 3129 2256 1954 2563 3182 6169 3884 4513 5299 8679 16926 14366 10521 4378 3080 1955 3183 4493 3151 2703 3543 2766 4422 10939 16803 8347 3072 2588 1956 5009 7908 8441 5381 3638 6555 17542 25071 18657 9002 3483 3006 1957 3955 3800 8679 2925 3128 5196 10074 17012 8016 2955 2291 2250 1958 2883 2537 3460 3496 6020 5851 9293 16930 8172 2895 1829 2624 1959 3611 8443 9659 8178 5392 5967 10516 11958 12435 5481 2471 4529 1960 6414 8997 7156 3426 4267 5487 10005 10962 10468 3656 2402 2474 1961 2868 4524 2951 4913 9280 8162 10742 15293 14948 4421 2356 2339 1962 3043 2916 3899 6442 5513 3659 11159 9138 9933 4571 2645 2384 1963 3631 6675 6908 4649 9345 5295 7433 9408 6826 3294 2410 2283 1964 2346 3325 3088 3804 3136 3394 5760 11034 17510 8563 3723 2792 1965 3183 2979 6151 5999 10639 6658 11208 12321 11095 4552 2834 2627 1966 2643 3076 2709 2852 2235 4260 10011 12377 8481 4680 2195 2455 1967 2704 2996 6330 5273 5537 3760 4549 13000 14872 5120 2300 2034 1968 4606 4595 6057 7593 10403 8584 4754 8714 8191 3567 3078 3560 1969 3730 5510 4311 4921 2980 5669 11276 18689 12475 3572 2207 2743 1970 2929 2519 2384 4090 4627 5567 6544 12956 12919 3845 2160 2502 1971 2555 3111 3087 6712 9311 4512 7059 19344 15369 9462 3546 3099 1972 2883 3565 3259 4500 8581 17415 10321 22448 21226 9871 4366 3693 1973 2886 2935 5744 5487 3101 3446 4632 7699 5636 2533 1679 2193

2.0 Yakima River at the Mouth Unregulated Flows

16

1974 2434 4750 5862 13934 6675 6115 11900 16513 23354 11514 4648 3111 1975 2295 2538 4392 6333 5084 5611 6409 15701 16663 8102 3912 2863 1976 3352 6138 14112 8406 5886 4316 9043 15843 10970 8267 4959 3161 1977 2693 2507 2497 3191 2828 2218 4411 3968 4402 1955 1895 2755 1978 2228 5902 15371 4801 5123 8509 9868 10453 9666 4958 3017 3543 1979 2197 2609 2469 1811 3102 5312 5882 11410 5982 2949 1754 1787 1980 1553 1943 6575 3368 4272 7466 11738 13157 7806 3839 2435 2787 1981 2139 4654 11656 7536 8956 5822 5582 7999 6545 3296 2012 2229 1982 3229 2649 3525 4796 12026 8059 7314 14609 15139 6681 3055 3162 1983 3162 2744 4472 7926 6563 11778 9683 14011 11011 6083 3305 3381 1984 2296 4883 3005 10407 6185 7187 7389 9587 13369 6484 2794 2982 1985 2820 2991 2436 1952 2395 3560 9847 11693 9595 2911 2111 2959 1986 3354 4470 1964 3025 6182 11846 8454 9059 7441 3144 1864 2817 1987 2211 4601 2971 2261 3142 7487 9012 12004 5220 2628 1652 1446 1988 1280 1443 3045 2348 3655 4934 10678 10735 7742 3484 1976 2013 1989 2589 4187 3845 3828 3076 4335 11839 10848 8068 3394 2239 1856 1990 2017 4205 4880 5432 4430 5166 13053 9670 10253 4584 2779 2393 1991 3973 11923 5556 4935 9026 5066 8021 9639 9234 5638 2719 2016 1992 1717 3315 4673 3557 5550 7050 7094 7131 3530 2187 1535 1901 1993 1815 2528 2192 2514 2813 5197 7726 11914 6046 2704 1924 1692 1994 1563 1431 2162 3069 2427 4787 8903 8072 4285 1888 1013 1192 1995 1780 3042 5069 4719 14481 9493 8282 14664 9441 4367 2477 2630 1996 4398 11753 12247 10018 19686 9278 12065 10422 8749 4549 2841 2838 1997 2759 3812 4219 8549 8610 11102 14024 21683 16419 7661 3580 3801 1998 5228 5582 3245 3802 5747 7453 9026 15555 8906 3827 2344 2066 1999 2229 3683 5186 8085 4902 6025 8647 13850 17537 10082 4982 2895 2000 2716 6153 6979 3428 3233 4667 12190 11311 10180 4350 2385 2823 2001 2892 1669 1513 1712 1683 3130 4916 8580 4513 2121 1800 1437 2002 1852 4556 3782 6150 3888 4781 10686 12538 13838 5281 2001 2113 2003 1783 1699 2087 4956 9105 7613 8825 9486 8228 2766 2276 2270 2004 3209 4158 3389 2867 3944 6600 9022 9386 6237 2914 3242 3807 2005 3079 3536 4528 6072 3468 2639 4848 6172 2967 1661 1541 1701 2006 1912 2630 3240 6804 4795 3586 9113 16476 11934 3723 2055 1891 2007 1468 9553 3909 5635 5742 12647 9260 11191 8141 3260 2006 1937 2008 2676 2394 4731 2409 2974 4009 4904 17789 11575 5211 2475 2149 2009 2267 6251 3217 9402 3170 3578 7991 14188 10876 3211 2354 2340

3.0 Yakima River at the Mouth Modified Flows

17

3.0 Yakima River Modified Flows Modified flows are flows that represent 2010 level reservoir operations and irrigation demands throughout the period of record in this study, 1926-2009. The Yakima Basin RiverWare model was used to develop the Modified Flows dataset for the entire period 1926-2009 but only the period 1926-1996 was used. Observed flows for 1997-2009 were adopted from actual Yakima River at the mouth flows as computed from USGS finalized records for the Yakima River near Kiona and adjusted for irrigation and local and return flows because they represent current practices.

3.1 Diversions

The 2010 level demands were developed using data covering the period of 1991-2001. This period reflects current use and contains a good sample of wet, medium, and dry water years. Since the diversions are largely made up of irrigation demands, increases in population were not assumed to have had any substantial impact on demand. Conservation and groundwater mitigation efforts were also assumed to not have a detectable effect on the demand data. The diversion schedules used in this study were developed for use in the Yakima Basin RiverWare model used in the Storage Study and the Yakima Basin Operations Model. The diversions schedules were reevaluated and verified or updated. Only the Kittitas Reclamation District’s curve was updated to remove the effects of wheeled water (water they diverted for other purposes and not for their use). This wheeled water is accounted for separately in the model. The normal/wet year diversion curves were used during non-drought years while the dry year curves were used in the drought years for the non-prorated water and to limit the prorated water. The prorated water diversion was the minimum of either the dry year curve or the prorated entitlement.

3.2 Operating Criteria

The reservoir operating rules, stream flow targets, and other system constraints and objectives used in the Modified Flows model run were equivalent to those currently being used in 2010. For the Modified Flows analysis, the model accounted for simple seepage and groundwater responses based on 2010 level demands. In the Yakima basin most of the groundwater return flows equilibrate within several months. The model begins its calculation period in WY 1925 with 1925 serving as a priming or “spooling up” year. Results from the years 1926-2009 are presented. Table 3.1 shows the modified flows for the Yakima River at the Mouth.

3.0 Yakima River at the Mouth Modified Flows

18

Table 3-1: 2010 Yakima River at the Mouth, Modified Flows, W 1926-2009, cfs. Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1926 1694 2285 3004 2872 2939 4117 2146 1159 1134 994 800 798 1927 1943 2286 3815 2596 2776 3505 2578 4047 5561 1817 1423 1253 1928 2040 4387 5596 7071 3352 4713 3446 6337 2535 1404 1073 1182 1929 1800 2492 1958 1843 1901 2317 935 1823 1757 1430 1151 968 1930 1766 2069 1714 1617 2853 2602 3006 1314 1545 1321 1080 981 1931 1703 2139 1611 1628 2736 2472 1521 2477 1607 1284 1144 991 1932 1666 2859 1904 2669 3095 7524 3865 3185 4473 1842 1228 1261 1933 1790 5058 4417 4301 2666 2976 3669 5490 6982 4355 1687 1431 1934 2678 6295 17578 13781 7719 10040 8814 3562 1683 1333 1283 1201 1935 2516 5434 3715 5841 6160 3976 2473 3781 5497 1698 1389 1353 1936 1756 2517 1982 2274 1956 3049 4884 5379 5679 1541 1280 1231 1937 1842 2205 2006 1759 1801 2708 2604 2564 4170 2575 1544 1541 1938 1936 3316 4239 4811 3251 5485 6290 5969 6345 1779 1500 1310 1939 1850 2718 2733 2937 2288 2682 2191 1835 1786 1517 1246 1219 1940 1849 2305 2646 2218 3215 4208 2466 2288 1638 1450 1292 1269 1941 1943 2343 2859 2406 2548 3178 2167 1099 1485 1344 1155 1214 1942 1724 2628 3713 2268 2707 2583 2368 1651 1853 1592 1303 1229 1943 1804 3053 3756 3681 3547 3357 8545 3317 4952 3120 1709 1393 1944 1982 2711 2834 2075 2125 2123 983 974 1588 1461 1232 1131 1945 1643 2291 2062 3023 3333 2144 1148 2359 2189 1498 1437 1228 1946 1813 2539 2124 3292 2422 3436 3510 6259 6396 2301 1567 1668 1947 2219 2856 6683 3542 4620 5288 4556 5023 3395 1540 1459 1450 1948 2991 4247 3703 3353 3365 3799 3987 7493 12899 2488 1800 1559 1949 2039 2913 2558 1996 2833 5036 7856 10835 6716 1749 1699 1492 1950 1954 3760 4614 2872 2993 7901 6411 8514 10004 5610 1599 1286 1951 2224 5479 9126 6419 8990 7602 9936 8931 6178 1833 1470 1547 1952 2383 3260 3054 2306 3687 3004 3676 3373 3004 1694 1560 1492 1953 1787 2368 2139 4993 5590 3286 1889 4102 3278 2454 1617 1516 1954 1909 2694 3971 2972 3664 4288 4826 8765 4730 5382 1872 1679 1955 2272 3887 3105 2572 2817 2178 1732 2754 8442 3386 1520 1525 1956 2504 5517 7609 5559 3624 8830 13801 15680 9694 4128 1919 1897 1957 2442 3180 7191 2891 2576 4046 5441 8509 3614 1300 1339 1379 1958 2205 2703 2638 2773 4388 4634 3905 5224 2577 1205 1166 1324 1959 2288 5205 6992 6827 4741 4987 6221 3779 5638 1740 1397 1740 1960 2951 6719 7668 3838 3621 4286 6639 2426 5013 1160 1314 1474 1961 1991 3296 2765 3351 6551 6500 6193 6346 8320 1325 1359 1283 1962 1944 2754 2850 4418 4314 2844 4419 1878 3396 1467 1291 1330 1963 2196 4432 5228 4029 6613 3939 3077 2390 2383 1426 1363 1282 1964 2021 2694 2621 2721 2712 2431 1597 2115 6541 3223 1626 1425 1965 1917 2718 4470 4806 9643 6455 7182 3982 5660 1581 1529 1533 1966 1965 2801 2509 2588 2217 3003 4130 2856 1732 1592 1253 1319 1967 1909 2703 4180 3551 4279 2751 1386 3668 6612 2008 1267 1150 1968 2319 3420 3698 5999 7233 7395 1410 2356 3060 1258 1541 1653 1969 2140 3923 3479 3695 2765 4672 6640 8154 7219 1415 1342 1389 1970 1870 2565 2382 3342 4142 4126 2396 3191 5057 1271 1204 1326 1971 2084 2561 2678 4642 7138 4256 2977 9539 5877 3690 1474 1842 1972 2130 3154 3147 3944 5938 18820 8709 13835 11448 4749 1815 1699 1973 2089 2903 4698 5170 2896 2650 1055 1318 1311 958 915 1006

3.0 Yakima River at the Mouth Modified Flows

19

1974 1922 4031 4778 10914 6225 5796 8229 8155 11523 5868 1855 1668

1975

2039

2684

3689

5360

4394

5277

3784

8150

7620

3628

1813

1723 1976 2161 3988 12508 8536 5114 4889 5936 7508 3561 3257 1978 1752 1977 2167 2702 2311 2752 2207 1631 795 889 1010 992 821 1169 1978 1626 3016 11986 4598 4534 6103 5460 2311 3778 1822 1391 1479 1979 1597 2485 2277 1852 2631 3312 1418 2089 1164 1097 963 901 1980 1471 2240 3690 2925 3354 6044 4643 4940 2265 1834 1520 1549 1981 1900 2996 6650 7004 6350 4410 1325 1581 2083 1317 1137 1290 1982 2108 2351 2837 3667 8521 7042 3699 5366 6726 2534 1634 1832 1983 2136 2611 3251 5875 5426 10073 6591 5408 5496 2152 1714 1735 1984 1867 3368 2720 7218 5161 5901 4284 1953 5977 2214 1399 1562 1985 1936 2679 2291 2041 2401 2671 3728 2056 2833 1008 1220 1646 1986 1844 3028 2150 2636 4234 8618 3268 1764 1930 1363 1063 1629 1987 1889 2807 2550 2089 2748 5095 2718 3321 1245 1103 964 901 1988 1437 1849 2546 2250 2878 2897 3623 1830 1572 1021 778 1031 1989 1602 2666 2640 2593 2448 3210 4851 2325 2060 1201 1163 1095 1990 1664 2582 2940 3717 3152 3717 6334 1906 4031 1330 1479 1465 1991 1869 6522 5737 4533 6147 5381 3957 2540 3394 1790 1226 1112 1992 1476 2580 3208 2553 4007 4511 2015 1320 1018 980 856 996 1993 1519 2104 1945 2021 2481 3448 2773 2301 1266 1022 908 959 1994 1421 1741 2039 2339 2164 2887 2484 1090 656 582 537 548 1995 1269 2410 3277 3941 10391 7603 3846 4728 3830 1446 1319 1433 1996 1934 5925 11246 9633 17091 10148 7739 3240 3396 1471 1433 1501 1997 2051 2554 2801 7090 7279 8990 11926 13900 8194 3086 2018 2287 1998 2649 4994 3453 3475 5175 5483 4502 8580 4350 1526 1491 1581 1999 1883 2490 3586 5982 4050 5494 5044 6080 8508 4463 1989 2025 2000 2289 3606 7393 3516 3544 4275 6331 4188 4505 1463 1414 1791 2001 2264 2151 1904 1817 1751 2086 1298 1237 817 666 708 901 2002 1303 2445 2683 4268 3062 3421 4869 4246 7005 1831 1175 1576 2003 1994 1987 2023 3334 6733 4926 4317 3236 3120 923 1657 1611 2004 2185 2637 2742 2335 3163 4695 3434 1942 1224 1226 2085 2106 2005 2445 2479 2693 3515 2600 1587 1258 1503 838 754 821 1220 2006 1713 2095 2307 4965 3979 2940 4989 6919 4897 1016 1101 1338 2007 1368 4754 3167 4438 4681 9164 5751 4946 3041 898 1160 1573 2008 2100 2079 3176 2191 2800 3364 2326 6196 3144 1623 1143 1526 2009 2197 3727 2659 6617 2981 3107 4034 7113 5779 887 1511 2025

3.0 Yakima River at the Mouth Modified Flows

20

3.3 Comparison of Year 2000 Modified Flows and Year 2010 Modified flows

The 2010 level modified flows compared well with the 2000 modified flows data set but did show some differences. In most of the years that showed a difference the 2010 level flows were less than the 2000 level flows. This may be attributed to the more extensive accounting for diversions in the 2010 modified flow model which may have resulted in a representation of increased consumptive use in the basin. The differences in annual volume and monthly maximums and minimums for 1990-1999 (the last ten years of overlap in the two datasets) are presented in Table 3-2. The annual volumes for the 2000 dataset are 2 percent larger than the 2010 dataset on average. The annual maximums for 2000 are 9 percent larger than the 2010 dataset average. The annual minimums are 3 percent larger than the 2010 dataset average. Table 3-2: Yakima River at the Mouth, Comparison of the 2010 Modified Flows dataset to the 2000 Modified Flows dataset for years 1990-1999 (the last 10 years of overlap). Annual Volume Maximum Monthly Minimum Monthly 2010 2000 2010 2000 2010 2000

1990 2,062,791 2,319,583 376,927 407,603 81,806 92,600 1991 2,651,884 2,838,939 388,094 523,636 66,159 98,565 1992 1,581,474 1,608,186 286,308 285,241 54,301 67,894 1993 1,369,701 1,397,729 212,017 209,119 55,814 62,410 1994 1,113,171 1,099,074 177,509 184,879 32,600 35,786 1995 2,712,538 2,718,691 577,091 582,363 78,009 63,332 1996 4,616,781 4,458,876 983,101 881,331 90,941 95,798 1997 4,345,135 4,427,962 854,689 998,251 124,084 97,827 1998 2,844,421 2,883,664 527,540 600,303 91,705 90,387 1999 3,112,491 3,273,507 506,290 718,572 115,796 106,927

Averages 2,641,039 2,702,621 488,956 539,130 79,121 81,152 % differences 2% 9% 3%

Table 3-3 shows the comparison of the 2010 Modified Flows dataset to actual Yakima River at the Mouth flows using USGS data at Kiona and local diversions and inflows from Kiona to the mouth for years 1990-1999. The annual volumes for the 2010 dataset are 1 percent less than actual volume. The actual flows average monthly maximum is 1 percent less than then 2010 flow. The actual flows average monthly minimum is 4 percent larger than the 2010 flow. The differences in these datasets are considered reasonable.

3.0 Yakima River at the Mouth Modified Flows

21

Table 3-3: Comparison of the 2010 Modified Flows dataset to actual Yakima River at the Mouth flows using USGS data at Kiona and local diversions and inflows for the short distance from Kiona to the mouth for years 1990-1999. Annual Volume Maximum Monthly Minimum Monthly 2010 Actual* 2010 Actual* 2010 Actual*

1990 2,062,791 2,035,283 376,927 280,725 81,806 77,397 1991 2,651,884 2,713,079 388,094 443,671 66,159 83,849 1992 1,540,114 1,561,095 277,360 253,657 52,604 60,518 1993 1,369,701 1,445,456 212,017 225,194 55,814 60,738 1994 1,113,171 1,075,000 177,509 159,994 32,600 31,165 1995 2,712,538 2,862,274 577,091 588,934 78,009 73,716 1996 4,491,940 4,677,085 983,101 1,002,981 88,099 98,454 1997 4,345,135 4,345,135 854,689 854,689 124,084 124,084 1998 2,844,421 2,844,421 527,540 527,540 91,705 91,705 1999 3,112,491 3,112,491 506,290 506,290 115,796 115,796

Averages 2,624,418 2,667,132 488,062 484,368 78,667 81,742 % differences 1% 1% 4%

*Actual = USGS Yakima River at Kiona plus modeled local diversions and inflows. Figure 3-1 shows the comparison of the 2010 Modified Flows data set to the 2000 Modified Flows data set and actual flows for the Yakima River at the mouth. The 2000 data set extends from 1926 through 1999. The actual observed flow data set extends from 1934 through 2009 but overlapps with the 2010 data set from 1997 to 2009.

0

1000000

2000000

3000000

4000000

5000000

6000000

1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Yakima River at the Mouth, Annual Volumes, AF

Actual volume at Mouth 2010 Modified Volume 2000 Modified Volume Figure 3-1: 2010 Modified Flows data set compared with the 2000 Modified Flows data set and actual flows for the Yakima River at the Mouth, water years 1926-2009.

4.0 References

23

4.0 References U.S. Bureau of Reclamation (USBR) (November, 2002). Interim Comprehensive

Basin Operating Plan for the Yakima Project, Washington. Columbia-Cascades Area Office, Yakima, Washington.

This page is intentionally left blank

S

N

A

K

E

A

B

O

V

E

B

R

O

W

N

L

E

E

This page is intentionally left blank

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Office Boise, Idaho May 2010

Modified and Naturalized Flows of the Snake River Basin above Brownlee Reservoir

Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public.

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Office Boise, Idaho May 2010

Modified and Naturalized Flows of the Snake River Basin above Brownlee Reservoir prepared by River and Reservoir Operations Sharon Parkinson, P.E., Hydraulic Engineer

Contents

iii

Contents

Page 1.0  Introduction ............................................................................................... 1 

1.1  Geographic Scope ................................................................................. 2 1.1.1  General ............................................................................................ 2 1.1.2  Snake River ..................................................................................... 3 1.1.3  Boise River...................................................................................... 3 1.1.4  Payette River ................................................................................... 3 1.1.5  Owyhee River ................................................................................. 4 1.1.6  Major Tributaries ............................................................................ 4 

1.2  System Representation .......................................................................... 4 2.0  Model Development .................................................................................. 5 

2.1  Input Data.............................................................................................. 5 2.1  Water Balance ....................................................................................... 5 2.2  Aquifer Influence Computations ........................................................... 6 

2.2.1  Snake River above King Hill .......................................................... 6 2.2.2  Snake River below King Hill .......................................................... 9 2.2.3  Boise and Owyhee River Basins ..................................................... 9 2.2.4  Payette River Basin ......................................................................... 9 

2.3  Augmentation Delivery ......................................................................... 9 3.0  Model Calibration ................................................................................... 11 

3.1  Model Output ...................................................................................... 11 3.1  Augmentation Comparison ................................................................. 16 3.2  Calibration Summary .......................................................................... 17 

4.0  Modeling Modified Flows ....................................................................... 18 4.1.1  Model Configuration ..................................................................... 18 

4.1.1.1  Snake River above King Hill ............................................... 18 4.1.1.2  Snake River below King Hill ............................................... 18 4.1.1.3  Boise River ........................................................................... 18 4.1.1.4  Payette River ........................................................................ 19 

5.0  Modeling Naturalized Flow .................................................................... 20 5.1.1  Model Configuration ..................................................................... 20 

5.1.1.1  Snake River above King Hill ............................................... 20 5.1.1.2  Snake River below King Hill ............................................... 20 5.1.1.3  Boise River ........................................................................... 21 5.1.1.4  Payette River ........................................................................ 21 

6.0  Model Output .......................................................................................... 23 6.1  Modified Flow .................................................................................... 23 6.2  Naturalized Flow ................................................................................. 29 

7.0  Comparison of Modified Flows.............................................................. 36 8.0  Literature Cited ...................................................................................... 39 

List of Figures

Page

Figure 1-1:  Map of Snake River Basin, major tributaries, and reservoirs. ............. 2 Figure 2-1. From GIS indicating 20 groundwater zones and spatial location ......... 7 Figure 2-2. From Garabedian, USGS Professional Paper 1408-F designating 26

surface water irrigated areas ................................................................. 8 Figure 3-1. Comparison of annual volumes between modified flow model output

and historic data for the Snake River at King Hill. ............................. 12 Figure 3-1. Comparison of modified flow output and historic data for the Snake

River at King Hill................................................................................ 12 Figure 3-3. Comparison of modified flow output and historic data for the

summation of Federal Snake River reservoir storage contents above Milner. ................................................................................................. 12 

Figure 3-4. Comparison of modified flow output and estimated Brownlee inflow.............................................................................................................. 13 

Figure 3-5. Comparison of modified flow output and historic data for the Boise River near Parma................................................................................. 14 

Figure 3-6. Comparison of modified flow output and historic data for the summation of Boise River reservoir storage contents. ....................... 14 

Figure 3-7. Comparison of modified flow output and calculated historic data for the Payette River near the confluence of the Snake River. ................. 15 

Figure 3-8. Comparison of modified flow output and historic data for the summation of Payette River reservoir storage contents. ..................... 15 

Contents

v

List of Tables

Page

Table 3-2.  Volume and flow comparisons for the Snake River at King Hill ....... 13 Table 3-3.  Volume and flow comparisons of modified flow output and estimated

Brownlee inflow.................................................................................. 14 Table 3-4.  Volume and flow comparisons of modified flow output and historic

data for the Boise River near Parma ................................................... 15 Table 3-5.  Volume and flow comparisons of modified flow output and historic

data for the Payette River near the confluence with the Snake River. 16 Table 3-1.  Differences between modeled Modified Flow and historic average

monthly volumes at Brownlee Reservoir during augmentation the period, water years 1995 through 2008 ............................................... 16 

Table 6-1.  Modified flow into Brownlee Reservoir, water years 1928 – 2008 in (acre-feet per month). .......................................................................... 23 

Table 6-2.  Modified flow into Brownlee Reservoir, water years 1928 – 2008 in monthly average (cfs). ........................................................................ 26 

Table 6-3.  Naturalized flow into Brownlee Reservoir, water years 1928 – 2008 in (acre-feet per month). .......................................................................... 29 

Table 6-4: Naturalized flow into Brownlee Reservoir, water years 1928-2008 in monthly average (cfs). ........................................................................ 32 

Table 6-5.  Comparison of average volumes between Modified Flow and Naturalized Flow modeled output for period of records shown ......... 35 

Table 7-1: Comparison of the 2010 Modified Flows dataset to the 2000 Modified Flows dataset for years 1990-1999 (the last 10 years of overlap). ..... 36 

1.0 Introduction

1

1.0 Introduction Modified Flows, as computed by Reclamation for the Snake River Basin, are the historic stream flow sequences regulated to reflect what would have occurred with 2010 reservoir regulation and 2010 level demands. The Modified Flows produced by Reclamation are different from the Modified Flows produced by the Corps of Engineers (Corps) and Bonneville Power Administration (BPA) for other parts of the Columbia System. That is because the Columbia River system hydropower simulation models used by the Corps and BPA require unregulated modified stream flows as inputs at the areas of primary interest and incorporate regulated modified flows for the Deschutes, Yakima, and Snake River basins. The Corps and BPA do not attempt to simulate reservoir operations at Reclamation irrigation facilities on the tributaries to the Columbia River. Modified flows quantified in the Pacific Northwest by the Corps, BPA and Reclamation are used together as base line stream flows for analysis of future conditions, such as changes to the Federal Columbia River power system (FCRPS) due to operational or climatic changes. The “naturalized” flows into Brownlee Reservoir are defined as those flows that would be observed at this location without the cumulative influence of reservoir operations, irrigation, M&I diversions and groundwater pumping. This study presents model results from the naturalized and modified flow configurations in order to quantify the amount of water depletion occurring as a result of current diversion practices. This report describes the distribution modeling that was used to develop the 2010 Naturalized and Modified Flows for the Snake River Basin above Brownlee Reservoir.

1.0 Introduction

2

1.1 Geographic Scope

1.1.1 General The Snake River model comprises the Snake River Basin upstream of Brownlee Reservoir. The Snake River begins at its headwaters near Yellowstone National Park in Wyoming, turns west to the Idaho border, and flows northwest to its confluence with the Henrys Fork near Rexburg, Idaho. From that point, the river follows a southerly crescent across Idaho to the Idaho-Oregon border where it then turns north. The Boise, Payette, and Weiser Rivers in Idaho and the Owyhee, Malheur, Burnt, and Powder Rivers in Oregon join the Snake River along the Idaho-Oregon border before reaching Brownlee Reservoir (Figure 1-1).

Figure 1-1: Map of Snake River Basin, major tributaries, and reservoirs. Reclamation, Idaho Power Company, and a host of other organizations own and operate various facilities within the basin. These facilities have substantial influence on water resources, supplies, and the movement of surface and ground water through the region. Reclamation’s projects are primarily used as a supplemental water supply for irrigation, with authorities to also provide flood control and hydropower benefits. Operation of the projects is also in accordance with the endangered species requirements described in the Biological Opinions (BiOps) from the U.S. Fish and Wildlife Service and the National Marine Fisheries Service. Specific information on current reservoir operations can be

1.0 Introduction

3

found in the following citations: NMFS 2005, USBR 2004, USBR 2007, USFWS 2005. Reclamation holds title to the storage rights for all Reclamation storage facilities in the upper Snake above Milner, Owyhee Reservoir, as well as for facilities located in the Boise and Payette River Basins. Many irrigators use a combination of natural flows and reservoir storage for their surface water supply needs. Providing a sufficient amount of water in the river for in-stream flows, out-of-stream diversions, water rights, spaceholder contract provisions, and ESA stipulations requires a high degree of coordination among irrigators, storage operators, and State watermasters.

1.1.2 Snake River Federal dams operated by Reclamation in the Upper Snake River Basin above Milner include:

Jackson Lake Dam Island Park Dam Grassy Lake Dam Palisades Dam Ririe Dam American Falls Dam Minidoka Dam Little Wood Dam

Two reservoirs not operated by Reclamation, Henrys Lake and Blackfoot Reservoir are simulated in the model as representative of their current operations. Idaho Power owns and operates several facilities on the Snake River. However, these run-of-river projects are not included in the model network.

1.1.3 Boise River Federal dams operated by Reclamation in the Boise River Basin include:

Anderson Ranch Dam Arrowrock Dam Boise Diversion Dam Lake Lowell Dam

The U.S. Army Corps of Engineers operate Lucky Peak Dam, however, it is included in the model.

1.1.4 Payette River Federal dams operated by Reclamation in the Payette River Basin include:

Cascade Dam Deadwood Dam

1.0 Introduction

4

Black Canyon Dam Payette Lake is not operated by Reclamation, however, it is simulated in the model as representative of current operations.

1.1.5 Owyhee River The dam modeled on the Owyhee River is:

Owyhee Dam The Owyhee Irrigation District in coordination with the South Board of Control operates and maintains the project.

1.1.6 Major Tributaries Major tributaries are included in the model. Historic gage data are used for each of the following tributaries:

Bruneau River Big Wood River Malheur River Weiser River Burnt River Powder River

Reclamation’s dams on the Malheur and Powder Rivers are not included in the Snake River Basin model network. Data incorporated into the model for these tributaries include the historical effects of project operations.

1.2 System Representation

A model network of the Snake River Basin was developed to represent Reclamation’s projects within this geographic scope. The network was calibrated using historic data such that preservation of the system mass balance was accomplished. Maintaining water mass balance and depicting 2010 level basin development within the model configuration were necessary for an acceptable representation of the Modified Flow and the Naturalized Flow scenarios. Manipulation of historic inflows into Brownlee reservoir would not have been an appropriate depiction of operational protocols or of the cumulative irrigation effects. Therefore, a modeling tool was configured to manage the hydrograph for the period of record, water years 1928 through 2008, in order to capture current operational constraints, irrigation demands, irrigation influences to the river and aquifer, as well as to quantify augmentation deliveries at Brownlee Reservoir.

2.0 Model Development

5

2.0 Model Development This section discusses the Upper Snake River basin model development undertaken for this Naturalized and Modified Flow Study. In order to quantify inflows to Brownlee Reservoir under varying hydrologic conditions, the Snake River MODSIM Model, version 8.1 was used. MODSIM is a general-purpose river and reservoir operations computer simulation model. The MODSIM model network of the Snake River Basin was developed to replicate historical data and system operations over the 1928 – 2008 historical water supply period of record. Once this calibration process was completed, two networks were configured to represent a “Modified Flow” and “Naturalized Flow” condition in order to quantify the depleted flows in the Snake River. The following describes the development of the Snake River Basin model and configuration assumptions.

2.1 Input Data

A complete hydrology data set from 1928 through 2008 was not available for the entire basin. Available historical streamflow records were obtained from U.S. Geological Survey (USGS), Idaho Department of Water Resources (IDWR) and Reclamation; and available diversion records were provided by IDWR and Reclamation data bases. Based on the historical data, correlations were developed to fill in and extend periods of unrecorded data in order to provide a complete data input record from 1928 through 2008 for use in the model. The State of Idaho’s water right records were consulted to determine surface water diversion priority dates. Several diversion records were complete for the period of record modeled. For diversion records that were not complete, diversion data were filled to the stipulated water right year using correlations. If no water right record was found, infill correlations were not developed and the data record was not modified. Historical end of month reservoir contents were also collected for input into the water balance calculation. Many reservoirs were constructed after 1928. Therefore, only data since reservoir construction were used in the water balance exercise.

2.1 Water Balance

Once data infill had been completed using the correlation calculations, a mass balance of the entire Snake River Basin was accomplished using the MODSIM

2.0 Model Development

6

Model. This water balance exercise or “Unregulated Model” computed unmeasured local gains and depletions for various reaches, or sections of the river. The basic mass balance equation utilized in this process is as follows: Equation 1 Unregulated Local Reach Gain = Downstream gage – Upstream

gage + historical diversions – short term return flow + change in reservoir storage + reservoir evaporation

Short term return flow, in Equation 1 above, has a very specific meaning. This term represents the portion of surface water diversion that returns to the river without interacting with the regional aquifer. This amount of the diversion returns to the river in a matter of a few months. This parameter is used to represent wasteway flows, surface drain flows, and shallow soil interflow back to the river. It does not represent the total amount of surface water diversion that ultimately returns to the river through the aquifer. The mass balance exercise computed unmeasured local gains and depletions for various reaches, or sections of the river. The groundwater influence of this return flow, that water that influences the river through the aquifer, was contained in the unregulated gain calculations. In addition, the influence of groundwater pumping to the river reach was also contained within these unregulated gain calculations. The following paragraphs describe how the aquifer influence of surface water irrigation and groundwater irrigation were partitioned out of unregulated gain values.

2.2 Aquifer Influence Computations

2.2.1 Snake River above King Hill Separate computations were performed to incorporate the impact of groundwater pumping and surface water diversions to the aquifer. Over the years, surface water irrigation has provided aquifer recharge, while development of groundwater irrigation has depleted aquifer storage. In some cases, the influence of aquifer recharge and depletion can take decades before impacts to the river are fully realized. The aquifer interaction in the reach upstream of King Hill on the Eastern Snake River Plain Aquifer, required additional computations in an attempt to quantify this influence. The Idaho Water Resources Research Institute (IWRRI) developed a MODFLOW groundwater model of the East Snake Plain Aquifer Basin (ESPAB) and delineated it into 20 groundwater zones (Johnson 1999). Garabedian (Garabedian 1992) delineated 26 surface water irrigated areas. The response functions were developed for both the defined groundwater zones and surface water irrigated areas within the Eastern Snake Plain model boundary (Cosgrove 2006).

2.0 Model Development

7

Figure 2-1 presents the various groundwater zones defined in the model. These designations originated from the IWRRI groundwater model. Garabedian’s 26 areas are presented in Figure 2-2.

Figure 2-1. From GIS indicating 20 groundwater zones and spatial location

2.0 Model Development

8

Figure 2-2. From Garabedian, USGS Professional Paper 1408-F designating 26 surface water irrigated areas There are eleven reaches on the Snake River that are recognized as places where the river and aquifer are hydraulically connected. A unit stress was applied to each MODFLOW model cell within each zone or area, and the model was run until the volume of water applied during the stress period returned to the reaches of the Snake River. A hydrograph was then developed for each reach of the Snake River representing the volume of water that returned over all timesteps. For surface water diversions, the methodology used to capture the aquifer effect included calculating the difference between the volumes of water diverted and the volumes that were consumptively used. In many project areas, some of the water diverted is returned to the river without interacting with the regional aquifer. This amount returns to the river, typically within a few months via wasteways, surface drains, and shallow soil interflow. The diverted surface water that infiltrates into the regional aquifer ultimately returns to the river, usually over a long period of time. Therefore, the aggregated MODFLOW response functions compute this lagged return flow of water to the river for incorporation into the MODSIM network analyses. In computing the response to the aquifer due to groundwater pumping, it was assumed 100 percent of the groundwater pumped had been consumptively used with no conveyance losses.

2.0 Model Development

9

The algebraic sum of the surface water irrigation and groundwater irrigation influences represents the historical influence of irrigation on the aquifer and the Snake River. The surface water response was considered positive, or a recharge to the aquifer, whereas the groundwater response was considered negative, or a depletion of the aquifer. These historic influences from all of the areas and zones are then summed for each of the eleven reaches as defined in the groundwater model. This response was included in the MODSIM networks. In addition, a 2010 current irrigation influence reach adjustment was created to represent the present and future conditions of irrigation practices utilized in the Modified Flow network.

2.2.2 Snake River below King Hill Information was not available to segregate the long term irrigation influences to the Snake River below King Hill. It was assumed that this influence was negligible. Therefore, the reach gains were not adjusted.

2.2.3 Boise and Owyhee River Basins Information was not available to segregate the long term influences associated with historical irrigation along the Boise or Owyhee River. Therefore, the reach gains were not adjusted using response functions.

2.2.4 Payette River Basin The historical influence of the surface water return flow to the Payette River was removed from the Modified Flow model network. Lag coefficients and infiltration rates were used to compute this return flow resulting from historic diversions. Irrigation influence as a result of historic diversions was computed during the mass balance exercise. In order to quantify return flows resulting from current irrigation practices, the lag coefficients and infiltration rates used to develop the historical irrigation impact were incorporated. This influence of the current level of diversions was represented in the Modified Flow model network.

2.3 Augmentation Delivery

The 2008 BiOp requires up to 487,000 acre feet of water be delivered to Brownlee Reservoir in order to benefit the spring and early summer fall Chinook migrants. If power head space was needed to provide augmentation water, then the maximum augmentation volume that would be provided was 427,000 acre-feet. This would typically occur in drier water type years (NMFS 2008). In general, augmentation storage releases were made primarily during May through July. Some storage releases may occur in August as a result of water year type or operational constraints. Natural flow rights counted towards augmentation were provided in the April through August period.

2.0 Model Development

10

Rental water is a substantial portion of the total augmentation water identified in the system. Actual augmentation volumes are predicated on the assumption that a willing seller of reservoir storage water exists. The model attempted to capture the historic pattern of those districts that rented water to Reclamation for flow augmentation. It was assumed that the historic distribution and quantity rented to Reclamation would continue in the future under the Modified Flow configuration. Competition for water in the form of managed groundwater recharge or climate variability influences on the Snake River basin have not been determined and are not included in the model networks.

3.0 Model Calibration

11

3.0 Model Calibration The MODSIM model networks were populated with the reach gains and losses produced by the unregulated model network. In addition, aquifer influences were also incorporated into the model networks. Once this was completed, the network was configured with current operation practices for comparison to historic data. It is important to note that varying hydrologic conditions and numerous other factors influence the way reservoirs are managed. Daily operations of the projects are influenced by many factors, including recent precipitation, reservoir content at the beginning of the irrigation season, spatial water supply distribution, temperature, irrigation demand, special operating requests, or emergency situations. Therefore, when model output is compared to historical data, differences are present because the model is incapable of predicting the day-to-day decisions made on a real-time basis. While the monthly time-step of the model output does not capture the variations of day-to-day circumstances and real-time operational decisions, the MODSIM model output successfully represents the historic conditions. The following section presents model output and historic data comparisons.

3.1 Model Output

The Federal reservoir system was not fully developed for the entire period of record modeled under the modified flow configuration for water year 1928 through water year 2008. The model network was configured to represent the current level of system resource development and operations. When model output was compared to the historic period of record, differences were apparent. Figure 3-2 illustrates the impact of historical groundwater pumping on the aquifer influence to the Snake River. This is shown by the initial annual output volumes produced by the model as being less than historic, gradually converging to historic volumes in the most recent years.

3.0 Model Calibration

12

Figure 3-1. Comparison of annual volumes between modified flow model output and historic data for the Snake River at King Hill. A comparison between the model output and historical data was made between water years 1995 through 2008. This 13-year period of record was chosen as it is most likely to represent the current level of system resource development and operations for confirmation of model constraints and configurations. The following figures and table illustrate the comparison of model output and historic data for the Snake River at King Hill.

Figure 3-2. Comparison of modified flow output and historic data for the Snake River at King Hill.

Figure 3-3. Comparison of modified flow output and historic data for the summation of Federal Snake River reservoir storage contents above Milner.

‐

2,000,000 

4,000,000 

6,000,000 

8,000,000 

10,000,000 

12,000,000 

14,000,000 

1928 1933 1938 1943 1948 1953 1958 1963 1968 1973 1978 1983 1988 1993 1998 2003 2008

Annual V

olume (acre‐feet)

Year

Snake River above King Hill:  Annual Total Volume 1928 ‐ 2008

Modified Flow

Historic

‐

5,000 

10,000 

15,000 

20,000 

25,000 

30,000 

35,000 

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Flow (cfs)

Year

Snake River at King Hill:  Monthly Average 1995 ‐ 2008

Modified Flow

Historic

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000

4,500,000

5,000,000

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Volume (acre‐feet)

Year

Snake River Storage:  Jackson, Palisades, Henrys Lake, Island Park,Grassy Lake, Ririe, American Falls, Lake WalcottMonth Ending Storage 1995 ‐ 2008

Modified Flow

Historic

3.0 Model Calibration

13

Table 3-1. Volume and flow comparisons for the Snake River at King Hill

Water Year

Annual Volume (acre-feet) Average Flow (cfs) Maximum Flow (cfs) Minimum Flow (cfs)

Modified Flow Historic

Modified Flow Historic

Modified Flow Historic

Modified Flow Historic

1995 6,054,031 6,447,900 8,377 8,903 14,695 16,017 6,348 6,754

1996 8,509,901 9,165,600 11,763 12,645 19,027 23,187 7,123 8,506

1997 10,371,483 12,251,100 14,384 17,017 25,376 32,144 7,421 8,540

1998 9,663,056 10,127,800 13,373 13,994 23,923 19,404 6,720 8,745

1999 9,264,347 9,995,300 12,843 13,825 21,730 19,520 7,791 8,538

2000 6,389,800 7,254,000 8,807 9,991 12,217 13,668 6,192 7,289

2001 5,588,120 5,308,400 7,727 7,331 10,139 9,324 5,979 6,400

2002 5,048,312 4,994,700 6,975 6,900 7,425 7,400 5,928 6,062

2003 4,894,437 4,811,400 6,761 6,645 7,600 7,727 5,850 5,733

2004 4,901,607 4,733,100 6,754 6,521 7,336 7,058 5,483 5,572

2005 4,816,588 4,893,300 6,653 6,756 7,280 7,232 5,643 6,400

2006 6,532,455 6,789,900 9,016 9,383 19,456 18,612 6,083 6,831

2007 5,326,616 5,402,300 7,359 7,462 10,658 9,104 5,915 6,448

2008 5,645,297 5,141,200 7,789 7,076 11,947 8,745 5,677 6,467

Average 6,643,289 6,951,143 9,184 9,603 14,201 14,224 6,297 7,020

The following figure and table illustrate the comparison of model output and estimated Brownlee inflow data. Instruments have not been installed that directly record the flow into Brownlee Reservoir. Therefore, the inflow is estimated using available gage data along the Snake River and reservoir contents after construction.

Figure 3-4. Comparison of modified flow output and estimated Brownlee inflow.

‐

10,000 

20,000 

30,000 

40,000 

50,000 

60,000 

70,000 

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Flow (cfs)

Year

Brownlee Inflow:  Monthly Average 1995 ‐ 2008

Modified Flow

Historic

3.0 Model Calibration

14

Table 3-2. Volume and flow comparisons of modified flow output and estimated Brownlee inflow

Water Year

Annual Volume (acre-feet) Average Flow (cfs) Maximum Flow (cfs) Minimum Flow (cfs)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

1995 12,651,643 12,450,100 17,495 17,202 35,313 35,205 9,503 10,340

1996 17,866,325 18,542,900 24,690 25,611 39,268 49,018 11,363 12,061

1997 22,286,762 23,981,300 30,894 33,286 50,794 52,583 12,277 13,234

1998 17,509,576 17,819,300 24,204 24,613 53,146 50,420 10,623 11,954

1999 17,435,221 17,836,700 24,144 24,664 44,711 41,451 11,910 12,699

2000 11,343,452 12,032,100 15,661 16,600 28,369 27,228 7,958 9,958

2001 7,804,078 7,541,700 10,789 10,418 14,558 13,583 6,577 7,200

2002 8,698,403 8,181,900 12,022 11,308 18,390 16,412 9,100 7,839

2003 8,431,877 8,713,400 11,657 12,044 18,020 17,696 7,249 8,119

2004 8,525,493 8,193,200 11,750 11,291 16,737 16,109 8,362 8,122

2005 7,873,598 7,932,400 10,861 10,943 20,505 20,295 8,046 8,231

2006 15,132,197 16,290,600 20,901 22,532 54,452 61,014 6,984 10,820

2007 8,176,819 8,224,600 11,302 11,365 18,973 13,897 6,677 8,592

2008 10,005,026 9,439,900 13,792 12,996 25,569 23,154 8,082 10,181

Average 12,410,034 12,655,721 17,155 17,491 31,343 31,291 8,908 9,953

The following figures and table illustrate the comparison of model output and historic data for the Boise River near Parma.

Figure 3-5. Comparison of modified flow output and historic data for the Boise River near Parma.

Figure 3-6. Comparison of modified flow output and historic data for the summation of Boise River reservoir storage contents.

‐

1,000 

2,000 

3,000 

4,000 

5,000 

6,000 

7,000 

8,000 

9,000 

10,000 

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Flow (cfs)

Year

Boise River near Parma:  Monthly Average 1995 ‐ 2008

Modified Flow

Historic

0

200,000

400,000

600,000

800,000

1,000,000

1,200,000

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Volume (acre‐feet)

Year

Boise River Storage: Anderson Ranch, Arrowrock, Lucky Peak ReservoirsMonth Ending Storage 1995 ‐ 2008

Modified Flow

Historic

3.0 Model Calibration

15

Table 3-3. Volume and flow comparisons of modified flow output and historic data for the Boise River near Parma

Water Year

Annual Volume (acre-feet) Average Flow (cfs) Maximum Flow (cfs) Minimum Flow (cfs)

Modified Flow Historic

Modified Flow Historic

Modified Flow Historic

Modified Flow Historic

1995 1,255,947 1,066,600 1,730 1,468 4,849 4,552 735 668

1996 2,112,261 2,140,900 2,917 2,959 6,866 7,143 509 978

1997 2,764,430 2,759,100 3,847 3,839 8,043 7,915 902 997

1998 1,487,937 1,559,800 2,056 2,155 6,881 5,929 287 873

1999 1,632,724 1,617,600 2,275 2,237 4,949 7,286 513 842

2000 966,277 893,100 1,334 1,232 4,213 3,032 297 691

2001 374,873 486,500 517 672 813 1,171 202 337

2002 448,562 505,000 619 698 1,201 854 188 520

2003 557,223 586,400 766 810 2,308 867 243 677

2004 690,964 635,900 952 877 2,397 1,229 287 645

2005 454,731 537,600 626 742 1,332 1,025 273 452

2006 1,556,993 1,781,100 2,157 2,475 6,939 6,772 315 774

2007 479,298 548,800 663 758 1,376 934 266 576

2008 722,089 696,000 992 956 3,681 2,688 286 662

Average 1,107,451 1,129,600 1,532 1,563 3,989 3,671 379 692

The following figures and table illustrate the comparison of model output and calculated historic data for the Payette River near the confluence with the Snake River.

Figure 3-7. Comparison of modified flow output and calculated historic data for the Payette River near the confluence of the Snake River.

Figure 3-8. Comparison of modified flow output and historic data for the summation of Payette River reservoir storage contents.

‐1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 

10,000 11,000 12,000 13,000 14,000 15,000 

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Flow (cfs)

Year

Payette River near the confluence:  Monthly Average 1995 ‐ 2008

Modified Flow

Historic

100,000

200,000

300,000

400,000

500,000

600,000

700,000

800,000

900,000

1,000,000

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008

Volume (acre‐feet)

Year

Payette River Storage: Deadwood and Cascade ReservoirsMonth Ending Storage 1995 ‐ 2008

Modified Flow

Historic

3.0 Model Calibration

16

Table 3-4. Volume and flow comparisons of modified flow output and historic data for the Payette River near the confluence with the Snake River.

Water Year

Annual Volume (acre-feet) Average Flow (cfs) Maximum Flow (cfs) Minimum Flow (cfs)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

Modified Flow

Historic (calculated)

1995 2,885,866 2,540,264 4,005 3,411 10,688 9,382 346 485

1996 3,641,458 3,583,608 5,040 4,849 11,332 11,004 713 756

1997 4,257,961 4,056,126 5,892 5,519 12,197 11,371 344 798

1998 2,762,235 2,517,227 3,819 3,376 11,664 10,200 750 839

1999 2,997,345 2,783,125 4,139 3,750 11,006 9,307 657 664

2000 1,925,676 1,861,733 2,683 2,461 6,259 5,374 541 1,012

2001 953,285 874,100 1,328 1,117 2,112 1,890 553 343

2002 1,628,550 1,439,996 2,260 1,898 5,833 4,235 459 805

2003 1,689,205 1,928,986 2,345 2,574 6,717 6,586 246 714

2004 1,435,118 1,558,859 1,982 2,057 4,319 4,126 372 789

2005 1,272,486 1,401,894 1,758 1,841 5,256 5,411 321 783

2006 2,871,860 3,132,123 3,964 4,242 11,529 11,845 610 1,000

2007 1,341,543 1,385,200 1,859 1,819 3,380 3,448 390 743

2008 1,930,822 2,103,757 2,663 2,802 8,455 8,015 445 751

Average 2,256,672 2,226,214 3,124 2,980 7,911 7,300 482 749

3.1 Augmentation Comparison

The 2010 Modified Flows model logic incorporated the shift in flow augmentation water delivery to earlier in the season. Water year 2009 was the first year augmentation delivery occurred in accordance with the 2007 BA proposed shift. The model output data for the period of record analyzed (1928 through 2008) will not be directly comparable to the historic data as a result. The following table illustrates that differences are apparent between the model output and historic data during the augmentation months. Table 3-5. Differences between modeled Modified Flow and historic average monthly volumes at Brownlee Reservoir during augmentation the period, water years 1995 through 2008

Model Network

Brownlee Reservoir Inflow Monthly Average Volume (1995 – 2008)

May (acre-feet)

June (acre-feet)

July (acre-feet)

August (acre-feet)

Historic Data 1,459,321 1,207,889 650,442 613,979

Modified Flow 1,475,859 1,277,209 655,658 535,232

Difference 16,537 69,319 5,216 (78,747)

3.0 Model Calibration

17

Output from the modified flow network, when compared to historic volumes illustrates that the model shifted augmentation delivery to earlier in the season.

3.2 Calibration Summary

The MODSIM model output shows that the model successfully represents current conditions. Differences are apparent between modeled and historic data. However, the model output captures the complicated constraints and operational protocols that are representative of the entire system for comparative analysis.

4.0 Modeling Modified Flows

18

4.0 Modeling Modified Flows 4.1.1 Model Configuration Reclamation’s modified flow model network can be described as the calibrated model network under current surface water diversion development, current level of groundwater pumping, and proposed reservoir operation protocol. Operation of the dams was defined in the model in accordance with the requirements of the BiOps (USFWS 2005, NMFS 2008).

4.1.1.1 Snake River above King Hill The removal of historical irrigation influences and the addition of 2010 irrigation influences to the aquifer were incorporated in the MODSIM model network. This was done in order to characterize flow conditions in the Snake River above King Hill as representative of current practices under the Modified Flow scenario.

The Big Wood River was included in the model as a single node of historic gage data. This tributary volume was relatively small when compared to the Snake River. It was also assumed for the Modified Flow scenario that any changes to the regulation of the Big Wood River would be minimal.

4.1.1.2 Snake River below King Hill Information was not available to segregate the long term irrigation influences to the Snake River reach below King Hill. It was assumed that this influence was negligible. Therefore, the reach gains were left unadjusted. The following tributaries were included in the model, represented by historic gage data. Their tributary volume was relatively small when compared to the Snake River and these basins were not modeled in detail with the MODSIM model.

Weiser River Bruneau River Malheur River Burnt River Powder River

It was also assumed for the Modified Flow scenario that any changes to the regulation of these tributaries would be minimal. Therefore, the historical data for these tributaries was used in this scenario.

4.1.1.3 Boise River Information was not available to segregate the long term irrigation influences to groundwater flows affecting this reach. Therefore, the reach gains, containing

4.0 Modeling Modified Flows

19

long term irrigation influences were left unadjusted in the network representing the Boise River.

4.1.1.4 Payette River This historical irrigation influence to the Payette was removed from these reaches in the model for the Modified Flow model network. It was then assumed that the current irrigation influences that returned to the reaches, under the Modified Flow scenario, would be represented by the same lag coefficients and infiltration rates used in development of the historical influence. Therefore, an attempt was made to differentiate the historical influences from the current influences to the Payette River due to irrigation. This was incorporated into the model network of the Payette River.

5.0 Modeling Naturalized Flow

20

5.0 Modeling Naturalized Flow 5.1.1 Model Configuration The Naturalized Flow Scenario can be described as a calibrated model network with the removal of surface water diversions, groundwater pumping, and reservoir operations. Model output represents the flows that would have occurred in the river without reservoir regulation or irrigation demands. This modeling effort is an attempt to remove the lagged effects of current and past surface and groundwater irrigation practices in representing the natural hydrograph entering Brownlee Reservoir.

5.1.1.1 Snake River above King Hill To represent a naturalized flow condition, surface irrigation diversions and the existence of reservoirs were removed for the Snake River above King Hill model network. Similar to the Modified Flow configuration, the influence of historical irrigation practices, as a result of both surface water diversions and groundwater pumping, on the aquifer were also removed. The Big Wood River was not unregulated for the naturalized flow scenario. Not enough information about this reach is available to derive an unregulated water supply data set, and therefore, was not truly “naturalized,” by definition. This tributary was relatively small when compared to the Snake. It should also be noted that the groundwater response functions, used in this scenario for above King Hill, were not modified from the IWRRI groundwater model. Although the groundwater model was developed with information under current irrigation and land use practices, those response functions were assumed to be the same under the naturalized flow condition. At this time, it is uncertain as to the interaction of the aquifer with the river reach if all irrigation and diversion practices were halted. Therefore, the current groundwater model response functions of aquifer behavior were input into the MODSIM model until additional information becomes available.

5.1.1.2 Snake River below King Hill Information was not available to segregate the long term irrigation influences to this reach. It was assumed that this influence was negligible and as a result the reach gains were left unadjusted. Additionally, for the naturalized flow configuration, all diversions and reservoirs were removed. It should also be noted that several tributaries to the Snake River below King Hill were not unregulated for the naturalized flow scenario. Not enough information

5.0 Modeling Naturalized Flow

21

about these reaches is available to derive an unregulated water supply data set, and therefore, are not truly “naturalized,” by definition. These tributaries are also relatively small when compared to the Snake River. These tributaries are:

Weiser River Malheur River Bruneau River Burnt River Powder River

5.1.1.3 Boise River Information was not available to segregate the long term irrigation influences to this reach. Therefore, the reach gains for both the proposed action and the “naturalized” flow model configuration were left unadjusted. Additionally, for the naturalized flow configuration, all diversions and reservoirs were removed to create an unregulated system on the Boise River. Outside of the model run, groundwater pumping influences were removed from the naturalized flow hydrograph produced in MODSIM. Groundwater irrigated acreages were obtained annually between 1958 and 1997. In addition, monthly groundwater pumping estimates were available for 1997. The groundwater pumping total includes agricultural irrigation as well as the DCMI (domestic, commercial, municipal and industrial) consumptive use (USBR 2006). The groundwater pumping was held constant between 1997 and 2008, at approximately 211,000 acre-feet annually, and partitioned based on acreage percent, to 1958. These volumes were then added to the naturalized hydrograph.

5.1.1.4 Payette River This historical irrigation influence to the Payette was removed from the model for the Naturalized model network. Additionally, for the naturalized flow configuration, all diversions and reservoirs were removed to create an unregulated system on the Payette River.

6.0 Model Output

23

6.0 Model Output

6.1 Modified Flow

MODSIM model output for inflow to Brownlee Reservoir is presented in the following tables. Table 6-1. Modified flow into Brownlee Reservoir, water years 1928 – 2008 in (acre-feet per month).

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928

957,806

1,437,969

916,439

1,203,469

954,668

1,514,998

1,329,165

2,702,734

1,366,513

680,006

558,392

545,697

1929

584,827

705,863

665,276

855,559

656,541

1,026,747

811,554

1,200,205

915,725

551,782

547,163

465,340

1930

513,849

606,970

669,840

670,493

922,355

841,179

735,691

751,158

669,468

508,846

471,468

451,478

1931

546,355

599,991

613,303

608,697

509,534

708,176

497,803

423,648

287,300

282,700

327,383

346,222

1932

575,501

635,180

645,787

621,870

700,668

1,549,713

1,266,758

1,657,439

1,410,348

624,070

471,631

488,947

1933

556,744

680,896

627,394

601,583

541,057

935,125

824,618

844,029

1,609,849

639,372

483,092

481,062

1934

553,111

685,387

720,793

797,309

650,051

731,750

683,214

373,572

291,348

285,900

304,195

355,649

1935

487,477

621,884

627,847

608,833

546,919

753,516

835,818

833,904

798,444

699,915

483,640

464,336

1936

519,298

618,990

595,555

657,433

699,452

869,130

1,577,572

1,665,481

1,215,516

847,300

446,773

497,387

1937

560,190

658,484

647,883

592,188

541,024

719,430

700,221

702,236

583,305

361,610

364,302

433,366

1938

568,965

716,901

922,917

789,453

879,081

1,951,215

2,284,242

2,114,528

1,777,510

803,149

535,409

576,490

1939

700,384

752,076

710,147

805,674

726,094

1,453,682

1,367,703

965,871

473,894

383,608

411,701

479,231

1940

560,635

748,869

775,612

773,655

997,962

1,470,399

1,439,995

1,089,210

629,489

396,614

428,856

556,365

1941

639,722

770,694

764,778

761,708

870,018

1,103,443

776,654

918,186

1,011,912

484,800

533,084

548,678

1942

660,145

826,548

949,604

832,019

906,955

1,062,264

1,797,834

1,197,208

1,211,709

969,065

542,684

579,318

1943

623,342

841,899

940,101

1,770,467

1,589,205

2,375,545

3,764,431

1,803,880

1,882,748

1,181,178

667,548

702,890

1944

823,070

870,890

908,008

787,477

778,912

875,015

765,772

709,948

879,520

593,620

573,013

537,865

1945

632,374

763,907

694,879

868,375

1,036,348

1,095,636

779,787

1,480,232

1,578,859

768,000

550,166

629,582

1946

689,705

980,144

1,043,658

1,220,874

1,034,225

2,147,261

2,700,330

1,834,179

1,121,117

902,700

590,794

618,354

1947

741,786

969,084

1,176,092

935,102

1,099,237

1,434,734

1,180,104

1,680,220

1,333,803

757,228

574,396

587,658

1948

694,822

750,110

873,172

1,129,072

907,344

948,905

1,089,810

1,660,095

1,946,656

760,074

570,400

571,256

1949

666,003

701,477

683,578

753,664

940,001

1,493,579

1,354,997

2,124,854

1,237,643

624,721

543,725

527,453

1950

662,745

730,998

738,830

1,024,565

1,091,916

1,571,939

1,830,656

1,333,875

2,067,099

940,083

637,472

670,726

1951

830,161

1,065,215

1,178,987

1,271,527

1,694,091

1,508,377

2,155,335

1,856,219

1,497,619

730,342

625,595

637,778

1952

1,124,827

1,112,221

1,122,089

1,581,105

1,482,260

1,606,577

3,865,016

3,227,769

2,055,000

854,778

590,884

611,229

1953

701,328

713,789

750,911

1,442,563

1,086,721

1,148,369

1,174,007

1,335,064

2,682,163

885,389

595,013

581,922

6.0 Model Output

24

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1954

702,385

808,174

751,638

989,945

1,022,452

1,304,368

1,369,813

1,588,436

1,193,189

726,182

629,162

564,264

1955

655,806

765,091

717,299

829,235

728,550

716,360

786,395

1,028,562

1,158,336

675,866

533,105

508,270

1956

619,309

752,716

1,311,355

1,757,570

1,466,820

1,892,914

2,314,565

1,842,933

2,203,656

743,450

630,843

649,447

1957

799,843

862,465

828,952

1,134,048

1,525,020

1,943,476

1,657,111

2,579,193

2,338,120

733,087

612,413

663,696

1958

767,059

732,400

941,790

1,143,945

1,442,504

1,341,801

1,618,399

2,725,542

1,465,881

583,791

557,533

586,080

1959

794,598

963,710

951,085

1,059,697

820,775

971,672

865,019

961,994

1,272,464

702,984

630,617

733,708

1960

789,500

738,911

727,878

688,259

821,760

1,189,738

1,227,306

953,958

876,272

456,257

512,340

511,589

1961

653,766

800,006

708,847

602,403

772,644

787,342

630,571

663,068

713,264

373,340

347,506

461,475

1962

594,516

685,923

686,239

719,386

989,917

1,044,414

1,631,662

1,361,226

1,370,244

641,846

568,713

576,582

1963

790,348

808,351

881,011

742,850

1,229,982

953,782

960,035

1,300,775

1,846,116

705,314

533,583

605,099

1964

660,368

771,981

734,904

686,281

631,403

1,025,890

1,360,730

1,320,417

2,345,346

757,769

566,546

654,260

1965

721,233

787,885

1,651,228

2,327,854

2,227,772

1,998,350

1,997,260

2,026,774

2,378,410

920,053

806,561

771,972

1966

851,855

826,221

888,095

1,019,797

871,759

945,926

964,041

724,522

649,190

459,924

428,305

500,753

1967

637,194

744,807

879,417

986,975

886,681

1,072,254

761,583

1,049,231

2,187,001

794,088

572,331

579,032

1968

750,413

794,801

791,547

1,042,541

1,041,632

1,118,785

733,433

704,155

1,449,452

559,215

562,013

556,409

1969

730,864

813,996

768,547

1,564,814

1,194,829

1,324,726

2,453,087

2,507,195

1,393,497

667,780

598,722

597,465

1970

735,556

730,351

847,094

1,691,842

1,171,836

1,306,962

804,876

1,854,340

2,589,711

919,718

644,722

778,501

1971

801,262

1,112,270

1,080,980

2,524,728

2,162,205

2,380,978

2,624,215

2,752,076

2,702,125

1,148,851

694,468

730,288

1972

1,342,754

1,169,156

1,237,248

2,056,519

1,792,620

3,325,289

2,035,770

1,842,578

2,728,127

803,539

665,418

782,220

1973

1,230,751

1,127,358

1,136,315

1,158,652

950,947

1,072,500

948,475

1,349,695

1,150,902

608,415

558,088

627,623

1974

736,560

1,233,303

1,176,372

1,953,831

1,537,238

2,334,127

2,691,589

1,951,619

2,662,260

1,025,723

712,537

693,892

1975

882,037

937,557

1,065,699

1,282,908

1,303,726

1,537,465

1,792,192

1,879,257

2,923,306

1,177,196

784,852

734,297

1976

1,449,429

1,053,000

1,312,103

1,433,769

1,334,586

1,523,548

2,277,706

2,339,175

1,744,034

750,790

777,637

1,015,551

1977

1,088,955

907,787

843,610

899,229

775,637

737,927

360,681

423,796

385,111

313,155

363,099

428,769

1978

600,744

663,480

861,092

928,607

1,012,537

1,593,407

1,900,556

1,608,688

1,404,066

817,697

630,151

740,313

1979

760,008

840,695

718,543

1,071,563

1,105,113

1,150,138

865,124

1,241,332

675,332

521,454

526,617

560,279

1980

610,982

664,438

657,549

942,844

1,056,054

1,201,523

1,341,343

2,175,495

1,797,437

669,624

520,938

690,669

1981

652,686

713,073

878,241

926,813

1,105,092

1,082,218

964,226

958,646

1,051,656

583,659

521,830

545,242

1982

648,799

724,068

952,458

1,351,739

2,237,542

2,346,429

2,298,735

2,373,254

2,045,508

1,245,688

713,032

794,067

1983

1,155,773

1,029,380

1,365,598

1,987,980

2,024,356

3,390,468

1,946,611

3,080,406

2,854,453

1,212,222

777,764

731,060

1984

1,341,243

1,349,398

1,526,668

1,919,657

1,808,808

3,192,079

3,199,996

3,403,261

3,343,184

1,094,845

929,948

1,010,620

1985

1,209,729

1,267,141

1,056,470

1,216,619

1,125,800

1,362,094

2,239,627

1,665,844

775,048

478,095

465,440

921,291

1986

1,069,221

1,203,230

1,041,158

1,816,386

2,933,174

3,507,542

2,867,294

2,007,891

1,797,204

781,240

638,285

830,973

1987

892,304

1,013,761

1,033,197

860,524

839,917

1,012,573

778,037

642,929

542,765

489,350

461,507

506,281

1988

609,736

707,682

760,456

813,010

778,081

818,082

842,027

609,223

546,427

382,403

375,938

457,799

1989

544,078

694,868

700,015

637,327

683,152

1,486,298

1,755,846

1,291,631

876,009

600,958

504,775

589,451

1990

712,555

700,610

686,472

665,913

565,510

871,759

798,773

687,732

755,362

585,852

512,441

496,282

6.0 Model Output

25

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1991

629,054

663,853

658,156

648,936

612,231

634,181

607,950

737,104

730,080

568,058

510,094

494,610

1992

606,393

672,606

681,480

616,422

703,595

646,465

508,258

423,155

297,277

280,200

277,300

342,965

1993

506,008

600,188

601,458

632,717

601,311

1,654,628

1,461,691

1,695,935

1,582,709

745,929

641,978

646,881

1994

704,022

663,449

680,407

700,891

663,593

848,508

760,266

792,787

526,279

449,395

403,761

438,363

1995

584,343

610,554

699,742

838,189

883,797

1,267,988

1,508,903

1,947,019

2,101,271

885,319

665,506

659,012

1996

719,507

721,708

1,081,918

1,832,434

2,169,064

2,322,062

2,223,304

2,107,936

2,336,622

886,522

698,656

766,592

1997

754,875

764,541

1,246,192

3,123,211

2,577,177

2,832,195

2,547,957

2,802,564

2,865,074

1,153,437

829,396

790,143

1998

1,157,481

956,330

1,082,925

1,423,426

1,383,849

1,589,212

1,484,282

3,267,832

2,779,137

910,426

653,162

821,514

1999

1,013,840

919,404

962,314

1,533,970

1,596,448

2,290,657

1,917,867

2,133,359

2,660,513

923,768

732,325

750,756

2000

760,134

695,305

1,015,905

995,083

1,239,833

1,264,985

1,688,071

1,198,721

812,522

574,565

489,337

608,991

2001

667,132

819,352

802,659

763,900

698,338

895,114

662,637

665,472

494,012

447,678

404,432

483,352

2002

587,558

648,098

708,096

684,360

621,762

830,182

1,094,267

919,901

834,684

616,034

559,525

593,936

2003

609,154

635,499

698,736

778,634

706,594

777,907

801,261

1,108,033

853,661

499,839

445,754

516,805

2004

614,047

642,884

679,695

638,246

716,464

1,029,135

912,618

901,124

771,495

577,305

514,172

528,308

2005

603,815

610,949

657,912

593,593

546,070

683,513

684,488

1,260,811

662,081

577,275

494,707

498,384

2006

587,326

696,031

848,273

1,259,909

916,535

1,613,422

3,240,117

3,201,551

1,245,750

540,159

429,399

553,725

2007

674,632

702,702

748,084

669,952

755,718

1,166,607

899,966

694,514

437,006

619,800

410,527

397,311

2008

632,443

686,558

686,445

638,268

656,656

1,006,309

1,016,267

1,495,762

1,521,431

615,950

496,930

552,007

6.0 Model Output

26

Table 6-2. Modified flow into Brownlee Reservoir, water years 1928 – 2008 in monthly average (cfs).

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928

15,577

24,166

14,904

19,573

16,597

24,639

22,337

43,956

22,965

11,059

9,081

9,171

1929

9,511

11,862

10,820

13,914

11,822

16,698

13,639

19,519

15,389

8,974

8,899

7,820

1930

8,357

10,200

10,894

10,905

16,608

13,680

12,364

12,216

11,251

8,276

7,668

7,587

1931

8,886

10,083

9,974

9,900

9,175

11,517

8,366

6,890

4,828

4,598

5,324

5,818

1932

9,360

10,675

10,503

10,114

12,181

25,204

21,289

26,956

23,702

10,150

7,670

8,217

1933

9,055

11,443

10,204

9,784

9,742

15,208

13,858

13,727

27,054

10,398

7,857

8,085

1934

8,995

11,518

11,723

12,967

11,705

11,901

11,482

6,076

4,896

4,650

4,947

5,977

1935

7,928

10,451

10,211

9,902

9,848

12,255

14,046

13,562

13,418

11,383

7,866

7,803

1936

8,446

10,402

9,686

10,692

12,160

14,135

26,512

27,086

20,427

13,780

7,266

8,359

1937

9,111

11,066

10,537

9,631

9,742

11,700

11,768

11,421

9,803

5,881

5,925

7,283

1938

9,253

12,048

15,010

12,839

15,829

31,733

38,388

34,390

29,872

13,062

8,708

9,688

1939

11,391

12,639

11,549

13,103

13,074

23,642

22,985

15,708

7,964

6,239

6,696

8,054

1940

9,118

12,585

12,614

12,582

17,350

23,914

24,200

17,714

10,579

6,450

6,975

9,350

1941

10,404

12,952

12,438

12,388

15,666

17,946

13,052

14,933

17,006

7,885

8,670

9,221

1942

10,736

13,891

15,444

13,531

16,331

17,276

30,214

19,471

20,363

15,760

8,826

9,736

1943

10,138

14,149

15,289

28,794

28,615

38,635

63,263

29,337

31,641

19,210

10,857

11,812

1944

13,386

14,636

14,767

12,807

13,541

14,231

12,869

11,546

14,781

9,654

9,319

9,039

1945

10,285

12,838

11,301

14,123

18,660

17,819

13,105

24,074

26,534

12,490

8,948

10,580

1946

11,217

16,472

16,973

19,856

18,622

34,922

45,381

29,830

18,841

14,681

9,608

10,392

1947

12,064

16,286

19,127

15,208

19,793

23,334

19,832

27,326

22,415

12,315

9,342

9,876

1948

11,300

12,606

14,201

18,363

15,774

15,432

18,315

26,999

32,715

12,361

9,277

9,600

1949

10,832

11,789

11,117

12,257

16,926

24,291

22,771

34,557

20,799

10,160

8,843

8,864

1950

10,779

12,285

12,016

16,663

19,661

25,565

30,765

21,693

34,739

15,289

10,367

11,272

1951

13,501

17,902

19,174

20,679

30,504

24,531

36,222

30,189

25,168

11,878

10,174

10,718

1952

18,294

18,692

18,249

25,714

25,769

26,128

64,954

52,495

34,535

13,902

9,610

10,272

1953

11,406

11,996

12,212

23,461

19,567

18,676

19,730

21,713

45,075

14,399

9,677

9,780

1954

11,423

13,582

12,224

16,100

18,410

21,214

23,020

25,833

20,052

11,810

10,232

9,483

1955

10,666

12,858

11,666

13,486

13,118

11,650

13,216

16,728

19,466

10,992

8,670

8,542

6.0 Model Output

27

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1956 10,072 12,650 21,327 28,584 25,501 30,785 38,898 29,972 37,034 12,091 10,260 10,914

1957

13,008

14,494

13,482

18,444

27,459

31,608

27,849

41,947

39,293

11,923

9,960

11,154

1958

12,475

12,308

15,317

18,604

25,974

21,822

27,198

44,327

24,635

9,494

9,067

9,849

1959

12,923

16,196

15,468

17,234

14,779

15,803

14,537

15,645

21,384

11,433

10,256

12,330

1960

12,840

12,418

11,838

11,193

14,286

19,349

20,626

15,515

14,726

7,420

8,332

8,598

1961

10,632

13,445

11,528

9,797

13,912

12,805

10,597

10,784

11,987

6,072

5,652

7,755

1962

9,669

11,527

11,161

11,700

17,824

16,986

27,421

22,138

23,028

10,439

9,249

9,690

1963

12,854

13,585

14,328

12,081

22,147

15,512

16,134

21,155

31,025

11,471

8,678

10,169

1964

10,740

12,974

11,952

11,161

10,977

16,685

22,868

21,475

39,415

12,324

9,214

10,995

1965

11,730

13,241

26,855

37,859

40,113

32,500

33,565

32,962

39,971

14,963

13,117

12,973

1966

13,854

13,885

14,443

16,585

15,697

15,384

16,201

11,783

10,910

7,480

6,966

8,415

1967

10,363

12,517

14,302

16,052

15,966

17,439

12,799

17,064

36,754

12,915

9,308

9,731

1968

12,204

13,357

12,873

16,955

18,109

18,195

12,326

11,452

24,359

9,095

9,140

9,351

1969

11,886

13,680

12,499

25,449

21,514

21,545

41,226

40,776

23,419

10,860

9,737

10,041

1970

11,963

12,274

13,777

27,515

21,100

21,256

13,526

30,158

43,522

14,958

10,485

13,083

1971

13,031

18,692

17,580

41,061

38,933

38,723

44,101

44,758

45,411

18,684

11,294

12,273

1972

21,838

19,648

20,122

33,446

31,165

54,081

34,212

29,967

45,848

13,068

10,822

13,146

1973

20,016

18,946

18,480

18,844

17,123

17,443

15,940

21,951

19,342

9,895

9,076

10,548

1974

11,979

20,726

19,132

31,776

27,679

37,961

45,234

31,740

44,741

16,682

11,588

11,661

1975

14,345

15,756

17,332

20,865

23,475

25,004

30,119

30,563

49,128

19,145

12,764

12,340

1976

23,573

17,696

21,339

23,318

23,202

24,778

38,278

38,043

29,309

12,210

12,647

17,067

1977

17,710

15,256

13,720

14,625

13,966

12,001

6,061

6,892

6,472

5,093

5,905

7,206

1978

9,770

11,150

14,004

15,102

18,232

25,914

31,940

26,163

23,596

13,299

10,248

12,441

1979

12,360

14,128

11,686

17,427

19,899

18,705

14,539

20,188

11,349

8,481

8,565

9,416

1980

9,937

11,166

10,694

15,334

18,360

19,541

22,542

35,381

30,207

10,890

8,472

11,607

1981

10,615

11,984

14,283

15,073

19,898

17,601

16,204

15,591

17,674

9,492

8,487

9,163

1982

10,552

12,168

15,490

21,984

40,289

38,161

38,632

38,597

34,376

20,259

11,596

13,345

1983

18,797

17,299

22,209

32,331

36,450

55,141

32,714

50,098

47,971

19,715

12,649

12,286

1984

21,813

22,677

24,829

31,220

31,446

51,914

53,778

55,349

56,184

17,806

15,124

16,984

1985

19,674

21,295

17,182

19,786

20,271

22,152

37,638

27,092

13,025

7,775

7,570

15,483

6.0 Model Output

28

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1986

17,389

20,221

16,933

29,541

52,815

57,045

48,186

32,655

30,203

12,706

10,381

13,965

1987

14,512

17,037

16,803

13,995

15,124

16,468

13,075

10,456

9,121

7,959

7,506

8,508

1988

9,916

11,893

12,368

13,222

13,527

13,305

14,151

9,908

9,183

6,219

6,114

7,694

1989

8,849

11,678

11,385

10,365

12,301

24,172

29,508

21,006

14,722

9,774

8,209

9,906

1990

11,589

11,774

11,164

10,830

10,183

14,178

13,424

11,185

12,694

9,528

8,334

8,340

1991

10,231

11,156

10,704

10,554

11,024

10,314

10,217

11,988

12,269

9,239

8,296

8,312

1992

9,862

11,304

11,083

10,025

12,232

10,514

8,542

6,882

4,996

4,557

4,510

5,764

1993

8,229

10,086

9,782

10,290

10,827

26,910

24,565

27,582

26,598

12,131

10,441

10,871

1994

11,450

11,150

11,066

11,399

11,949

13,800

12,777

12,893

8,844

7,309

6,567

7,367

1995

9,503

10,261

11,380

13,632

15,914

20,622

25,358

31,665

35,313

14,398

10,823

11,075

1996

11,702

12,129

17,596

29,802

37,709

37,765

37,364

34,282

39,268

14,418

11,363

12,883

1997

12,277

12,849

20,267

50,794

46,405

46,061

42,820

45,579

48,149

18,759

13,489

13,279

1998

18,825

16,072

17,612

23,150

24,918

25,846

24,944

53,146

46,705

14,807

10,623

13,806

1999

16,489

15,451

15,651

24,948

28,746

37,254

32,231

34,696

44,711

15,024

11,910

12,617

2000

12,362

11,685

16,522

16,183

21,555

20,573

28,369

19,495

13,655

9,344

7,958

10,234

2001

10,850

13,770

13,054

12,424

12,574

14,558

11,136

10,823

8,302

7,281

6,577

8,123

2002

9,556

10,892

11,516

11,130

11,195

13,502

18,390

14,961

14,027

10,019

9,100

9,981

2003

9,907

10,680

11,364

12,663

12,723

12,651

13,466

18,020

14,346

8,129

7,249

8,685

2004

9,987

10,804

11,054

10,380

12,456

16,737

15,337

14,655

12,965

9,389

8,362

8,879

2005

9,820

10,267

10,700

9,654

9,833

11,116

11,503

20,505

11,127

9,388

8,046

8,376

2006

9,552

11,697

13,796

20,490

16,503

26,240

54,452

52,068

20,936

8,785

6,984

9,306

2007

10,972

11,809

12,166

10,896

13,607

18,973

15,124

11,295

7,344

10,080

6,677

6,677

2008

10,286

11,538

11,164

10,380

11,416

16,366

17,079

24,326

25,569

10,017

8,082

9,277

6.0 Model Output

29

6.2 Naturalized Flow

MODSIM model output representing naturalized flow conditions into Brownlee Reservoir are presented in the following tables. Table 6-3. Naturalized flow into Brownlee Reservoir, water years 1928 – 2008 in (acre-feet per month).

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928

1,033,150

1,227,430

1,104,885

1,101,703

842,457

1,902,149

1,877,621

4,968,673

2,906,940

1,554,789

861,241

763,998

1929

956,051

882,688

646,157

716,659

505,903

1,271,005

1,549,690

3,059,230

2,519,371

1,206,231

699,759

694,869

1930

783,613

686,799

820,072

573,343

932,480

968,933

1,417,873

2,171,784

2,016,110

967,965

842,270

723,203

1931

960,412

683,109

675,129

648,661

576,211

944,649

1,189,409

1,565,383

1,126,265

543,031

495,384

493,868

1932

1,481,578

584,218

644,607

620,214

685,559

1,735,598

2,159,277

3,692,576

3,209,038

1,314,647

722,840

640,949

1933

715,431

757,341

661,067

676,606

660,695

1,061,484

1,523,369

2,569,278

3,603,656

1,036,744

669,210

588,892

1934

657,517

673,504

796,066

914,557

727,555

1,008,758

1,348,048

1,405,979

1,173,685

536,414

397,842

413,436

1935

898,250

627,733

648,180

666,798

706,034

906,589

1,651,329

2,398,335

2,365,884

963,696

588,051

512,813

1936

642,985

683,296

625,331

728,033

870,957

1,192,379

2,819,453

4,092,702

3,118,905

1,105,844

785,112

674,722

1937

701,838

688,753

692,384

598,455

714,341

1,049,314

1,599,608

2,896,741

2,125,688

910,019

605,068

575,531

1938

710,077

738,549

1,114,367

849,238

961,457

1,795,757

2,762,153

4,341,782

3,753,903

1,918,319

877,737

726,517

1939

1,014,056

888,586

851,266

749,174

644,252

1,662,039

2,121,889

2,662,702

1,975,554

1,059,769

690,873

709,896

1940

816,151

651,443

732,486

787,868

1,056,960

1,794,870

2,314,812

2,792,222

1,803,611

802,411

571,848

787,232

1941

953,273

848,979

849,609

854,178

1,052,137

1,422,461

1,574,403

2,707,716

2,388,036

1,024,511

877,326

809,586

1942

919,312

918,245

1,142,827

850,390

883,564

1,139,750

2,682,299

2,918,313

3,014,657

1,319,933

751,311

764,026

1943

836,628

983,018

1,158,927

1,582,273

1,277,099

2,003,842

4,594,839

3,984,388

4,228,981

2,792,610

1,134,735

901,268

1944

1,037,689

1,000,040

897,433

796,370

776,680

936,787

1,630,340

2,227,306

2,918,462

1,455,055

768,375

746,434

1945

839,730

863,420

768,289

847,189

1,105,688

1,167,036

1,604,884

3,327,329

3,355,025

1,751,905

1,008,206

945,600

1946

988,801

947,841

1,078,570

1,022,028

830,656

2,028,064

3,322,030

4,015,409

2,976,374

1,400,740

915,036

918,110

1947

1,145,072

1,083,993

1,263,868

823,057

1,033,932

1,301,254

1,766,893

3,547,194

2,992,261

1,476,135

954,527

877,522

1948

1,028,504

903,715

946,725

977,372

866,270

974,491

1,763,711

3,510,437

3,567,850

1,341,785

877,056

839,256

1949

983,461

835,278

787,157

685,498

813,169

1,599,700

2,432,535

3,981,715

2,891,166

1,175,628

824,551

741,211

1950

1,020,345

886,494

813,260

839,603

942,501

1,524,349

2,363,126

3,499,397

4,043,592

2,368,293

1,106,916

960,832

1951

1,139,461

1,054,013

1,098,728

937,757

1,532,047

1,422,656

2,919,712

4,032,133

3,551,438

1,952,983

1,318,535

951,123

1952

1,242,144

1,023,635

1,178,777

962,228

907,984

1,500,600

4,899,309

5,933,127

3,757,554

1,752,115

995,151

908,554

1953

927,939

774,044

858,493

1,348,650

995,767

1,110,385

1,899,782

3,094,722

4,481,383

1,786,109

906,975

770,740

1954

882,510

856,425

881,519

944,507

957,551

1,203,024

1,940,264

3,370,979

2,942,397

1,737,138

919,375

786,406

1955

912,015

810,483

770,176

765,830

618,646

828,339

1,425,272

2,755,380

2,838,199

1,403,245

813,079

718,648

1956

860,514

877,985

1,648,758

1,511,021

924,066

1,603,954

2,887,627

4,598,254

4,320,454

1,676,449

1,001,144

860,541

1957

1,086,503

961,257

1,038,645

797,005

1,348,278

1,899,915

2,295,583

5,006,060

4,169,219

1,669,690

966,056

907,598

1958

1,035,376

846,431

955,321

861,915

1,496,424

1,260,779

2,444,940

4,937,247

3,397,072

1,202,604

834,429

819,797

6.0 Model Output

30

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1959

873,225

858,240

954,189

962,844

818,735

927,111

1,532,856

2,614,589

2,807,334

1,150,836

820,934

1,035,305

1960

1,167,817

833,165

824,212

778,714

912,065

1,642,163

1,995,854

2,475,913

2,571,563

888,197

757,128

720,806

1961

877,177

831,711

712,668

625,339

882,167

1,040,460

1,216,929

2,178,181

2,011,379

631,305

542,693

789,470

1962

957,281

777,806

749,104

689,612

1,232,163

1,122,500

2,487,697

3,467,139

3,161,964

1,417,691

918,063

794,339

1963

1,129,629

903,048

954,751

738,974

1,511,082

909,620

1,583,377

3,001,169

3,617,015

1,377,488

848,193

945,003

1964

755,130

885,000

801,088

781,402

688,406

985,812

2,084,518

3,275,618

4,288,474

1,804,911

962,959

924,353

1965

859,324

896,323

2,095,173

1,625,184

1,489,546

1,399,953

3,110,454

4,503,674

4,839,102

2,516,612

1,460,828

1,156,548

1966

1,023,360

862,887

871,955

957,257

733,074

1,123,580

1,664,671

2,562,181

2,233,544

1,037,843

720,710

806,229

1967

872,649

784,081

822,059

957,680

774,692

967,334

1,281,712

3,114,233

4,090,676

1,942,121

902,839

846,637

1968

1,022,432

890,600

797,918

788,156

1,136,012

1,122,031

1,111,547

2,289,889

3,175,018

1,367,598

1,370,671

983,135

1969

975,080

937,316

844,541

1,449,270

960,724

1,405,885

3,694,817

4,409,482

3,159,355

1,435,164

945,121

923,645

1970

1,077,609

810,007

853,313

1,765,037

1,117,555

1,149,925

1,357,422

3,888,004

4,378,827

2,112,140

1,010,230

1,171,403

1971

1,058,328

1,116,097

1,188,961

1,972,576

1,368,356

1,771,545

3,146,998

5,759,485

5,619,597

2,800,895

1,307,715

1,202,227

1972

1,250,685

1,108,705

1,133,607

1,423,475

1,310,419

3,228,906

2,436,780

4,711,922

5,327,323

2,214,699

1,317,026

1,233,056

1973

1,309,223

1,025,355

1,035,766

1,133,557

846,458

1,277,973

1,725,754

3,119,374

2,756,106

1,370,445

965,848

1,113,554

1974

1,120,071

1,216,927

1,184,280

1,533,764

928,745

2,147,155

3,109,161

4,474,703

5,222,214

2,406,820

1,255,978

1,030,631

1975

1,142,553

947,739

912,105

930,798

944,941

1,580,204

1,954,562

4,193,779

5,477,816

3,088,265

1,455,075

1,120,978

1976

1,356,829

980,484

1,193,126

1,029,606

1,014,850

1,357,570

2,682,367

4,660,931

3,821,364

2,113,608

1,547,315

1,294,507

1977

1,158,519

806,865

833,471

799,438

700,946

770,951

899,891

1,583,235

1,530,484

748,630

651,347

686,758

1978

815,345

685,608

1,110,029

1,072,994

1,044,247

1,757,057

2,640,612

3,638,632

3,529,892

2,137,304

1,120,674

1,138,657

1979

933,704

739,291

752,762

840,950

1,013,376

1,347,641

1,664,664

3,160,181

2,481,974

1,110,353

902,252

768,391

1980

904,507

653,511

744,589

1,110,546

1,176,455

1,150,215

2,109,767

4,035,466

3,519,987

1,578,021

903,451

1,067,904

1981

895,286

818,506

1,053,875

932,895

1,095,778

1,111,203

1,757,581

2,718,628

2,776,397

1,018,888

660,227

703,258

1982

914,014

835,306

1,229,192

921,113

2,212,230

1,882,564

2,852,519

5,267,725

4,771,124

2,957,003

1,262,368

1,192,967

1983

1,244,072

1,033,820

1,262,231

1,445,032

1,543,451

3,098,254

2,914,494

5,310,907

5,350,749

2,955,198

1,502,842

1,180,233

1984

1,317,534

1,351,702

1,455,063

1,391,172

1,453,360

2,761,203

3,696,367

5,979,977

5,753,713

2,791,029

1,585,181

1,272,460

1985

1,324,299

1,267,435

1,103,209

1,017,062

936,720

1,345,375

2,934,693

3,522,479

2,544,598

1,291,307

954,135

1,254,266

1986

1,179,049

937,686

1,015,090

1,095,538

2,609,351

3,233,693

3,484,195

4,283,090

4,572,662

1,929,591

1,186,842

1,282,769

1987

1,267,257

1,011,884

894,472

908,030

903,654

1,258,107

1,598,698

2,353,965

1,968,733

1,102,369

802,171

775,939

1988

768,465

798,405

768,547

769,961

759,213

988,044

1,635,145

2,233,633

1,661,424

684,007

546,717

631,859

1989

687,581

734,666

761,788

740,211

776,905

2,447,659

2,806,340

3,179,184

2,536,284

1,149,041

882,633

850,040

1990

1,021,653

773,028

756,159

790,809

657,602

1,099,284

1,787,133

2,190,812

2,220,751

970,431

693,259

611,028

1991

826,201

666,501

627,023

729,516

694,691

878,038

1,290,511

2,444,185

2,439,094

1,036,961

700,950

770,231

1992

804,139

734,668

737,458

676,371

829,824

880,039

1,177,493

1,642,948

1,144,453

672,664

488,069

529,569

1993

599,574

559,095

636,935

694,946

646,809

2,676,443

2,608,542

4,452,962

3,431,734

1,668,834

1,245,709

923,396

1994

1,017,452

668,976

775,691

787,073

663,777

966,434

1,482,519

2,589,834

1,535,389

745,743

655,918

535,186

1995

779,227

576,847

775,280

1,038,432

1,283,269

1,765,693

2,168,499

4,072,764

4,102,896

2,325,413

1,101,469

927,153

6.0 Model Output

31

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1996

1,034,719

847,896

1,221,842

1,044,424

1,595,482

1,880,918

3,094,324

4,747,628

4,753,034

2,197,050

1,096,650

1,046,273

1997

1,019,867

1,022,730

1,478,418

2,559,394

1,487,104

2,173,730

3,448,425

6,168,273

5,525,982

2,612,578

1,480,760

1,235,525

1998

1,264,778

932,359

946,740

1,166,005

1,013,501

1,665,305

2,407,013

5,392,724

4,611,168

2,390,281

1,221,858

1,168,367

1999

1,143,901

900,743

1,005,142

1,096,777

1,047,605

2,031,577

2,724,193

4,438,156

4,923,901

2,152,022

1,261,794

1,080,519

2000

1,055,794

838,778

899,962

985,616

1,256,144

1,413,415

2,525,722

3,212,930

2,519,559

1,202,774

806,470

877,240

2001

946,081

698,167

726,865

756,465

686,789

1,132,809

1,392,268

2,113,348

1,249,179

702,371

573,669

571,062

2002

690,412

639,317

773,123

812,543

695,293

1,186,870

2,243,169

2,528,492

2,124,578

900,568

638,515

705,341

2003

759,065

641,368

770,330

949,657

847,340

1,099,271

1,752,572

2,888,278

2,493,391

834,569

634,698

708,783

2004

791,895

626,622

763,446

733,358

873,805

1,624,356

1,794,408

2,424,616

2,070,259

1,014,043

710,411

721,568

2005

839,861

646,930

786,301

735,898

620,419

992,352

1,555,768

3,712,938

2,304,111

1,083,504

693,732

686,099

2006

637,145

762,317

1,097,093

1,555,673

926,233

1,830,800

4,412,562

5,601,330

3,204,841

1,237,724

819,285

886,885

2007

972,065

810,614

892,616

797,771

895,999

1,317,702

1,770,552

2,545,524

1,490,226

686,690

562,406

640,967

2008

898,019

772,149

815,264

771,921

741,979

1,152,880

1,706,066

3,766,826

3,194,441

1,525,739

795,765

786,393

6.0 Model Output

32

Table 6-4: Naturalized flow into Brownlee Reservoir, water years 1928-2008 in monthly average (cfs).

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928

16,803

20,628

17,969

17,917

14,646

30,936

31,554

80,808

48,853

25,286

14,007 12,839

1929

15,549

14,834

10,509

11,655 9,109

20,671

26,043

49,754

42,339

19,617

11,380 11,678

1930

12,744

11,542

13,337 9,325

16,790

15,758

23,828

35,321

33,882

15,742

13,698 12,154

1931

15,620

11,480

10,980

10,549

10,375

15,363

19,989

25,459

18,928 8,832 8,057 8,300

1932

24,096 9,818

10,484

10,087

11,918

28,227

36,288

60,054

53,930

21,381

11,756 10,772

1933

11,635

12,728

10,751

11,004

11,896

17,263

25,601

41,785

60,561

16,861

10,884 9,897

1934

10,693

11,319

12,947

14,874

13,100

16,406

22,655

22,866

19,724 8,724 6,470 6,948

1935

14,609

10,549

10,542

10,844

12,713

14,744

27,752

39,005

39,760

15,673 9,564 8,618

1936

10,457

11,483

10,170

11,840

15,142

19,392

47,382

66,561

52,415

17,985

12,769 11,339

1937

11,414

11,575

11,261 9,733

12,862

17,065

26,882

47,111

35,723

14,800 9,840 9,672

1938

11,548

12,412

18,123

13,812

17,312

29,205

46,420

70,612

63,086

31,198

14,275 12,210

1939

16,492

14,933

13,845

12,184

11,600

27,030

35,660

43,305

33,200

17,235

11,236 11,930

1940

13,273

10,948

11,913

12,813

18,375

29,191

38,902

45,411

30,311

13,050 9,300 13,230

1941

15,504

14,268

13,818

13,892

18,945

23,134

26,459

44,037

40,132

16,662

14,268 13,606

1942

14,951

15,432

18,586

13,830

15,909

18,536

45,078

47,462

50,663

21,467

12,219 12,840

1943

13,606

16,520

18,848

25,733

22,995

32,589

77,219

64,800

71,070

45,417

18,455 15,146

1944

16,876

16,806

14,595

12,952

13,503

15,235

27,399

36,224

49,046

23,664

12,496 12,544

1945

13,657

14,510

12,495

13,778

19,909

18,980

26,971

54,114

56,383

28,492

16,397 15,891

1946

16,081

15,929

17,541

16,622

14,957

32,983

55,829

65,304

50,020

22,781

14,882 15,429

1947

18,623

18,217

20,555

13,386

18,617

21,163

29,694

57,690

50,287

24,007

15,524 14,747

1948

16,727

15,187

15,397

15,895

15,060

15,849

29,640

57,092

59,960

21,822

14,264 14,104

1949

15,994

14,037

12,802

11,149

14,642

26,017

40,880

64,756

48,588

19,120

13,410 12,456

1950

16,594

14,898

13,226

13,655

16,971

24,791

39,714

56,912

67,955

38,517

18,002 16,147

1951

18,532

17,713

17,869

15,251

27,586

23,137

49,067

65,576

59,684

31,762

21,444 15,984

1952

20,202

17,203

19,171

15,649

15,785

24,405

82,336

96,493

63,148

28,495

16,185 15,269

1953

15,091

13,008

13,962

21,934

17,930

18,059

31,927

50,331

75,312

29,048

14,751 12,953

1954

14,353

14,393

14,337

15,361

17,242

19,565

32,607

54,824

49,449

28,252

14,952 13,216

1955

14,833

13,621

12,526

12,455

11,139

13,472

23,953

44,812

47,698

22,822

13,223 12,077

6.0 Model Output

33

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1956 13,995 14,755 26,814 24,574 16,065 26,086 48,528 74,783 72,608 27,265 16,282 14,462

1957

17,670

16,154

16,892

12,962

24,277

30,899

38,579

81,416

70,066

27,155

15,711 15,253

1958

16,839

14,225

15,537

14,018

26,945

20,505

41,089

80,297

57,090

19,558

13,571 13,777

1959

14,202

14,423

15,518

15,659

14,742

15,078

25,761

42,522

47,179

18,717

13,351 17,399

1960

18,993

14,002

13,405

12,665

15,856

26,707

33,541

40,267

43,217

14,445

12,314 12,114

1961

14,266

13,977

11,590

10,170

15,884

16,921

20,451

35,425

33,802

10,267 8,826 13,267

1962

15,569

13,071

12,183

11,215

22,186

18,256

41,807

56,388

53,139

23,057

14,931 13,349

1963

18,372

15,176

15,528

12,018

27,208

14,794

26,610

48,809

60,786

22,403

13,795 15,881

1964

12,281

14,873

13,028

12,708

11,968

16,033

35,032

53,273

72,070

29,354

15,661 15,534

1965

13,976

15,063

34,075

26,431

26,821

22,768

52,273

73,245

81,324

40,929

23,758 19,436

1966

16,643

14,501

14,181

15,568

13,200

18,273

27,976

41,670

37,536

16,879

11,721 13,549

1967

14,192

13,177

13,370

15,575

13,949

15,732

21,540

50,648

68,746

31,586

14,683 14,228

1968

16,628

14,967

12,977

12,818

19,750

18,248

18,680

37,241

53,358

22,242

22,292 16,522

1969

15,858

15,752

13,735

23,570

17,299

22,865

62,093

71,713

53,095

23,341

15,371 15,522

1970

17,526

13,613

13,878

28,706

20,123

18,702

22,812

63,232

73,589

34,351

16,430 19,686

1971

17,212

18,757

19,337

32,081

24,639

28,811

52,887

93,669

94,440

45,552

21,268 20,204

1972

20,340

18,632

18,436

23,151

22,782

52,513

40,951

76,632

89,529

36,019

21,419 20,722

1973

21,292

17,232

16,845

18,436

15,241

20,784

29,002

50,732

46,318

22,288

15,708 18,714

1974

18,216

20,451

19,260

24,944

16,723

34,920

52,251

72,774

87,762

39,143

20,427 17,320

1975

18,582

15,927

14,834

15,138

17,015

25,700

32,848

68,205

92,058

50,226

23,665 18,839

1976

22,067

16,478

19,404

16,745

17,643

22,079

45,079

75,803

64,220

34,375

25,165 21,755

1977

18,842

13,560

13,555

13,002

12,621

12,538

15,123

25,749

25,721

12,175

10,593 11,541

1978

13,260

11,522

18,053

17,451

18,803

28,576

44,377

59,177

59,322

34,760

18,226 19,136

1979

15,185

12,424

12,243

13,677

18,247

21,917

27,976

51,395

41,711

18,058

14,674 12,913

1980

14,710

10,983

12,110

18,061

20,453

18,706

35,456

65,631

59,155

25,664

14,693 17,947

1981

14,560

13,755

17,140

15,172

19,731

18,072

29,537

44,214

46,659

16,571

10,738 11,819

1982

14,865

14,038

19,991

14,980

39,833

30,617

47,938

85,671

80,181

48,091

20,530 20,048

1983

20,233

17,374

20,528

23,501

27,791

50,388

48,980

86,374

89,922

48,062

24,441 19,834

1984

21,428

22,716

23,664

22,625

25,267

44,907

62,120

97,255

96,694

45,392

25,781 21,384

1985

21,538

21,300

17,942

16,541

16,867

21,880

49,319

57,288

42,763

21,001

15,518 21,079

6.0 Model Output

34

Water Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1986

19,175

15,758

16,509

17,817

46,984

52,591

58,554

69,658

76,846

31,382

19,302 21,558

1987

20,610

17,005

14,547

14,768

16,271

20,461

26,867

38,284

33,086

17,928

13,046 13,040

1988

12,498

13,418

12,499

12,522

13,199

16,069

27,480

36,327

27,921

11,124 8,891 10,619

1989

11,182

12,346

12,389

12,038

13,989

39,807

47,162

51,705

42,624

18,687

14,355 14,285

1990

16,616

12,991

12,298

12,861

11,841

17,878

30,034

35,630

37,321

15,783

11,275 10,269

1991

13,437

11,201

10,198

11,864

12,509

14,280

21,688

39,751

40,990

16,865

11,400 12,944

1992

13,078

12,347

11,994

11,000

14,427

14,312

19,788

26,720

19,233

10,940 7,938 8,900

1993 9,751 9,396

10,359

11,302

11,646

43,528

43,838

72,421

57,672

27,141

20,260 15,518

1994

16,547

11,243

12,615

12,801

11,952

15,718

24,915

42,120

25,803

12,128

10,667 8,994

1995

12,673 9,694

12,609

16,888

23,106

28,716

36,443

66,237

68,951

37,819

17,914 15,581

1996

16,828

14,249

19,871

16,986

27,738

30,590

52,002

77,213

79,877

35,732

17,835 17,583

1997

16,587

17,188

24,044

41,625

26,777

35,352

57,953

100,31

7

92,867

42,490

24,082 20,764

1998

20,570

15,669

15,397

18,963

18,249

27,084

40,451

87,704

77,493

38,874

19,872 19,635

1999

18,604

15,137

16,347

17,837

18,863

33,040

45,782

72,180

82,749

34,999

20,521 18,159

2000

17,171

14,096

14,636

16,030

21,838

22,987

42,446

52,253

42,343

19,561

13,116 14,743

2001

15,387

11,733

11,821

12,303

12,366

18,423

23,398

34,370

20,993

11,423 9,330 9,597

2002

11,228

10,744

12,574

13,215

12,519

19,303

37,698

41,122

35,705

14,646

10,384 11,854

2003

12,345

10,779

12,528

15,445

15,257

17,878

29,453

46,973

41,903

13,573

10,322 11,911

2004

12,879

10,531

12,416

11,927

15,191

26,418

30,156

39,433

34,792

16,492

11,554 12,126

2005

13,659

10,872

12,788

11,968

11,171

16,139

26,146

60,385

38,722

17,622

11,282 11,530

2006

10,362

12,811

17,843

25,301

16,678

29,775

74,156

91,097

53,859

20,130

13,324 14,905

2007

15,809

13,623

14,517

12,975

16,133

21,430

29,755

41,399

25,044

11,168 9,147 10,772

2008

14,605

12,976

13,259

12,554

12,899

18,750

28,671

61,262

53,684

24,814

12,942 13,216

6.0 Model Output

35

Comparison of the Modified Flow and Naturalized Flow are presented in Table 6-5. The difference between these scenarios represents the current depleted flow, on average, into Brownlee Reservoir due to upstream irrigation practices and land uses. The other columns present the depleted flow represented in other basins. Table 6-5. Comparison of average volumes between Modified Flow and Naturalized Flow modeled output for period of records shown

Location

Snake River at Brownlee

(MAF)

Snake River at King Hill

(MAF) Boise River

(MAF) Payette River

(MAF) Average: 1928-2008 Modified Flow 12.257 6.652 1.142 2.191Naturalized Flow 18.413 9.218 2.371 2.679Difference (6.156) (2.565) (1.228) (0.488) Average: 1990-2008 Modified Flow 11.330 6.295 0.959 2.023Naturalized Flow 17.560 8.756 2.272 2.515Difference (6.231) (2.460) (1.313) (0.492)

7.0 Comparison of Modified Flows

36

7.0 Comparison of Modified Flows The modified flows that were calculated in the 2010 level of development update are slightly different than the 2000 modified flows data set. The 2010 modified flows incorporate the current level of irrigation development, which reflects the affects of groundwater pumping in the system. The 2010 modified flows data set is considered a more accurate estimation of 2010 conditions because all years reflect the same current level of groundwater impacts. The differences in annual volume and peaks for 1990-1999 (the last ten years of overlap in the two datasets) are presented in Table 7-1. Table 7-1: Comparison of the 2010 Modified Flows dataset to the 2000 Modified Flows dataset for years 1990-1999 (the last 10 years of overlap).

Water Year

Annual Volume Annual Maximum Annual Minimum 2010 2000 2010 2000 2010 2000

1990 8,039,261 8,394,000 871,759 835,000 496,282 459,0001991 7,494,307 7,814,000 737,104 829,000 494,610 485,0001992 6,056,116 6,775,000 703,595 739,000 277,300 340,0001993 11,371,433 12,320,000 1,695,935 1,847,000 506,008 554,0001994 7,631,721 8,466,000 848,508 887,000 403,761 492,0001995 12,651,643 13,247,000 2,101,271 2,214,000 584,343 653,0001996 17,866,325 18,787,000 2,336,622 2,896,000 698,656 756,0001997 22,286,762 23,993,000 3,123,211 3,177,000 754,875 829,0001998 17,509,576 18,546,000 3,267,832 3,371,000 653,162 753,0001999 17,435,221 18,331,000 2,660,513 2,660,000 732,325 784,000

Averages 12,834,237 13,667,300 1,834,635 1,945,500 560,132 610,500

% differences -6% -6% -8%

The annual volumes for the 2000 dataset are six percent larger than the 2010 dataset on average. The significant difference between these datasets was the assumption of groundwater pumping depletions above King Hill. Therefore, the results between the two data sets are not directly comparable. The previous modified flow analysis was modeled with an estimated 1.5 million acre feet (MAF) of groundwater pumping. The response attributable to the groundwater pumping on the Eastern Snake Plane Aquifer was only at year 2000 levels, representing less than the steady state condition of 1.5 MAF. The 2010 Modified Flow analysis incorporated 2.0 MAF of total groundwater pumping above King Hill for irrigation purposes, as reported by the Department of Idaho Water Resources (IDWR). As a result, the annual volumes presented for the 2010 Modified Flow analysis are lower. This equates to an additional amount of aquifer depletion as well as an additional 10 years of aquifer response to the additional groundwater pumping effects and surface water irrigation practices.

7.0 Comparison of Modified Flows

37

The total effect to the Snake River as a result of the additional pumping is still less than the 2.0 MAF representing steady state conditions. The methodologies used in the data infill process, definition of irrigation demand patterns, and calibration efforts were more consistent between basins for the 2010 Modified Flow model than for the 2000 model development. The variations in procedures between the data sets account for some of the differences presented in Table 7-1. However, the majority of the differences are a result of accounting for additional groundwater pumping. .

8.0 Literature Cited

39

8.0 Literature Cited Parenthetical Reference Bibliographic Citation

Contor 2004 Contor, B.A., D.M. Cosgrove, G.S. Johnson, N. Rinehart, and A. Wylie. 2004. Hydrologic Effects of Curtailment of Ground Water Pumping “Curtailment Scenario.” Idaho Water Resources Research Institute University of Idaho, for the Idaho Department of Water Resources. Idaho Water Resources Research Institute Technical Report 04-023.

Cosgrove 2006 Cosgrove, D.M., B.A. Contor, and G.S. Johnson. 2006. Enhanced Snake Plain Aquifer Model Final Report. Idaho Water Resources Research Institute University of Idaho, for the Idaho Department of Water Resources. Idaho Water Resources Research Institute Technical Report 06-002. 120 p.

Garabedian 1992 Garabedian, S.P. 1992. Hydrogeology and Digital Simulation of the Regional Aquifer System, Eastern Snake River Plain, Idaho. U.S. Geological Survey Professional Paper 1408-F.

Johnson 1999 Johnson, G.S. and D.M. Cosgrove., 1999, Application of Steady State Response Ratios to the Snake River Plain Aquifer: Idaho Water Resources Research Institute, University of Idaho, Moscow, ID, 31 p

NMFS 2005 National Marine Fisheries Service. 2005. Biological Opinion and Magnuson-Stevens Fishery Conservation and Management Act Consultation – Consultation for the Operations and Maintenance of 12 U.S. Bureau of Reclamation Projects in the Upper Snake River Basin above Brownlee Reservoir. F/NWR/2004/01900. NMFS, Northwest Region, Portland, Oregon. March 31, 2005

8.0 Literature Cited

40

Parenthetical Reference Bibliographic Citation

NMFS 2008 National Marine Fisheries Service. 2008. Remand of 2004 Biological Opinion on the Federal Columbia River Power System (FCRPS) including 19 Bureau of Reclamation Projects in the Columbia Basin (Revised pursuant to court order, NWF v. NMFS, Civ. No. CV 01-640-RE (D. Oregon) (FCRPS BiOp); Operations and Maintenance of the USBR Upper Snake River Basin Projects above Brownlee Reservoir (Upper Snake BiOp, F/NWR/2005/05883. NMFS, Northwest Region, Portland, Oregon. May 5, 2008

USBR 2004 U.S. Bureau of Reclamation. 2004. Biological Assessment for Bureau of Reclamation Projects in the Snake River Basin above Brownlee Reservoir. Snake River Area, Pacific Northwest Region, Boise, Idaho.

USBR 2006 U.S. Bureau of Reclamation, Idaho Department of Water Resources Planning Bureau. 2006. A distributed parameter water budget data base for the Boise Valley. Bureau of Reclamation Report of Investigation, 105 pp.

USBR 2007 U.S. Bureau of Reclamation. 2007. Biological Assessment for Bureau of Reclamation Operations and Maintenance in the Snake River Basin above Brownlee Reservoir. Snake River Area, Pacific Northwest Region, Boise, Idaho.

USFWS 2005 U.S. Fish and Wildlife Service. Biological Opinion for Bureau of Reclamation Operations and Maintenance in the Snake River Basin Above Brownlee Reservoir, 2005. Prepared for U.S. Bureau of Reclamation.

4.0 References

25

4.0 References Gannett, Marshall and Kenneth Lite (2004). Simulation of Regional Ground-

Water Flow in the Upper Deschutes Basin, Oregon. WR 03-4195. Portland, Oregon.

State of Oregon, Water Resources Department (OWRD) (2008). Deschutes

Ground Water Mitigation Program, Five-Year Program Evaluation Report. Oregon.

U.S. Bureau of Reclamation (USBR) (2003). Biological Assessment on

Continued Operation and Maintenance of the Deschutes River Basin Projects and Effects on Essential Fish Habitat under the Magnuson-Stevens Act: Deschutes, Crooked River and Wapinitia Projects. Lower Columbia Area Office, Portland, Oregon.

This page is intentionally left blank

D

E

S

C

H

U

T

E

S

This page is intentionally left blank

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Office Boise, Idaho December 2009

Naturalized and Modified Flows of the Deschutes River Basin

Mission Statements The mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to Indian Tribes and our commitments to island communities. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public.

U.S. Department of the Interior Bureau of Reclamation Pacific Northwest Regional Office Boise, Idaho December 2009

Naturalized and Modified Flows of the Deschutes River Basin prepared by River and Reservoir Operations Jennifer Johnson, P.E., Hydraulic Engineer

Contents

iii

Contents

Page Acknowledgments ................................................................................................. v 1.0 Introduction ............................................................................................... 1

1.1 Deschutes River Basin Operations........................................................ 2 1.1.1 Crane Prairie Operations ................................................................. 3 1.1.2 Wickiup Reservoir Operations ........................................................ 4 1.1.3 Prineville Reservoir Operations ...................................................... 6 1.1.4 Crooked River ESA requirements .................................................. 8

1.2 Objectives ............................................................................................. 9 2.0 Deschutes Naturalized flows .................................................................. 11 3.0 Deschutes Modified Flows ...................................................................... 17

3.1 Comparison of year 2000 Modified Flows and year 2010 Modified flows .................................................................................................... 22

4.0 References ................................................................................................ 25

Acknowledgments

v

Acknowledgments The MODSIM model of the Deschutes basin was a collaborative effort between Oregon Department of Water Resources, Natural Resources Consulting Engineers, Inc, and Reclamation. This effort would not have been possible without the work performed by these agencies.

1.0 Introduction

1

1.0 Introduction Modified Flows, as computed by Reclamation for the Deschutes River, are the historic stream flow sequences regulated to reflect what would have occurred with 2010 reservoir regulation and 2010 level demands. The Modified Flows produced by Reclamation are different from the Modified Flows produced by the Corps of Engineers (Corps) and Bonneville Power Administration (BPA) for other parts of the Columbia System. That is because the Columbia River system hydropower simulation models used by the Corps and BPA require unregulated modified stream flows as inputs at the areas of primary interest and incorporate regulated modified flows for the Deschutes, Yakima, and Snake River basins. The Corps and BPA do not attempt to simulate reservoir operations at Reclamation irrigation facilities on the tributaries to the Columbia River. Modified flows quantified in the Pacific Northwest by the Corps, BPA and Reclamation are used together as base line stream flows for analysis of future conditions, such as changes to the Federal Columbia power system due to operational or climatic changes. This report describes the distribution modeling that was used to develop the 2010 Modified Flows for the Deschutes River Basin above Lake Billy Chinook (aka Round Butte Reservoir) (Figure 1-1).

Figure 1-1: Map of Deschutes river, major tributaries, and reservoirs.

1.0 Introduction

2

1.1 Deschutes River Basin Operations

The Deschutes/Crooked River system includes the following reservoirs owned by Reclamation: Crane Prairie, Wickiup, and Haystack reservoirs on the Deschutes River and Prineville reservoir on the Crooked River. Crescent Lake and Lake Billy Chinook on the Deschutes River and Ochoco Reservoir on the Crooked River are not owned or operated by Reclamation. Figure 1-2 is a diagram of the Deschutes River basin water distribution system. A MODSIM reservoir simulation model was created to simulate natural, historic, and current conditions. In the creation of modified flows, the model attempts to operate the Reclamation operated reservoirs as it is described in the Biological Assessment of the Deschutes River basin; those operations are described below1

. The reservoirs that are not operated by Reclamation are simulated in the model to represent historical flows.

1 Operation descriptions are excerpts from the Operations Description of the Deschutes River Basin Projects report (USBR, 2003).

1.0 Introduction

3

Figure 1-2: Deschutes River Basin Water Distribution System (USBR, 2003).

1.1.1 Crane Prairie Operations Reclamation has title to Crane Prairie Dam and Reservoir; however, as a transferred work, daily Operations and Maintenance (O&M) is the responsibility of Central Oregon Irrigation District (COID) personnel. Irrigation releases typically begin by mid-to-late April. Non-irrigation releases may occur earlier if

1.0 Introduction

4

the reservoir is full and must pass inflow. The reservoir does not typically begin to draft appreciably until late May or early June. Irrigation releases typically peak in June and July between 200 cfs and 500 cfs, but can be higher or lower depending on the water supply. In dry years, lower flows are maintained in order to stretch the water supply over the entire season. An effort is made to set a summer flow that can be maintained without constant adjustments. Releases are typically reduced to minimum downstream flows in late October or early November. Although Crane Prairie Reservoir has no minimum flow requirements, the watermaster and the irrigation districts have a non-binding agreement to release a minimum of 30 cfs to protect instream resources. Winter flows below Crane Prairie Dam are often higher than this in all but the driest years. Table 1-1 summarizes operations at Crane Prairie Dam and Reservoir. Table 1-1: Summary of Crane Prairie Reservoir Operations (USBR, 2003). Item Comment Releases 30 cfs Informal (non-binding) minimum release by agreement of

watermaster and irrigation districts to benefit fish and wildlife.

200-500 cfs Typical irrigation releases Rate of rise (maximum) No standard ramping rate as it depends on the flows, trying

to make sudden changes. Rate of drop (minimum) No standard ramping rate as it depends on the flows, trying

not to make sudden changes. Reservoir Content Minimum pool None required; typically stays above 10,000 acre-feet.

Recorded minimum of 9,470 acre-feet in 1980.1 24,000 acre-feet Average end-of-September carryover (1961-2001 period of

record). 30,000 acre-feet Maximum storage level until Wickiup reaches 180,000 acre-

feet. 45,000 acre-feet Maximum storage level until Wickiup reaches 200,000 acre-

feet 55,300 acre-feet Full pool; achieved in about 1 out of every 3 years. Allocation of Reservoir Content COID 26,000 acre-feet Arnold ID 13,500 acre-feet Lone Pine ID 10,500 acre-feet 11961 – 2002 period of record. For the period of 1925 – 1960, the reservoir reached empty of near empty in 14 of the years, with the latest occurring in 1950.

1.1.2 Wickiup Reservoir Operations North Unit Irrigation District (NUID) operates Wickiup Dam. Day-to-day operations are directed by the Watermaster to meet storage requirements and irrigation demands. Reclamation does not hold the water right for storing or diverting Wickiup stored water. The irrigation season extends from April 1 to

1.0 Introduction

5

October 31, with the reservoir typically beginning to refill by mid-October. The filling schedule must adhere to the terms of an inter-district contract, which allows Wickiup Reservoir to fill at any time and at any rate provided that storage is below 180,000 acre-feet, while meeting minimum downstream releases. After storage has reached 180,000 acre-feet, outflow from Crane Prairie Reservoir is curtailed until that reservoir reaches 45,000 acre-feet. Wickiup Reservoir is then filled to 200,000 acre-feet (full pool) prior to further filling of Crane Prairie Reservoir beyond 45,000 acre-feet. Irrigation releases typically begin by mid-April and the reservoir commences drafting. In wet years this can be delayed until early May, and in extremely wet years the reservoir may not draft until early June. Irrigation releases typically peak in July between about 1,400 cfs and 1,600 cfs, but can be higher. Irrigation demand begins to diminish in September and releases are typically down to minimum flows by the middle of October. During the non-irrigation season, a minimum flow of 20 cfs is normally maintained at the gaging station about 1,000 feet downstream from Wickiup Dam. This minimum flow was established following a hearing held in September 1954 on the amended application to increase the storage in Wickiup Reservoir. The Oregon State Engineer identified a minimum release of 20 cfs for downstream conservation. Under normal storage conditions, this amount can be readily obtained from the downstream toe drain along the toe of the dam. Flows higher than 20 cfs can usually be supplied in a series of wet years without risk to refill (and thus to storage rights), as was the case from 1997 to 2000. Wickiup Dam and Reservoir operations are summarized in Table 2.

1.0 Introduction

6

Table 1-2: Summary of Wickiup Reservoir operations (USBR, 2003). Item Comment Releases 20 cfs +200 cfs

Minimum release by order of Oregon State Engineer in 1952 Typical minimum release in wetter years (roughly 40 percent of years)

1400-1600 cfs Typical peak irrigation release Rate of rise (maximum) Existing limits are 1 foot per hour, but watermaster voluntarily

operates to ½ foot per day. USFS proposed rates are 0.1 foot per 4-hours; adhered to when possible.

Rate of drop (minimum) Daily limits same as above. USFS proposed hourly limit is 0.2 foot per 12 hours; adhered to when possible.

Reservoir Content Minimum pool None required; typically stays above 25,000 acre-feet. Recent

recorded minimum was 15,600 acre-feet (1994).1 61,000 acre-feet Average end of September carryover. 180,000 acre-feet Maximum storage limit until Crane Prairie Reservoir fills to

45,000 acre-feet. 200,000 acre-feet Full pool; achieved or nearly achieved in approximately 70

percent of years. 1The reservoir reached 8,100 acre-feet and 8,800 acre-feet in 1955 and 1970, and reached 1,980 acre-feet in 1952.

1.1.3 Prineville Reservoir Operations Crooked River flows are comprised of winter snowfall and spring runoff in its upstream watershed and from spring flows as the river approaches its confluence with the Deschutes River. Upper Crooked River flows are highly variable, both seasonally and annually. This reach of the river is fed mostly by surface runoff, and soils are shallower and less porous than in the Deschutes River sub basin. Nearly all of the annual volume of reservoir inflow typically occurs during the December through June period (95 percent). Inflows from July through September account for less than 1 percent of the total, with inflows often less than 10 cfs. Prineville Reservoir behind Bowman Dam has a much better refill probability than nearby Ochoco Reservoir. Maximum fill occurs at Prineville Reservoir in approximately 3 out of 4 years, where Ochoco Reservoir only fills about 50 percent of the years. Therefore, priority is placed on using irrigation water from Prineville Reservoir to the maximum extent feasible, with Ochoco Reservoir releases made only to serve those lands with insufficient or no access to Prineville Reservoir water. Reclamation has contracted with Ochoco Irrigation District (OID) to perform O&M at Bowman Dam and Prineville Reservoir. Reservoir releases are made by OID between April 1 and October 31 as required to meet irrigation demand. OID

1.0 Introduction

7

coordinates water delivery requests within the district and calls orders into the dam tender who makes releases from Prineville Reservoir. Bowman Dam is operated under formal flood control rules and signed agreements. Flood control criteria at Bowman Dam involves flood control rule curves established by the Corps that prescribe the amount of reservoir space needed to control the predicted volume of runoff. A series of rule curves or tables determine the space requirement for a given water supply forecast on a particular date. Rule curves were developed using historic runoff, system storage potential, and downstream flow restrictions (i.e., downstream channel capacity). Flood control operation for Bowman Dam begins with no less than 60,000 acre-feet of evacuated space (equivalent to a maximum storage of 88,640 acre-feet of water) in Prineville Reservoir on November 15 through February 15. During this time, water may not be stored, except during floods after which it is evacuated. After February 15, the reservoir can be filled as determined by a special forecast runoff equation and related established rule curve through April 30. Final fill may occur between April 1 and April 30 depending on forecasted runoff volume. Once flood control space has been filled, flow can occur over the uncontrolled spillway crest, although the outlet works are primarily used to regulate releases. Releases from the outlet works are managed to minimize property damage. Authorizing legislation for the Crooked River Project mandates a minimum 10 cfs release through Prineville Reservoir. Currently, Reclamation maintains minimum releases ranging between 30-75 cfs below Bowman Dam. Storable inflows are bypassed if existing contractual obligations are not impacted. The lower flows in that range are released in drier years and extended drought conditions when refill of the reservoir is jeopardized. The uncontracted storage in Prineville Reservoir is used to achieve these releases. The legal mandated minimum release remains 10 cfs. Recreation on Prineville Reservoir is a consideration of current operations, although not specifically an authorized purpose. If sufficient storage exists and spaceholder contracts can be met, an attempt is made to keep enough water in Prineville Reservoir to maintain boat access at ramps at Prineville State Park through peak visitation periods (typically May - August). Table 3 summarizes operations at Bowman Dam and Prineville Reservoir.

1.0 Introduction

8

Table 1-3: Summary of Prineville Reservoir Operations (USBR, 2003). Item Comment Releases 10 cfs Minimum authorized release 30-35 cfs Informal minimum release during extreme drought 75 cfs Informal minimum release target provided by bypassing inflows

from Reclamation’s uncontracted storage space 200-240 cfs Typical peak irrigation releases 2,000 cfs Informal target, not to exceed for flood control; increased back

erosion above this level 3,000 cfs Maximum flood control flow, unless exceeded by spillway discharge Rate of change (maximum) None Reservoir Content Minimum pool None required; uncontracted space serves to maintain pool. Recent

recorded minimum pool was 22,450 acre-feet in 1993. Maximum winter flood control pool (November 15 – February 15)

88,640 acre-feet

83,000 acre-feet Average end of October carryover storage 148,640 acre-feet Full pool; achieved roughly 3 out of 4 years

1.1.4 Crooked River ESA requirements The 2005 Biological Opinion on future Operations and Maintenance of Reclamation projects in the Deschutes River Basin included an Incidental Take Statement to minimize the take of Mid Columbia Steelhead (USBR, 2005). The statement requires that one of the following statements be true from October 1 though November 15:

• The seven day average flow Crooked River below Opal Springs is greater than or equal to 1,200 cfs.

• The seven-day moving average flow of the Deschutes River near Culver added to the flow at the Crooked River below Opal Springs is greater than or equal to 1,680 cfs.

• The average Bowman Dam release is greater than or equal to 215 cfs.

1.0 Introduction

9

1.2 Objectives

This study is designed to develop 2010 level naturalized and modified flows for the Deschutes River Basin into Lake Billy Chinook. The total inflow to Lake Billy Chinook is the sum of surface water and groundwater contributions from the Deschutes and Little Deschutes Rivers, Tumalo and Squaw Creeks in the Deschutes River Basin, as well as subsurface contributions to the Deschutes River Basin from the Metolius and Crooked River Basins. Naturalized flows (flows that would occur without regulation or irrigation) into Lake Billy Chinook are presented and described in Chapter 4. The modified flows are described in Chapter 4 and are presented as a time series of monthly data into Lake Billy Chinook from water years 1929 through 2008 (80 years). Data is displayed as both average flow in cfs and average monthly volume in acre-feet.

2.0 Deschutes Naturalized Flows

11

2.0 Deschutes Naturalized flows The MODSIM 8.0 reservoir simulation model of the Deschutes and Crooked Rivers was used for the analyses described in this report. The model was developed over many years in a collaborative effort between the Oregon Department of Water Resources, Natural Resources Consulting Engineers, Inc., and Reclamation. Naturalized flows are flows that would have occurred in the river without reservoir regulation or irrigation demands. The difference between naturalized and NRNI flows (no regulation, no irrigation) is that an attempt has been made to remove the lagged effects of past irrigation and groundwater use. When water is applied to irrigated lands, excess water can seep below the root zone and travel, via the aquifer, back to the river. The time it takes for that water to return to the river is described by a time dependant function known as a groundwater response function. Response functions are also used to describe the lagged effect on the river due to pumping water from the aquifer. The response functions for the Deschutes model were calculated using a groundwater model of the basin (Gannett and Lite, 2004). In addition, the groundwater model describes where the water returns to the system and these locations are incorporated into the MODSIM model. Naturalized flows are often calculated as the first set of input to a distribution model at various points along the river. Since inflows into Lake Billy Chinook are a combination of flows from different locations, the MODSIM model is used to calculate inflows to the lake that would result from naturalized flows elsewhere on the river. All reservoir regulation and irrigation demands, along with lagged groundwater impacts, are removed from this model run. Tables 2-1 and 2-2 show the natural flows into Lake Billy Chinook in acre-feet per month and cubic feet per second (cfs), respectively. Naturalized flows were created by modeling for 1929-2005. They were not created for 2006-2008. In the creation of the modified flows data set (Chapter 3) historic flows were used for 2006-2008 to reflect current conditions because complete diversion records for that most recent period are not yet available.

2.0 Deschutes Naturalized Flows

12

Table 2-1: Naturalized flow into Lake Billy Chinook for water years 1929-2005 (acre-feet per month).

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1929 233,244 220,709 217,777 226,498 236,145 289,297 305,303 300,262 264,490 244,544 214,830 228,327 1930 233,244 219,661 233,923 222,157 258,933 242,410 247,700 234,468 222,750 220,145 214,651 203,382 1931 204,112 190,256 193,197 205,918 190,208 217,799 248,864 230,175 211,073 194,204 199,004 187,577 1932 188,206 181,728 190,698 210,007 215,754 290,395 289,470 325,596 280,291 233,393 219,156 208,832 1933 215,086 215,827 214,097 234,191 213,344 256,995 275,253 305,840 386,561 269,369 240,093 234,035 1934 233,244 219,810 273,183 311,604 249,173 276,285 272,557 253,701 225,283 237,600 214,830 223,238 1935 233,244 199,265 236,496 249,445 237,041 256,183 281,412 313,659 296,190 237,600 228,589 225,720 1936 225,871 210,583 212,647 267,960 247,298 275,231 330,192 348,111 295,555 237,600 232,195 225,720 1937 225,794 208,663 215,577 225,223 219,118 261,100 301,461 320,400 314,824 237,600 224,096 225,720 1938 233,244 226,488 265,345 301,785 290,140 368,141 406,732 398,948 315,726 258,043 240,843 232,810 1939 233,244 233,818 239,114 239,908 231,355 270,583 281,606 283,870 230,601 237,600 216,782 225,720 1940 229,815 201,471 219,942 229,097 244,174 289,959 280,847 244,254 222,750 220,622 214,830 215,038 1941 224,533 198,507 206,267 213,959 201,611 229,389 247,700 230,175 222,750 211,437 213,143 206,780 1942 213,932 199,980 235,119 215,751 231,757 239,388 283,786 243,084 222,750 229,903 214,830 217,306 1943 225,241 235,929 312,281 364,293 334,776 353,010 456,135 390,050 357,137 307,239 266,070 253,511 1944 264,420 253,710 248,956 248,348 238,123 257,483 247,700 243,299 238,331 237,600 218,426 214,247 1945 229,179 199,183 198,607 223,216 245,752 227,966 255,547 313,161 243,792 237,600 216,390 225,720 1946 233,244 214,030 250,750 304,157 246,543 310,660 360,635 382,319 333,860 277,324 248,821 239,147 1947 243,765 248,277 290,178 260,264 276,937 296,863 289,803 298,661 278,263 247,818 233,318 227,158 1948 245,773 215,878 209,760 267,521 253,672 281,708 296,161 368,815 406,220 277,249 255,911 243,122 1949 236,838 224,788 236,832 221,508 295,155 342,421 379,007 458,717 362,680 283,838 263,784 243,406 1950 251,234 235,675 245,598 247,172 280,112 370,580 380,562 404,970 447,981 307,682 305,413 269,738 1951 294,988 319,521 363,194 384,701 432,029 395,903 448,266 470,603 385,495 317,350 306,758 283,472 1952 293,944 270,717 287,921 285,733 327,976 357,271 499,684 481,148 414,488 334,131 286,749 270,529 1953 277,210 255,749 265,212 383,550 386,596 348,662 356,680 429,744 403,858 361,145 281,275 272,468 1954 291,842 291,936 343,922 350,229 359,665 387,685 399,798 429,848 386,844 345,830 277,232 271,893 1955 266,226 240,993 264,236 290,873 256,384 290,361 303,378 350,471 390,737 300,684 268,245 267,530 1956 280,079 285,770 390,089 435,843 341,692 396,671 456,109 559,821 463,245 350,327 306,896 287,455 1957 301,742 287,369 332,333 284,508 307,966 418,604 409,875 427,705 363,436 294,944 278,507 267,548 1958 278,799 246,582 294,125 322,126 406,640 365,688 389,649 458,607 414,616 329,587 275,583 264,061 1959 274,285 289,183 301,073 321,253 289,366 311,898 327,602 329,379 308,252 262,744 255,297 251,084 1960 260,730 237,722 236,571 240,398 256,557 347,566 316,417 343,319 354,157 289,223 250,650 242,011 1961 244,690 254,669 244,272 255,513 368,419 353,087 337,598 345,553 340,721 278,278 255,196 246,112 1962 237,883 226,120 239,826 241,774 251,108 298,336 439,761 343,602 296,813 264,895 261,227 235,801 1963 250,614 247,864 269,266 236,337 350,779 285,039 340,595 352,928 273,827 251,415 244,920 236,354 1964 235,716 228,606 228,950 226,399 224,033 266,219 326,029 292,874 304,816 271,451 248,737 265,234 1965 254,434 234,684 535,471 446,336 408,143 360,598 407,373 372,376 328,191 306,225 284,500 261,397 1966 268,330 247,755 253,151 254,233 231,050 319,248 345,634 317,180 294,783 268,024 250,154 244,233 1967 252,593 236,257 266,969 256,870 250,255 286,066 298,009 368,840 322,394 260,920 236,918 234,009 1968 246,444 232,300 230,752 241,437 283,589 282,292 247,700 258,580 246,299 237,600 237,841 225,720 1969 236,121 247,486 238,681 255,819 225,896 292,450 417,132 350,111 348,601 265,610 248,044 247,781 1970 255,666 210,711 234,954 382,947 311,883 333,164 306,931 310,589 287,954 255,718 238,272 240,637 1971 255,627 262,734 264,970 364,485 323,770 359,672 390,390 390,468 355,765 319,593 284,193 271,885 1972 280,146 269,961 296,786 327,081 352,063 633,343 401,638 383,754 376,884 344,572 308,858 300,716 1973 300,903 268,336 295,411 294,692 268,422 304,655 290,913 292,522 262,762 248,245 235,502 233,215 1974 254,103 293,762 357,970 377,918 286,548 419,312 451,295 426,398 404,058 359,087 305,523 289,321 1975 293,689 272,997 295,702 301,705 284,249 363,807 380,406 436,596 364,570 344,044 294,131 277,778 1976 291,012 281,362 322,182 328,652 302,363 344,116 413,269 382,780 326,729 320,554 307,465 267,083 1977 265,881 246,025 250,791 244,832 226,428 242,051 247,700 257,697 239,089 237,600 220,998 228,166

2.0 Deschutes Naturalized Flows

13

1978 233,244 242,917 341,974 317,771 297,208 377,102 351,547 318,842 268,746 244,029 235,669 231,505 1979 233,244 213,711 223,270 222,590 343,817 437,026 356,642 358,072 249,842 240,234 226,772 225,720 1980 233,244 205,341 219,047 291,155 307,475 331,208 331,274 301,812 253,676 237,600 218,979 225,720 1981 233,244 215,097 264,545 246,403 291,549 308,489 293,954 277,201 268,253 237,600 216,554 225,720 1982 233,244 203,874 338,149 272,685 436,057 411,739 371,769 386,271 360,312 314,582 276,647 274,044 1983 255,873 248,245 271,340 302,409 367,165 510,973 441,392 451,930 358,900 323,870 293,660 277,575 1984 266,131 275,093 303,160 317,742 350,270 526,944 516,085 466,973 380,417 326,849 298,172 276,872 1985 278,287 334,509 295,760 267,115 253,039 352,966 443,657 331,971 319,475 279,184 257,251 249,757 1986 251,533 245,183 232,613 266,195 400,778 514,964 361,526 334,462 307,457 262,409 239,386 242,228 1987 243,115 242,318 238,038 238,800 264,090 352,963 337,872 303,086 251,113 255,319 231,734 225,720 1988 233,244 212,789 228,297 234,914 240,473 272,193 281,979 272,796 265,470 241,175 218,093 225,720 1989 233,244 226,139 226,353 223,865 235,062 406,680 414,733 357,897 294,656 259,125 234,684 225,720 1990 233,244 217,273 222,867 243,150 225,124 270,580 277,682 274,584 258,820 242,662 234,924 225,720 1991 233,244 209,436 212,921 222,295 221,472 249,405 258,626 277,108 256,609 242,431 224,175 225,720 1992 233,244 217,541 232,609 223,178 232,078 253,862 247,700 237,731 222,750 237,600 218,691 225,720 1993 233,244 199,940 201,033 206,064 213,012 489,256 447,499 419,357 329,164 269,192 242,949 239,805 1994 233,244 208,855 214,410 223,723 205,722 254,118 266,170 257,766 240,629 237,600 217,567 225,720 1995 233,244 195,086 208,156 245,725 322,387 323,483 275,046 299,843 276,806 261,717 217,816 226,328 1996 239,767 265,316 327,934 330,674 512,776 387,403 366,414 384,504 319,864 293,261 276,225 275,483 1997 287,729 303,403 412,401 506,615 409,985 443,119 417,685 397,758 364,866 333,605 298,367 293,049 1998 306,180 289,042 274,162 295,089 297,730 383,460 362,033 432,758 385,508 302,221 286,224 260,338 1999 265,101 274,686 302,256 317,533 297,962 444,069 440,913 440,432 392,746 353,849 316,751 278,964 2000 285,501 291,058 284,526 283,696 314,972 388,524 438,415 352,603 320,579 290,536 255,589 249,354 2001 256,413 241,174 240,999 236,973 226,394 278,098 276,183 286,479 256,178 241,993 228,555 225,720 2002 233,244 219,614 237,893 261,092 219,436 281,082 349,031 304,792 298,945 252,988 227,817 225,720 2003 233,244 214,697 228,365 259,681 259,931 290,452 294,977 282,840 264,493 237,600 221,184 225,720 2004 233,244 213,987 227,158 244,015 282,489 391,024 335,008 340,672 295,750 260,224 231,169 230,387 2005 233,244 209,449 226,761 220,896 209,174 273,100 289,504 340,855 249,002 237,600 214,830 225,720

2.0 Deschutes Naturalized Flows

14

Table 2-2: Naturalized flow into Lake Billy Chinook for water years 1929-2005 (cfs). Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1929 3,793 3,709 3,542 3,684 4,252 4,705 5,131 4,883 4,445 3,977 3,494 3,837 1930 3,793 3,692 3,804 3,613 4,662 3,942 4,163 3,813 3,743 3,580 3,491 3,418 1931 3,320 3,197 3,142 3,349 3,425 3,542 4,182 3,743 3,547 3,158 3,236 3,152 1932 3,061 3,054 3,101 3,415 3,885 4,723 4,865 5,295 4,710 3,796 3,564 3,510 1933 3,498 3,627 3,482 3,809 3,841 4,180 4,626 4,974 6,496 4,381 3,905 3,933 1934 3,793 3,694 4,443 5,068 4,487 4,493 4,580 4,126 3,786 3,864 3,494 3,752 1935 3,793 3,349 3,846 4,057 4,268 4,166 4,729 5,101 4,978 3,864 3,718 3,793 1936 3,673 3,539 3,458 4,358 4,453 4,476 5,549 5,661 4,967 3,864 3,776 3,793 1937 3,672 3,507 3,506 3,663 3,945 4,246 5,066 5,211 5,291 3,864 3,645 3,793 1938 3,793 3,806 4,315 4,908 5,224 5,987 6,835 6,488 5,306 4,197 3,917 3,913 1939 3,793 3,929 3,889 3,902 4,166 4,401 4,733 4,617 3,875 3,864 3,526 3,793 1940 3,738 3,386 3,577 3,726 4,397 4,716 4,720 3,972 3,743 3,588 3,494 3,614 1941 3,652 3,336 3,355 3,480 3,630 3,731 4,163 3,743 3,743 3,439 3,466 3,475 1942 3,479 3,361 3,824 3,509 4,173 3,893 4,769 3,953 3,743 3,739 3,494 3,652 1943 3,663 3,965 5,079 5,925 6,028 5,741 7,666 6,344 6,002 4,997 4,327 4,260 1944 4,300 4,264 4,049 4,039 4,288 4,188 4,163 3,957 4,005 3,864 3,552 3,601 1945 3,727 3,347 3,230 3,630 4,425 3,708 4,295 5,093 4,097 3,864 3,519 3,793 1946 3,793 3,597 4,078 4,947 4,439 5,052 6,061 6,218 5,611 4,510 4,047 4,019 1947 3,964 4,172 4,719 4,233 4,987 4,828 4,870 4,857 4,676 4,030 3,795 3,818 1948 3,997 3,628 3,411 4,351 4,568 4,582 4,977 5,998 6,827 4,509 4,162 4,086 1949 3,852 3,778 3,852 3,602 5,315 5,569 6,369 7,460 6,095 4,616 4,290 4,091 1950 4,086 3,961 3,994 4,020 5,044 6,027 6,396 6,586 7,529 5,004 4,967 4,533 1951 4,798 5,370 5,907 6,257 7,779 6,439 7,533 7,654 6,478 5,161 4,989 4,764 1952 4,781 4,550 4,683 4,647 5,906 5,810 8,397 7,825 6,966 5,434 4,664 4,546 1953 4,508 4,298 4,313 6,238 6,961 5,670 5,994 6,989 6,787 5,873 4,575 4,579 1954 4,746 4,906 5,593 5,696 6,476 6,305 6,719 6,991 6,501 5,624 4,509 4,569 1955 4,330 4,050 4,297 4,731 4,616 4,722 5,098 5,700 6,567 4,890 4,363 4,496 1956 4,555 4,803 6,344 7,088 6,152 6,451 7,665 9,105 7,785 5,698 4,991 4,831 1957 4,907 4,829 5,405 4,627 5,545 6,808 6,888 6,956 6,108 4,797 4,529 4,496 1958 4,534 4,144 4,783 5,239 7,322 5,947 6,548 7,459 6,968 5,360 4,482 4,438 1959 4,461 4,860 4,896 5,225 5,210 5,073 5,506 5,357 5,180 4,273 4,152 4,220 1960 4,240 3,995 3,847 3,910 4,620 5,653 5,318 5,584 5,952 4,704 4,076 4,067 1961 3,980 4,280 3,973 4,156 6,634 5,742 5,674 5,620 5,726 4,526 4,150 4,136 1962 3,869 3,800 3,900 3,932 4,521 4,852 7,390 5,588 4,988 4,308 4,248 3,963 1963 4,076 4,165 4,379 3,844 6,316 4,636 5,724 5,740 4,602 4,089 3,983 3,972 1964 3,834 3,842 3,724 3,682 4,034 4,330 5,479 4,763 5,123 4,415 4,045 4,457 1965 4,138 3,944 8,709 7,259 7,349 5,865 6,846 6,056 5,515 4,980 4,627 4,393 1966 4,364 4,164 4,117 4,135 4,160 5,192 5,809 5,158 4,954 4,359 4,068 4,104 1967 4,108 3,970 4,342 4,178 4,506 4,652 5,008 5,999 5,418 4,243 3,853 3,933 1968 4,008 3,904 3,753 3,927 5,106 4,591 4,163 4,205 4,139 3,864 3,868 3,793 1969 3,840 4,159 3,882 4,160 4,067 4,756 7,010 5,694 5,858 4,320 4,034 4,164 1970 4,158 3,541 3,821 6,228 5,616 5,418 5,158 5,051 4,839 4,159 3,875 4,044 1971 4,157 4,415 4,309 5,928 5,830 5,850 6,561 6,350 5,979 5,198 4,622 4,569 1972 4,556 4,537 4,827 5,319 6,339 10,30

0 6,750 6,241 6,334 5,604 5,023 5,054

1973 4,894 4,510 4,804 4,793 4,833 4,955 4,889 4,757 4,416 4,037 3,830 3,919 1974 4,133 4,937 5,822 6,146 5,160 6,819 7,584 6,935 6,790 5,840 4,969 4,862 1975 4,776 4,588 4,809 4,907 5,118 5,917 6,393 7,101 6,127 5,595 4,784 4,668 1976 4,733 4,728 5,240 5,345 5,444 5,597 6,945 6,225 5,491 5,213 5,000 4,488 1977 4,324 4,135 4,079 3,982 4,077 3,937 4,163 4,191 4,018 3,864 3,594 3,834 1978 3,793 4,082 5,562 5,168 5,352 6,133 5,908 5,185 4,516 3,969 3,833 3,891

2.0 Deschutes Naturalized Flows

15

1979 3,793 3,592 3,631 3,620 6,191 7,108 5,994 5,823 4,199 3,907 3,688 3,793 1980 3,793 3,451 3,562 4,735 5,536 5,387 5,567 4,909 4,263 3,864 3,561 3,793 1981 3,793 3,615 4,302 4,007 5,250 5,017 4,940 4,508 4,508 3,864 3,522 3,793 1982 3,793 3,426 5,499 4,435 7,852 6,696 6,248 6,282 6,055 5,116 4,499 4,605 1983 4,161 4,172 4,413 4,918 6,611 8,310 7,418 7,350 6,032 5,267 4,776 4,665 1984 4,328 4,623 4,930 5,168 6,307 8,570 8,673 7,595 6,393 5,316 4,849 4,653 1985 4,526 5,622 4,810 4,344 4,556 5,740 7,456 5,399 5,369 4,540 4,184 4,197 1986 4,091 4,120 3,783 4,329 7,216 8,375 6,076 5,440 5,167 4,268 3,893 4,071 1987 3,954 4,072 3,871 3,884 4,755 5,740 5,678 4,929 4,220 4,152 3,769 3,793 1988 3,793 3,576 3,713 3,821 4,330 4,427 4,739 4,437 4,461 3,922 3,547 3,793 1989 3,793 3,800 3,681 3,641 4,233 6,614 6,970 5,821 4,952 4,214 3,817 3,793 1990 3,793 3,651 3,625 3,954 4,054 4,401 4,667 4,466 4,350 3,947 3,821 3,793 1991 3,793 3,520 3,463 3,615 3,988 4,056 4,346 4,507 4,312 3,943 3,646 3,793 1992 3,793 3,656 3,783 3,630 4,179 4,129 4,163 3,866 3,743 3,864 3,557 3,793 1993 3,793 3,360 3,269 3,351 3,835 7,957 7,520 6,820 5,532 4,378 3,951 4,030 1994 3,793 3,510 3,487 3,639 3,704 4,133 4,473 4,192 4,044 3,864 3,538 3,793 1995 3,793 3,279 3,385 3,996 5,805 5,261 4,622 4,876 4,652 4,256 3,542 3,804 1996 3,899 4,459 5,333 5,378 9,233 6,301 6,158 6,253 5,375 4,769 4,492 4,630 1997 4,679 5,099 6,707 8,239 7,382 7,207 7,019 6,469 6,132 5,426 4,852 4,925 1998 4,980 4,858 4,459 4,799 5,361 6,236 6,084 7,038 6,479 4,915 4,655 4,375 1999 4,311 4,616 4,916 5,164 5,365 7,222 7,410 7,163 6,600 5,755 5,151 4,688 2000 4,643 4,891 4,627 4,614 5,671 6,319 7,368 5,735 5,388 4,725 4,157 4,191 2001 4,170 4,053 3,919 3,854 4,076 4,523 4,641 4,659 4,305 3,936 3,717 3,793 2002 3,793 3,691 3,869 4,246 3,951 4,571 5,866 4,957 5,024 4,114 3,705 3,793 2003 3,793 3,608 3,714 4,223 4,680 4,724 4,957 4,600 4,445 3,864 3,597 3,793 2004 3,793 3,596 3,694 3,969 5,086 6,359 5,630 5,541 4,970 4,232 3,760 3,872 2005 3,793 3,520 3,688 3,593 3,766 4,442 4,865 5,543 4,185 3,864 3,494 3,793

3.0 Deschutes Modified Flows

17

3.0 Deschutes Modified Flows Modified flows are flows that represent 2010 level reservoir operations and irrigation demand levels throughout the period of record, 1929-2008. The Deschutes MODSIM model was used to develop the Modified Flows dataset from 1929-2005. Actual inflows to Lake Billy Chinook provided by Portland General Electric were used to complete the dataset from 2006-2008. The 2010 level demands were developed using data covering the period of 1993-2004. This period was used because it covered the extreme (wet, medium, and dry) water year conditions for the basin, and because more current (2006-2008) diversion records are not yet available. Since the diversions are largely made up of irrigation demands, increases in population were not assumed to have had a large impact between 1993 and 2008. Conservation and groundwater mitigation efforts were also assumed to not have a detectable effect on the demand data (OWRD, 2008). For demands on the Deschutes River, three hydrologic states for each diversion were calculated by first determining wet, medium and dry years based on the inflow volume for Crane Prairie Reservoir. For the Crooked River, four hydrologic states were calculated for each diversion based on the inflow volume for Prineville Reservoir. The historical diversions were averaged based on hydrologic state and entered into the model. The reservoir operating rules used in the Modified Flows model run were equivalent to those expected in 2010, including ESA requirements for Prineville. For the Modified Flows analysis, the model was corrected for groundwater responses based on 2010 level demands. In the Deschutes basin, it can take up to 50 years for the system to equilibrate with respect to groundwater responses. The model begins its calculation period in 1929. If one were to calculate equilibrium groundwater responses based on current irrigation demands, the model would have to begin its calculation period in 1879. Since that is not feasible due to lack of available data for 1879-1929, it was necessary to calculate equilibrium groundwater response hydrographs, and input them directly into the Modified Flows MODSIM model. In other words, the equilibrium groundwater return flows were calculated separately and “hardwired” into the model. These equilibrium responses were calculated in several steps. Since the model reaches an equilibrium condition in 1979, 50 years after the start of the model, the first step was to model the 1929-2005 period using current (1993-2005) irrigation demands. This created a hydrograph of groundwater responses under equilibrium conditions for the 1979-2005 period (26 years of running record). This

3.0 Deschutes Modified Flows

18

equilibrium dataset was then copied to create the 26 years of hydrographs from 1929-1955, and again for the 22 years from 1956 to 1978. The hydrographs were developed for each response location in the basin and input directly into the Modified Flows MODSIM model. The function in the model that would normally calculate the groundwater responses was turned off in subsequent model run so as to not double count the groundwater return flows from irrigation diversion. Tables 3-1 and 3-2 show the 2010 Level Modified Flows dataset in monthly acre-feet and average cfs, respectively. Table 3-1: 2010 Modified Flows into Lake Billy Chinook for water years 1928-2008 in acre-feet.

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1928 238,678 235,400 237,853 230,097 218,952 267,665 243,159 235,624 222,137 214,056 214,762 208,479 1929 267,075 244,746 237,192 282,075 254,603 278,010 265,661 231,247 223,783 239,347 216,971 227,254 1930 234,387 219,843 240,559 190,019 227,662 220,894 248,211 240,731 224,110 239,366 197,508 212,488 1931 211,340 202,283 207,004 184,468 166,597 214,994 248,449 241,249 211,925 208,864 203,790 203,798 1932 200,593 192,277 207,781 223,571 183,979 223,173 267,566 240,343 224,158 239,193 216,734 227,561 1933 231,852 200,772 195,599 215,759 186,113 215,295 277,597 230,625 231,662 239,217 216,892 227,009 1934 234,376 199,739 240,326 281,155 224,184 254,171 248,363 241,166 223,058 239,232 216,078 195,476 1935 209,591 225,541 223,310 229,054 195,190 226,902 248,020 240,911 223,822 238,988 216,861 213,018 1936 214,128 203,170 201,580 232,435 204,504 223,897 255,953 240,688 223,464 239,244 216,731 227,092 1937 234,577 193,244 202,645 188,066 189,617 220,661 265,529 231,267 223,531 239,280 216,675 227,317 1938 234,202 213,251 241,890 247,679 210,419 288,955 431,831 301,992 223,996 239,331 216,853 227,451 1939 234,088 212,973 237,589 243,032 226,221 262,327 248,702 241,103 223,929 239,307 216,912 227,301 1940 234,238 186,711 200,318 205,116 204,461 253,556 255,868 241,229 224,327 238,842 216,963 226,698 1941 226,874 187,448 199,316 196,677 175,716 230,946 248,246 240,445 223,554 226,642 202,930 221,405 1942 223,840 209,227 215,505 197,390 191,671 215,402 256,101 240,205 223,669 239,248 216,801 227,408 1943 234,198 207,310 263,569 299,310 265,440 343,709 480,341 303,511 255,120 252,970 218,658 227,688 1944 262,925 244,941 253,117 251,437 240,461 245,246 248,117 240,931 223,278 239,209 216,585 227,242 1945 234,368 190,873 194,181 204,636 195,862 215,294 256,202 240,029 224,095 239,418 216,798 227,242 1946 234,214 195,947 219,384 283,690 194,453 288,773 392,019 293,429 248,511 239,292 216,553 227,258 1947 247,711 250,174 300,097 260,609 265,409 292,886 268,770 241,021 223,424 238,878 216,443 227,435 1948 234,462 230,062 224,782 267,706 224,874 239,546 277,179 321,253 345,105 239,102 220,438 226,994 1949 253,892 229,375 239,808 229,368 282,187 357,799 389,839 348,609 269,041 239,292 224,309 227,427 1950 244,400 235,739 262,295 241,414 259,462 337,662 401,451 309,384 344,883 265,193 264,176 234,182 1951 301,880 325,418 393,356 381,405 420,920 404,440 479,248 385,953 290,805 264,146 258,252 241,429 1952 301,222 274,457 306,516 289,992 321,677 375,696 589,033 390,504 322,637 287,338 250,139 241,669 1953 283,017 255,228 282,377 382,405 367,866 342,430 389,816 363,719 327,905 315,534 243,023 248,874 1954 305,075 307,932 370,439 346,058 345,304 376,728 406,851 336,960 292,183 291,781 248,193 240,463 1955 274,250 258,431 280,987 303,221 265,864 291,335 265,677 258,055 299,768 250,224 232,279 243,690 1956 293,757 280,233 405,275 443,631 332,124 421,144 502,631 491,518 372,465 306,199 278,205 269,840 1957 317,237 295,323 343,100 291,704 315,884 437,414 417,898 332,290 277,175 248,217 235,939 237,835 1958 297,413 247,527 283,313 328,361 487,405 370,148 415,723 380,687 336,292 297,475 255,316 234,091 1959 290,569 284,138 318,346 327,796 292,620 320,625 280,235 240,688 228,088 239,414 224,790 230,939 1960 267,086 247,995 255,011 259,807 269,709 337,330 302,745 245,074 257,534 247,143 230,470 227,522 1961 247,355 254,860 259,063 264,361 342,322 342,228 319,484 250,722 256,487 239,465 236,372 231,225 1962 258,031 249,232 278,156 285,226 272,234 304,612 426,897 277,620 236,286 239,374 245,153 227,666 1963 276,353 263,807 303,364 280,184 369,437 313,917 313,551 283,847 223,755 239,221 223,573 232,689 1964 257,724 252,302 261,659 254,526 239,172 270,827 262,446 241,154 223,523 239,157 216,612 227,364 1965 259,407 240,758 557,110 461,070 403,290 358,250 386,267 288,918 262,849 261,928 267,482 232,208 1966 265,979 250,930 265,889 279,939 256,172 297,362 305,776 241,260 223,929 238,980 216,916 227,364 1967 257,800 238,684 276,122 276,753 250,635 274,351 278,565 288,871 245,917 239,556 217,176 227,711

3.0 Deschutes Modified Flows

19

1968 253,759 238,913 242,097 241,803 273,334 291,457 248,480 240,778 224,043 239,453 216,088 227,427 1969 234,249 236,054 235,698 243,277 196,382 219,923 312,596 240,986 250,087 239,335 216,916 227,277 1970 249,923 224,810 240,073 391,356 313,333 316,262 286,651 241,182 223,921 239,485 217,050 227,183 1971 256,505 263,152 269,760 377,989 306,167 336,755 373,904 310,219 278,527 261,892 253,821 231,805 1972 292,913 276,577 310,994 347,536 345,162 632,801 380,890 295,826 306,765 294,812 276,021 256,130 1973 327,600 271,288 290,669 327,538 280,226 298,765 265,325 240,986 224,217 239,516 216,869 227,136 1974 258,608 297,522 343,776 409,596 290,187 396,873 447,937 365,450 339,453 316,490 268,328 267,083 1975 314,533 291,395 327,424 331,827 308,353 365,445 331,855 366,390 320,956 307,254 279,051 244,821 1976 314,645 295,374 351,972 355,404 316,347 339,359 385,411 325,547 274,886 277,089 298,112 247,204 1977 286,420 264,241 279,094 284,301 262,573 282,108 248,726 240,119 224,304 239,359 216,731 226,927 1978 240,694 252,371 354,220 335,940 272,050 330,043 312,431 250,244 223,767 239,221 216,533 227,139 1979 254,191 239,169 251,662 261,702 305,093 425,849 340,221 294,915 224,126 239,433 216,648 227,660 1980 254,073 240,621 254,162 311,959 272,784 299,455 315,643 240,790 223,456 239,370 216,782 227,250 1981 245,895 244,414 303,780 275,395 275,898 268,781 275,492 240,609 223,558 239,347 217,089 227,218 1982 257,039 244,960 358,894 306,833 409,425 372,341 355,288 329,552 309,574 287,088 248,564 266,129 1983 295,417 271,353 310,164 341,221 378,636 530,049 440,943 385,415 304,924 291,557 283,139 246,363 1984 293,728 291,241 335,512 354,349 352,168 541,525 519,190 399,051 325,950 293,318 266,320 261,560 1985 298,107 343,877 321,388 301,925 268,695 334,918 437,638 268,851 263,171 251,062 248,591 241,509 1986 274,209 270,150 277,339 307,449 431,382 561,446 363,050 262,289 258,456 239,114 230,910 237,770 1987 267,907 257,215 269,024 266,945 264,490 349,104 328,354 240,927 224,264 246,848 218,618 227,597 1988 259,042 241,926 263,899 266,437 236,066 269,410 268,288 240,947 223,984 239,504 216,920 227,518 1989 247,038 249,224 250,536 254,424 214,160 358,834 389,751 282,544 233,230 239,307 219,677 228,977 1990 260,479 240,802 246,046 260,329 234,184 287,838 256,566 240,715 224,122 239,319 216,596 227,727 1991 240,753 232,653 235,789 244,350 219,658 244,861 248,359 240,445 223,373 239,394 216,951 227,735 1992 234,261 231,911 250,462 234,066 220,809 232,366 248,117 241,296 223,692 238,889 216,995 227,443 1993 233,808 221,180 229,589 224,062 198,809 353,754 395,174 311,430 240,550 238,905 223,035 235,083 1994 263,014 227,517 233,517 239,227 216,749 266,321 248,433 240,868 224,067 239,611 216,995 227,581 1995 233,970 214,297 222,708 243,058 301,489 279,108 247,981 240,829 223,614 238,645 216,798 227,471 1996 249,821 263,477 325,221 326,802 467,673 351,273 343,371 301,176 249,654 242,298 245,895 232,352 1997 300,463 306,328 433,629 546,508 419,238 466,563 435,821 332,490 310,324 295,758 265,200 277,148 1998 331,243 304,003 293,547 321,429 309,352 364,357 350,315 358,152 328,533 259,881 259,493 238,844 1999 274,569 283,950 330,822 348,420 313,454 430,314 443,285 381,853 326,914 308,243 283,982 246,807 2000 303,672 305,589 308,976 305,761 326,079 375,625 417,816 269,519 251,951 242,434 233,652 235,235 2001 270,726 253,266 262,593 264,471 252,896 289,650 251,467 241,170 223,803 239,098 217,101 227,396 2002 242,790 242,082 253,364 283,806 220,940 246,884 279,765 240,809 228,687 239,390 217,565 227,372 2003 253,638 237,602 243,195 274,577 241,944 275,051 266,918 240,464 224,248 239,485 216,612 227,376 2004 252,035 231,049 255,775 261,623 250,300 329,383 288,820 252,757 225,138 239,244 220,600 227,222 2005 257,720 235,735 251,748 244,982 209,898 251,832 257,841 265,865 223,637 239,236 216,837 227,222 2006 248,041 248,965 289,606 444,986 303,566 312,541 433,011 308,791 276,873 245,335 235,559 228,853 2007 255,850 279,015 319,243 332,586 278,075 335,907 282,109 254,128 246,049 243,737 235,989 234,625 2008 269,377 276,813 298,584 281,183 250,362 296,247 280,443 309,651 276,575 255,296 243,368 236,053

3.0 Deschutes Modified Flows

20

Table 3-2: 2010 Modified Flows into Lake Billy Chinook for water years 1928-2008 in cfs. Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1928 3,882 3,956 3,868 3,742 3,942 4,353 4,086 3,832 3,733 3,481 3,493 3,504 1929 4,344 4,113 3,858 4,588 4,584 4,521 4,465 3,761 3,761 3,893 3,529 3,819 1930 3,812 3,695 3,912 3,090 4,099 3,592 4,171 3,915 3,766 3,893 3,212 3,571 1931 3,437 3,399 3,367 3,000 3,000 3,497 4,175 3,924 3,562 3,397 3,314 3,425 1932 3,262 3,231 3,379 3,636 3,313 3,630 4,497 3,909 3,767 3,890 3,525 3,824 1933 3,771 3,374 3,181 3,509 3,351 3,501 4,665 3,751 3,893 3,890 3,527 3,815 1934 3,812 3,357 3,909 4,573 4,037 4,134 4,174 3,922 3,749 3,891 3,514 3,285 1935 3,409 3,790 3,632 3,725 3,515 3,690 4,168 3,918 3,761 3,887 3,527 3,580 1936 3,482 3,414 3,278 3,780 3,682 3,641 4,301 3,914 3,755 3,891 3,525 3,816 1937 3,815 3,248 3,296 3,059 3,414 3,589 4,462 3,761 3,757 3,892 3,524 3,820 1938 3,809 3,584 3,934 4,028 3,789 4,699 7,257 4,911 3,764 3,892 3,527 3,822 1939 3,807 3,579 3,864 3,953 4,073 4,266 4,180 3,921 3,763 3,892 3,528 3,820 1940 3,810 3,138 3,258 3,336 3,682 4,124 4,300 3,923 3,770 3,884 3,529 3,810 1941 3,690 3,150 3,242 3,199 3,164 3,756 4,172 3,910 3,757 3,686 3,300 3,721 1942 3,640 3,516 3,505 3,210 3,451 3,503 4,304 3,907 3,759 3,891 3,526 3,822 1943 3,809 3,484 4,287 4,868 4,780 5,590 8,072 4,936 4,287 4,114 3,556 3,826 1944 4,276 4,116 4,117 4,089 4,330 3,989 4,170 3,918 3,752 3,890 3,522 3,819 1945 3,812 3,208 3,158 3,328 3,527 3,501 4,306 3,904 3,766 3,894 3,526 3,819 1946 3,809 3,293 3,568 4,614 3,501 4,696 6,588 4,772 4,176 3,892 3,522 3,819 1947 4,029 4,204 4,881 4,238 4,779 4,763 4,517 3,920 3,755 3,885 3,520 3,822 1948 3,813 3,866 3,656 4,354 4,049 3,896 4,658 5,225 5,800 3,889 3,585 3,815 1949 4,129 3,855 3,900 3,730 5,081 5,819 6,551 5,670 4,521 3,892 3,648 3,822 1950 3,975 3,962 4,266 3,926 4,672 5,492 6,747 5,032 5,796 4,313 4,296 3,936 1951 4,910 5,469 6,397 6,203 7,579 6,578 8,054 6,277 4,887 4,296 4,200 4,057 1952 4,899 4,612 4,985 4,716 5,792 6,110 9,899 6,351 5,422 4,673 4,068 4,061 1953 4,603 4,289 4,592 6,219 6,624 5,569 6,551 5,915 5,511 5,132 3,952 4,182 1954 4,962 5,175 6,025 5,628 6,218 6,127 6,837 5,480 4,910 4,745 4,036 4,041 1955 4,460 4,343 4,570 4,931 4,787 4,738 4,465 4,197 5,038 4,070 3,778 4,095 1956 4,778 4,709 6,591 7,215 5,980 6,849 8,447 7,994 6,259 4,980 4,525 4,535 1957 5,159 4,963 5,580 4,744 5,688 7,114 7,023 5,404 4,658 4,037 3,837 3,997 1958 4,837 4,160 4,608 5,340 8,776 6,020 6,986 6,191 5,652 4,838 4,152 3,934 1959 4,726 4,775 5,177 5,331 5,269 5,214 4,710 3,914 3,833 3,894 3,656 3,881 1960 4,344 4,168 4,147 4,225 4,856 5,486 5,088 3,986 4,328 4,019 3,748 3,824 1961 4,023 4,283 4,213 4,299 6,164 5,566 5,369 4,078 4,310 3,895 3,844 3,886 1962 4,196 4,188 4,524 4,639 4,902 4,954 7,174 4,515 3,971 3,893 3,987 3,826 1963 4,494 4,433 4,934 4,557 6,652 5,105 5,269 4,616 3,760 3,891 3,636 3,910 1964 4,191 4,240 4,255 4,139 4,307 4,405 4,411 3,922 3,756 3,890 3,523 3,821 1965 4,219 4,046 9,061 7,499 7,262 5,826 6,491 4,699 4,417 4,260 4,350 3,902 1966 4,326 4,217 4,324 4,553 4,613 4,836 5,139 3,924 3,763 3,887 3,528 3,821 1967 4,193 4,011 4,491 4,501 4,513 4,462 4,681 4,698 4,133 3,896 3,532 3,827 1968 4,127 4,015 3,937 3,933 4,922 4,740 4,176 3,916 3,765 3,894 3,514 3,822 1969 3,810 3,967 3,833 3,957 3,536 3,577 5,253 3,919 4,203 3,892 3,528 3,820 1970 4,065 3,778 3,904 6,365 5,642 5,144 4,817 3,922 3,763 3,895 3,530 3,818 1971 4,172 4,422 4,387 6,147 5,513 5,477 6,284 5,045 4,681 4,259 4,128 3,896 1972 4,764 4,648 5,058 5,652 6,215 10,292 6,401 4,811 5,155 4,795 4,489 4,304 1973 5,328 4,559 4,727 5,327 5,046 4,859 4,459 3,919 3,768 3,895 3,527 3,817 1974 4,206 5,000 5,591 6,661 5,225 6,455 7,528 5,943 5,705 5,147 4,364 4,488 1975 5,115 4,897 5,325 5,397 5,552 5,943 5,577 5,959 5,394 4,997 4,538 4,114 1976 5,117 4,964 5,724 5,780 5,696 5,519 6,477 5,295 4,620 4,506 4,848 4,154 1977 4,658 4,441 4,539 4,624 4,728 4,588 4,180 3,905 3,770 3,893 3,525 3,814

3.0 Deschutes Modified Flows

21

1978 3,915 4,241 5,761 5,464 4,899 5,368 5,251 4,070 3,761 3,891 3,522 3,817 1979 4,134 4,019 4,093 4,256 5,493 6,926 5,718 4,796 3,767 3,894 3,523 3,826 1980 4,132 4,044 4,134 5,074 4,912 4,870 5,305 3,916 3,755 3,893 3,526 3,819 1981 3,999 4,108 4,941 4,479 4,968 4,371 4,630 3,913 3,757 3,893 3,531 3,819 1982 4,180 4,117 5,837 4,990 7,372 6,056 5,971 5,360 5,203 4,669 4,043 4,472 1983 4,804 4,560 5,044 5,549 6,818 8,620 7,410 6,268 5,124 4,742 4,605 4,140 1984 4,777 4,894 5,457 5,763 6,341 8,807 8,725 6,490 5,478 4,770 4,331 4,396 1985 4,848 5,779 5,227 4,910 4,838 5,447 7,355 4,372 4,423 4,083 4,043 4,059 1986 4,460 4,540 4,510 5,000 7,767 9,131 6,101 4,266 4,343 3,889 3,755 3,996 1987 4,357 4,323 4,375 4,341 4,762 5,678 5,518 3,918 3,769 4,015 3,555 3,825 1988 4,213 4,066 4,292 4,333 4,251 4,382 4,509 3,919 3,764 3,895 3,528 3,824 1989 4,018 4,188 4,075 4,138 3,856 5,836 6,550 4,595 3,920 3,892 3,573 3,848 1990 4,236 4,047 4,002 4,234 4,217 4,681 4,312 3,915 3,766 3,892 3,523 3,827 1991 3,915 3,910 3,835 3,974 3,955 3,982 4,174 3,910 3,754 3,893 3,528 3,827 1992 3,810 3,897 4,073 3,807 3,976 3,779 4,170 3,924 3,759 3,885 3,529 3,822 1993 3,803 3,717 3,734 3,644 3,580 5,753 6,641 5,065 4,043 3,885 3,627 3,951 1994 4,278 3,824 3,798 3,891 3,903 4,331 4,175 3,917 3,766 3,897 3,529 3,825 1995 3,805 3,601 3,622 3,953 5,429 4,539 4,167 3,917 3,758 3,881 3,526 3,823 1996 4,063 4,428 5,289 5,315 8,421 5,713 5,771 4,898 4,196 3,941 3,999 3,905 1997 4,887 5,148 7,052 8,888 7,549 7,588 7,324 5,407 5,215 4,810 4,313 4,658 1998 5,387 5,109 4,774 5,228 5,570 5,926 5,887 5,825 5,521 4,227 4,220 4,014 1999 4,465 4,772 5,380 5,667 5,644 6,998 7,450 6,210 5,494 5,013 4,619 4,148 2000 4,939 5,136 5,025 4,973 5,871 6,109 7,022 4,383 4,234 3,943 3,800 3,953 2001 4,403 4,256 4,271 4,301 4,554 4,711 4,226 3,922 3,761 3,889 3,531 3,822 2002 3,949 4,068 4,121 4,616 3,978 4,015 4,702 3,916 3,843 3,893 3,538 3,821 2003 4,125 3,993 3,955 4,466 4,356 4,473 4,486 3,911 3,769 3,895 3,523 3,821 2004 4,099 3,883 4,160 4,255 4,507 5,357 4,854 4,111 3,784 3,891 3,588 3,819 2005 4,191 3,962 4,094 3,984 3,779 4,096 4,333 4,324 3,758 3,891 3,527 3,819 2006 4,034 4,184 4,710 7,237 5,466 5,083 7,277 5,022 4,653 3,990 3,831 3,846 2007 4,161 4,689 5,192 5,409 5,007 5,463 4,741 4,133 4,135 3,964 3,838 3,943 2008 4,381 4,652 4,856 4,573 4,508 4,818 4,713 5,036 4,648 4,152 3,958 3,967

3.0 Deschutes Modified Flows

22

3.1 Comparison of year 2000 Modified Flows and year 2010 Modified flows

The modified flows that were calculated in the 2010 level of development update are slightly different than the 2000 modified flows data set. This is because in the 2000 modified flows calculation, groundwater return flows were not adjusted to reflect a steady state condition. The 2010 modified flows data set is considered a more accurate estimation of 2010 conditions because all years reflect the same current level of groundwater impacts. The differences in annual volume and peaks for 1990-1999 (the last ten years of overlap in the two datasets) are presented in Table 3-3. The annual volumes for the 2000 dataset are one percent larger than the 2010 dataset on average. The annual maximums for 2000 are 5 percent larger than the 2010 dataset average. The annual minimums are less than 1 percent different. Table 3-4 shows the comparison of the 2010 dataset to actual inflows to Lake Billy Chinook for 2000-2005. The annual volumes for the 2010 dataset are 1 percent larger than the actual inflows. The annual maximum actual inflows are 2 percent larger than then 2010 dataset. The annual minimum actual inflows are 5 percent larger than the 2010 dataset. The differences in these datasets are considered negligible. Table 3-3: Comparison of the 2010 Modified Flows dataset to the 2000 Modified Flows dataset for years 1990-1999 (the last 10 years of overlap). Annual Volume Annual Maximum Annual Minimum

2010 2000 2010 2000 2010 2000

1990 2,934,723 2,931,927 287,838 285,202 216,596 213,014 1991 2,814,321 2,859,927 248,359 269,655 216,951 213,602 1992 2,800,307 2,882,859 250,462 274,810 216,995 215,512 1993 3,105,379 3,376,369 395,174 451,135 198,809 221,457 1994 2,843,900 2,801,253 266,321 263,698 216,749 206,887 1995 2,889,968 3,057,022 301,489 344,972 214,297 221,785 1996 3,599,013 3,612,385 467,673 494,923 232,352 231,363 1997 4,389,470 4,311,327 546,508 557,172 265,200 256,832 1998 3,719,149 3,785,940 364,357 385,530 238,844 235,893 1999 3,972,613 3,899,486 443,285 445,904 246,807 254,442

Averages 3,306,884 3,351,849 357,147 377,300 226,360 227,079 % differences 1% 5% 0%

3.0 Deschutes Modified Flows

23

Table 3-4: Comparison of the 2010 Modified Flows dataset to actual inflows into Lake Billy Chinook for years 2000-1995. Annual Volume Annual Maximum Annual Minimum

2010 Actual 2010 Actual 2010 Actual

2000 3,576,309 3,739,930 417,816 385,408 233,652 256,463 2001 2,993,637 3,111,051 289,650 294,771 217,101 222,902 2002 2,923,454 3,066,121 283,806 291,205 217,565 225,878 2003 2,941,110 2,960,496 275,051 278,785 216,612 220,939 2004 3,033,946 3,171,265 329,383 348,573 220,600 229,031 2005 2,882,553 2,958,766 265,865 287,024 209,898 223,319

Averages 3,058,502 3,167,938 310,262 314,294 219,238 229,755 % differences 3% 1% 5%

Figure 3-1 shows the comparison of the 2010 Modified Flows data set to the 2000 Modified Flows data set and actual inflows into Lake Billy Chinook. The 2000 data set extends through 1999 and the actual inflows data set is shown from January 1999 through December 2008.

3.0 Deschutes Modified Flows

24

Figure 3-1: 2010 Modified Flows data set compared with the 2000 Modified Flows data set and actual inflows into Lake Billy Chinook for water years 1985-2008.

200,000

250,000

300,000

350,000

400,000

450,000

500,000

550,000

600,000

Oct-85 Sep-90 Sep-95 Sep-00 Sep-05

Acr

e-fe

et p

er m

on

th

Actual Flows into Lake Billy Chinook 2000 Modified Flows 2010 Modified Flows Dataset

4.0 References

25

4.0 References Gannett, Marshall and Kenneth Lite (2004). Simulation of Regional Ground-

Water Flow in the Upper Deschutes Basin, Oregon. WR 03-4195. Portland, Oregon.

State of Oregon, Water Resources Department (OWRD) (2008). Deschutes

Ground Water Mitigation Program, Five-Year Program Evaluation Report. Oregon.

U.S. Bureau of Reclamation (USBR) (2003). Biological Assessment on

Continued Operation and Maintenance of the Deschutes River Basin Projects and Effects on Essential Fish Habitat under the Magnuson-Stevens Act: Deschutes, Crooked River and Wapinitia Projects. Lower Columbia Area Office, Portland, Oregon.