icprb participation in phase 6 watershed model development€¦ · 11/12/2013 · 12/11/2013 4 ....
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ICPRB Participation in Phase 6 Watershed Model Development
Ross Mandel Interstate Commission on the Potomac River Basin
Chesapeake Bay Program Modeling Workgroup Meeting December 11, 2013
Background
• Maryland Department of the Environment is supporting ICPRB participation in Phase 6 development
• MDE-ICPRB partnership in Phase 5: – ICPRB participation in early Phase 5 calibration effort
– Periodic review of Phase 5 development
– ICPRB assisted in development of local sediment TMDL methodology (based on P5)
– ICPRB developed nutrient local TMDLs for MDE based on Phase 5 Model
12/11/2013 2
MDE Interests in Phase 6 Watershed Model
• MDE is interested in improving the performance of the Watershed Model at calibration stations upstream of Fall Line
– Improvements in simulation at a local scale would help improve acceptance of TMDL allocations by stakeholders
– Provide sounder basis for local nutrient and sediment TMDLs and consistent baseline for environmental management
3 12/11/2013
Objectives • Regional Factors
– Incorporate regional factors into land use loading targets or mitigate their negative impacts
• Use WQ Calibration Data to Inform PQUAL Parameters
• Improve River Calibration Load Targets – Establish load targets for Western Shore, Eastern
Shore, and Lower Potomac – Investigate how Chain Bridge phosphorus loads are
related to loads in subwatersheds – Compare load targets with SPARROW
12/11/2013 4
Objectives (cont.)
• Make River Calibration Methodology Sensitive to Flow Regime
• Incorporate Local Information into Model Calibration Targets
– Local monitoring data
– Results of finer scale simulation models
– MS4 monitoring data
– Soil tests
12/11/2013 5
Using Water Quality Calibration Data to Help Set PQUAL Parameters
Ross Mandel
Interstate Commission on the Potomac Rive Basin
December 11, 2013
This work is a still exploratory. It presents a “PROOF OF CONCEPT” that
1. An analysis of water quality data can help set PQUAL parameters
2. This use of water quality data can take over the at least some of the roles of Regional Factors in the Phase 6 Watershed Model
7 12/11/2013
TOPICS
• Brief Review of How Targets and Regional Factors are set
• PQUAL parameters
• Analysis of Water Quality Calibration Data
• Linking analysis of water quality data to land segments
• How to use WQ analysis to help set PQUAL parameters
8 12/11/2013
Land Segment Targets and Regional Factors
• Land Segment Nutrient Targets – TN and TP targets based on literature review,
nutrient inputs
– Split into separate targets for baseflow, surface flow
• Regional Factors – Multiplicative factors applied to land segment
loads to calculate edge-of-stream loads
– Set in WQ calibration to improve agreement between model and ESTIMATOR loads/key WQ stations
9 12/11/2013
10 12/11/2013
11
G. Shenk 7/23/13
12/11/2013
PQUAL MODULE
• Parameters of PQUAL are concentrations associated with baseflow, interflow, surface runoff, and eroded sediment
• Parameters can be set on a monthly (seasonal) basis
• How can we set PQUAL parameters? – Targets for basflow loads
– Simulated flow (baseflow, etc.) from PWATER
– Concentration parameter = target/ simulated flow
12 12/11/2013
Using Observed Concentrations to Set PQUAL Parameters
• Simple paradigm: Suppose you are using HSPF with PQUAL to simulate
– Small watershed
– Single land use
– Single river reach
– Monitoring station at watershed outlet
• Set PQUAL baseflow concentration parameter = average observed concentration in baseflow
13 12/11/2013
Challenges to Using Observed Data to Inform PQUAL Parameters in Watershed
Model • Multiple land uses
• Nested watersheds in river network
• Not a one-to-relation between land segments and monitoring stations: multiple land segments contribute/impact multiple monitoring locations
14 12/11/2013
Analysis of Water Quality Calibration Data
Constituents TN, TP, NO3, PO4
Seasons • Spring (Mar-May) • Summer (Jun-Aug) • Fall (Sep-Nov) • Winter (Dec-Feb)
Flow Regime (percentile) • Very low (<10%) • Low (10-50%) • High (50-90%) • Very High (>90%) • Ambient (10-90%)
WQ Statistics average, maximum, 10th, 25th, 50th, 75th, and 90th percentiles
15 12/11/2013
Flow Percentiles and Flow Regime
16 12/11/2013
Flow Regime and WQ Concentration
17 12/11/2013
Seasonality of WQ Concentrations
18 12/11/2013
WQ Concentrations by Flow Regime and Season
19 12/11/2013
Geographic Analysis
• Graph bar plot of seasonal mean concentrations on map by major/minor basin
• Look for patterns of seasonal rankings, changes in concentration with watershed size
• Ambient (10-90% flow percentile) and Storm (>90th flow percentile)
• (Statistics are highly correlated, so just looked at mean)
20 12/11/2013
Ambient Mean TP Upper Potomac
GARRETT
HARDY
SOMERSET
HAMPSHIRE
LOUDOUN
FRANKLINFULTON
GRANT
FAUQUIER
FREDERICK
FAIRFAX
WASHINGTON
BERKELEY
FREDERICK
HARDYGRANT
MORGAN
BEDFORD
SHENANDOAH
ALLEGANY
CLARKE
FREDERICK
MINERAL
TUCKER
BEDFORD
JEFFERSON
ADAMS
PAGE
PENDLETON
ALLEGANY
PENDLETON
FRANKLIN
MINERAL
MONTGOMERY
ADAMS
WARREN
PRINCE WILLIAM
ROCKINGHAM
WARREN
BEDFORD
PAGERAPPAHANNOCK
Randolph
CUMBERLAND
SHENANDOAH
PRESTON
RAPPAHANNOCK
FAUQUIER
ROCKINGHAM
CARROLL
CULPEPER
MANASSAS
WINCHESTER
FAIRFAX CITY
MANASSAS PARK
FAIRFAX
FAIRFAX
PU2_3090_4050PU6_3752_4080
PU3_3290_3390
PU6_3610_3530
PU3_3860_3610
PU6_4020_3870
PU4_4310_4210
PU2_5190_4310
PU2_6050_5190
PU2_4360_4160
PU4_3890_3990
PU3_3680_3890
PU4_4440_0003
PU1_4840_4760
Ambient TP
WQ Calibration Stations
0.064
spring
Summer
Fall
Winter
21 12/11/2013 DRAFT
Ambient Mean TP Shenandoah
HAMPSHIRE
HARDY
LOUDOUN
FAUQUIER
FREDERICK
BERKELEY
PAGE
SHENANDOAH
HARDY CLARKE
MINERAL
MORGAN
JEFFERSON
FREDERICK
PRINCE WILLIAM
FAIRFAX
WARREN
WASHINGTON
FREDERICK
SHENANDOAH
ROCKINGHAM
PAGE
WARREN
RAPPAHANNOCK
MINERAL
ALLEGANY
ALLEGANY
MONTGOMERY
ROCKINGHAM
RAPPAHANNOCK
CULPEPER
FAUQUIER
GRANT
GARRETT
MANASSAS
MADISON
WINCHESTER
MANASSAS PARK
PS5_4380_4370
PS1_4790_4830
PS3_5100_5080
PS2_5560_5100
PS2_5550_5560
PS5_5240_5200
PS4_5840_5240
Ambient TP
WQ Calibration Stations
0.064
spring
Summer
Fall
Winter
22 12/11/2013 DRAFT
Ambient Mean TP Middle Potomac
YORK
LOUDOUN
CARROLL
ADAMS
BALTIMORE
FREDERICK
MONTGOMERY
WASHINGTON
FRANKLIN
BERKELEY
HOWARDFREDERICK
FULTON
CLARKE
FREDERICK
FAIRFAX
MORGAN
JEFFERSON
ANNE ARUNDEL
FAUQUIER
WARREN
FRANKLIN ADAMS
PRINCE GEORGES
BALTIMORE
WARREN
FAUQUIER
BEDFORD
DIST OF COLUMBIA
HARFORD
PRINCE WILLIAM ARLINGTON
BALTIMORE
WINCHESTER
DIST OF COLUMBIA
ALLEGANY
ANNE ARUNDEL
FALLS CHURCHANNE ARUNDEL
ANNE ARUNDEL
BALTIMORE
FAIRFAX
ARLINGTON
ANNE ARUNDEL
MONTGOMERY
ANNE ARUNDEL
DIST OF COLUMBIA DIST OF COLUMBIA
ALLEGANY
PM7_4820_0001
PM7_4820_0001
PM1_4250_4500
PM3_4670_4660
PM4_4040_0003
PM1_3120_3400
PM2_2860_3040
PM7_4200_0003PM1_4430_4200
PM1_3510_4000
Ambient TP
WQ Calibration Stations
0.064
spring
Summer
Fall
Winter
23 12/11/2013 DRAFT
Storm Mean TP Upper Potomac
GARRETT
HAMPSHIRE
HARDY
SOMERSET
LOUDOUN
GRANT
FULTON
FREDERICK
WASHINGTON
BERKELEY
FRANKLIN
GRANT HARDY
MORGAN
ALLEGANY
CLARKE
BEDFORD
MINERAL
JEFFERSON
BEDFORD
ALLEGANY
MINERAL
FAUQUIER
FRANKLIN
WARREN
TUCKER
SHENANDOAH
SHENANDOAH
FREDERICK
BEDFORD
WARRENPENDLETON
FAUQUIERPENDLETON PRINCE WILLIAM
Randolph
WINCHESTER
PRESTON
ROCKINGHAM FAIRFAX
PU2_4050_4180PU6_4080_4180
PU3_3290_3390
PU6_3530_3440
PU3_3860_3610
PU6_3870_3690
PU4_4210_4170
PU2_5190_4310
PU2_4160_3930
PU4_3990_3780
PU3_3680_3890
PU4_4440_3970
PU1_4760_4450
Storm TP
WQ Calibration Stations
0.064
spring
Summer
Fall
Winter
24 12/11/2013 DRAFT
Link WQ Calibration Stations to Land Segments through Importance
• Watershed Model already has a method for linking land segments to calibration stations in hydrology calibration: Importance
• Importance – What fraction of calibration station’s watershed is
contributed by land segment – Measures influence of land segment on station
• Calculate concentration for each land segment as average of seasonal station concentrations weighed by importance
25 12/11/2013
26 12/11/2013
YORK
Randolph
SOMERSET
Greenbrier
INDIANA
BLAIR
Pocahontas
PERRY
CAMBRIA
GARRETTPRESTON
HUNTINGDON
LANCASTER
LOUISA
FAUQUIER
BATH
AUGUSTA
FULTON
HARDY
HAMPSHIRE
ADAMS
MIFFLIN
BALTIMORE
LOUDOUN
CENTRE
TUCKER
FAIRFAX
JUNIATA
CHARLES
CAROLINE
FRANKLIN
CARROLL
ALBEMARLE
BATH
HARFORD
SCHUYLKILL
DAUPHIN
GRANT
SNYDER
ORANGE
LEBANON
FREDERICK
FREDERICK
CULPEPER
PAGE
MONTGOMERY
WASHINGTON
BERKELEY
CUMBERLAND
HOWARD
SPOTSYLVANIA
MORGAN
ALLEGANY
BERKS
MADISON
CLARKE
CLEARFIELD
ROCKBRIDGE
DAUPHIN
ALLEGHANYFLUVANNA
BEDFORD
AUGUSTA
ROCKINGHAM
ST MARYS
FRANKLINBEDFORD
BEDFORD
PENDLETON
HARDYGRANT
PENDLETON
ST MARYS
ANNE ARUNDEL
PRINCE GEORGES
TALBOT
STAFFORD
DORCHESTER
HIGHLAND
SHENANDOAH
ESSEX
CALVERT
KENT
PAGEROCKINGHAM
FREDERICK
PRINCE WILLIAM
MINERAL
KENT
ADAMS
JEFFERSON
NORTHUMBERLAND
ALLEGANY
MINERAL
HIGHLAND
CALVERT
WARREN
WESTMORELAND
CENTRE
RICHMOND
KING GEORGE
QUEEN ANNES
MADISON
SHENANDOAH
TALBOT
NELSON
ANNE ARUNDEL
AUGUSTA
RAPPAHANNOCK
WARREN
GREENE
CUMBERLAND
NELSON
CHARLES
COLUMBIAUNION
GREENE
HANOVER
ALBEMARLE
SOMERSET
BALTIMORE
UNION
WESTMORELAND
BALTIMORE
CECIL
HARFORD
RAPPAHANNOCK
ROCKINGHAM
NORTHUMBERLAND
FAUQUIER
NORTHUMBERLAND
TALBOT
KING GEORGE
KING AND QUEEN
ESSEX
DIST OF COLUMBIAARLINGTON
STAFFORD
QUEEN ANNES
ROCKBRIDGE
STAUNTON
FAIRFAX
ALEXANDRIA
HARRISONBURG
FAIRFAX
RICHMOND
WAYNESBORO
BALTIMORE
MANASSAS
DORCHESTER
PRINCE WILLIAM
WINCHESTER
FREDERICKSBURG
CHARLOTTESVILLE
FAIRFAX CITY
QUEEN ANNES
PRINCE GEORGES
CAROLINEKING GEORGE
PRINCE GEORGES
MANASSAS PARK
CHESTER
FAIRFAX
Mean Ambient TP (mg/l)
Land Segments
Fall
0.01 - 0.04
0.05 - 0.08
0.09 - 0.12
0.13 - 0.16
0.17 - 0.28
Fall Weighted Baseflow TP Concentration
27 12/11/2013 DRAFT
YORK
Randolph
SOMERSET
Greenbrier
INDIANA
BLAIR
Pocahontas
PERRY
CAMBRIA
GARRETTPRESTON
HUNTINGDON
LANCASTER
LOUISA
FAUQUIER
BATH
AUGUSTA
FULTON
HARDY
HAMPSHIRE
ADAMS
MIFFLIN
BALTIMORE
LOUDOUN
CENTRE
TUCKER
FAIRFAX
JUNIATA
CHARLES
CAROLINE
FRANKLIN
CARROLL
ALBEMARLE
BATH
HARFORD
SCHUYLKILL
DAUPHIN
GRANT
SNYDER
ORANGE
LEBANON
FREDERICK
FREDERICK
CULPEPER
PAGE
MONTGOMERY
WASHINGTON
BERKELEY
CUMBERLAND
HOWARD
SPOTSYLVANIA
MORGAN
ALLEGANY
BERKS
MADISON
CLARKE
CLEARFIELD
ROCKBRIDGE
DAUPHIN
ALLEGHANYFLUVANNA
BEDFORD
AUGUSTA
ROCKINGHAM
ST MARYS
FRANKLINBEDFORD
BEDFORD
PENDLETON
HARDYGRANT
PENDLETON
ST MARYS
ANNE ARUNDEL
PRINCE GEORGES
TALBOT
STAFFORD
DORCHESTER
HIGHLAND
SHENANDOAH
ESSEX
CALVERT
KENT
PAGEROCKINGHAM
FREDERICK
PRINCE WILLIAM
MINERAL
KENT
ADAMS
JEFFERSON
NORTHUMBERLAND
ALLEGANY
MINERAL
HIGHLAND
CALVERT
WARREN
WESTMORELAND
CENTRE
RICHMOND
KING GEORGE
QUEEN ANNES
MADISON
SHENANDOAH
TALBOT
NELSON
ANNE ARUNDEL
AUGUSTA
RAPPAHANNOCK
WARREN
GREENE
CUMBERLAND
NELSON
CHARLES
COLUMBIAUNION
GREENE
HANOVER
ALBEMARLE
SOMERSET
BALTIMORE
UNION
WESTMORELAND
BALTIMORE
CECIL
HARFORD
RAPPAHANNOCK
ROCKINGHAM
NORTHUMBERLAND
FAUQUIER
NORTHUMBERLAND
TALBOT
KING GEORGE
KING AND QUEEN
ESSEX
DIST OF COLUMBIAARLINGTON
STAFFORD
QUEEN ANNES
ROCKBRIDGE
STAUNTON
FAIRFAX
ALEXANDRIA
HARRISONBURG
FAIRFAX
RICHMOND
WAYNESBORO
BALTIMORE
MANASSAS
DORCHESTER
PRINCE WILLIAM
WINCHESTER
FREDERICKSBURG
CHARLOTTESVILLE
FAIRFAX CITY
QUEEN ANNES
PRINCE GEORGES
CAROLINEKING GEORGE
PRINCE GEORGES
MANASSAS PARK
CHESTER
FAIRFAX
Mean Ambient TP (mg/l)
Land Segments
Winter
0.03 - 0.04
0.05 - 0.08
0.09 - 0.12
0.13 - 0.16
0.17 - 0.25
Winter Weighted Baseflow TP Concentration
28 12/11/2013 DRAFT
YORK
Randolph
SOMERSET
Greenbrier
INDIANA
BLAIR
Pocahontas
PERRY
CAMBRIA
GARRETTPRESTON
HUNTINGDON
LANCASTER
LOUISA
FAUQUIER
BATH
AUGUSTA
FULTON
HARDY
HAMPSHIRE
ADAMS
MIFFLIN
BALTIMORE
LOUDOUN
CENTRE
TUCKER
FAIRFAX
JUNIATA
CHARLES
CAROLINE
FRANKLIN
CARROLL
ALBEMARLE
BATH
HARFORD
SCHUYLKILL
DAUPHIN
GRANT
SNYDER
ORANGE
LEBANON
FREDERICK
FREDERICK
CULPEPER
PAGE
MONTGOMERY
WASHINGTON
BERKELEY
CUMBERLAND
HOWARD
SPOTSYLVANIA
MORGAN
ALLEGANY
BERKS
MADISON
CLARKE
CLEARFIELD
ROCKBRIDGE
DAUPHIN
ALLEGHANYFLUVANNA
BEDFORD
AUGUSTA
ROCKINGHAM
ST MARYS
FRANKLINBEDFORD
BEDFORD
PENDLETON
HARDYGRANT
PENDLETON
ST MARYS
ANNE ARUNDEL
PRINCE GEORGES
TALBOT
STAFFORD
DORCHESTER
HIGHLAND
SHENANDOAH
ESSEX
CALVERT
KENT
PAGEROCKINGHAM
FREDERICK
PRINCE WILLIAM
MINERAL
KENT
ADAMS
JEFFERSON
NORTHUMBERLAND
ALLEGANY
MINERAL
HIGHLAND
CALVERT
WARREN
WESTMORELAND
CENTRE
RICHMOND
KING GEORGE
QUEEN ANNES
MADISON
SHENANDOAH
TALBOT
NELSON
ANNE ARUNDEL
AUGUSTA
RAPPAHANNOCK
WARREN
GREENE
CUMBERLAND
NELSON
CHARLES
COLUMBIAUNION
GREENE
HANOVER
ALBEMARLE
SOMERSET
BALTIMORE
UNION
WESTMORELAND
BALTIMORE
CECIL
HARFORD
RAPPAHANNOCK
ROCKINGHAM
NORTHUMBERLAND
FAUQUIER
NORTHUMBERLAND
TALBOT
KING GEORGE
KING AND QUEEN
ESSEX
DIST OF COLUMBIAARLINGTON
STAFFORD
QUEEN ANNES
ROCKBRIDGE
STAUNTON
FAIRFAX
ALEXANDRIA
HARRISONBURG
FAIRFAX
RICHMOND
WAYNESBORO
BALTIMORE
MANASSAS
DORCHESTER
PRINCE WILLIAM
WINCHESTER
FREDERICKSBURG
CHARLOTTESVILLE
FAIRFAX CITY
QUEEN ANNES
PRINCE GEORGES
CAROLINEKING GEORGE
PRINCE GEORGES
MANASSAS PARK
CHESTER
FAIRFAX
Mean Ambient TP (mg/l)
Land Segments
Spring
0.01 - 0.03
0.04 - 0.06
0.07 - 0.09
0.10 - 0.12
0.13 - 0.18
Spring Weighted Baseflow TP Concentration
29 12/11/2013 DRAFT
YORK
Randolph
SOMERSET
Greenbrier
INDIANA
BLAIR
Pocahontas
PERRY
CAMBRIA
GARRETTPRESTON
HUNTINGDON
LANCASTER
LOUISA
FAUQUIER
BATH
AUGUSTA
FULTON
HARDY
HAMPSHIRE
ADAMS
MIFFLIN
BALTIMORE
LOUDOUN
CENTRE
TUCKER
FAIRFAX
JUNIATA
CHARLES
CAROLINE
FRANKLIN
CARROLL
ALBEMARLE
BATH
HARFORD
SCHUYLKILL
DAUPHIN
GRANT
SNYDER
ORANGE
LEBANON
FREDERICK
FREDERICK
CULPEPER
PAGE
MONTGOMERY
WASHINGTON
BERKELEY
CUMBERLAND
HOWARD
SPOTSYLVANIA
MORGAN
ALLEGANY
BERKS
MADISON
CLARKE
CLEARFIELD
ROCKBRIDGE
DAUPHIN
ALLEGHANYFLUVANNA
BEDFORD
AUGUSTA
ROCKINGHAM
ST MARYS
FRANKLINBEDFORD
BEDFORD
PENDLETON
HARDYGRANT
PENDLETON
ST MARYS
ANNE ARUNDEL
PRINCE GEORGES
TALBOT
STAFFORD
DORCHESTER
HIGHLAND
SHENANDOAH
ESSEX
CALVERT
KENT
PAGEROCKINGHAM
FREDERICK
PRINCE WILLIAM
MINERAL
KENT
ADAMS
JEFFERSON
NORTHUMBERLAND
ALLEGANY
MINERAL
HIGHLAND
CALVERT
WARREN
WESTMORELAND
CENTRE
RICHMOND
KING GEORGE
QUEEN ANNES
MADISON
SHENANDOAH
TALBOT
NELSON
ANNE ARUNDEL
AUGUSTA
RAPPAHANNOCK
WARREN
GREENE
CUMBERLAND
NELSON
CHARLES
COLUMBIAUNION
GREENE
HANOVER
ALBEMARLE
SOMERSET
BALTIMORE
UNION
WESTMORELAND
BALTIMORE
CECIL
HARFORD
RAPPAHANNOCK
ROCKINGHAM
NORTHUMBERLAND
FAUQUIER
NORTHUMBERLAND
TALBOT
KING GEORGE
KING AND QUEEN
ESSEX
DIST OF COLUMBIAARLINGTON
STAFFORD
QUEEN ANNES
ROCKBRIDGE
STAUNTON
FAIRFAX
ALEXANDRIA
HARRISONBURG
FAIRFAX
RICHMOND
WAYNESBORO
BALTIMORE
MANASSAS
DORCHESTER
PRINCE WILLIAM
WINCHESTER
FREDERICKSBURG
CHARLOTTESVILLE
FAIRFAX CITY
QUEEN ANNES
PRINCE GEORGES
CAROLINEKING GEORGE
PRINCE GEORGES
MANASSAS PARK
CHESTER
FAIRFAX
Mean Ambient TP (mg/l)
Land Segments
Summer
0.03 - 0.04
0.05 - 0.08
0.09 - 0.12
0.13 - 0.18
0.19 - 0.25
Summer Weighted Baseflow TP Concentration
30 12/11/2013 DRAFT
Using Weighted Concentrations to Modify LU PQUAL Parameters
• Weighted Seasonal Concentration *Baseflow = Contribution of Land Segment to baseflow load (on seasonal basis)
• Modify initial PQUAL baseflow concentration parameters so anticipated baseflow load matches load based on weighted seasonal concentrations
• Assume same correction factor for each land use
31 12/11/2013
C = observed (seasonal) baseflow concentration (as weighted by station importance) Coi = original baseflow concentration parameter for LUi Cri = revised baseflow concentration parameter for LUi Ai = area of LUi Bi =baseflow volume from LUi a = Correction factor
Basic Assumption: C ∗ Ai ∗ Bi = a ∗ Coi ∗ Ai ∗ Bi
Solving for a: 𝑎 = 𝐶 ∗
𝐴𝑖 ∗ 𝐵𝑖 𝐶𝑜𝑖 ∗ 𝐴𝑖 ∗ 𝐵𝑖
Assume Bi ‘s same, to simplify: 𝑎 = 𝐶 ∗
𝐴𝑖 𝐶𝑜𝑖 ∗ 𝐴𝑖
32 12/11/2013
(Test) Adjustment Factor for PO4
33
SOMERSET
PERRY
GARRETTPRESTON
FAUQUIER
AUGUSTA
FULTON
HARDY
HAMPSHIRE
ADAMS
LOUDOUN
TUCKER
FAIRFAX
FRANKLIN
CARROLL
GRANTFREDERICK
FREDERICK
PAGE
MONTGOMERY
WASHINGTON
BERKELEY
MORGAN
ALLEGANY
CLARKE
BEDFORD
AUGUSTA
ROCKINGHAM
FRANKLINBEDFORD
BEDFORD
PENDLETON
HARDYGRANT
PENDLETON
HIGHLAND
SHENANDOAH
PAGEROCKINGHAM
FREDERICKMINERAL
ADAMS
JEFFERSON
ALLEGANY
MINERAL
HIGHLAND
WARRENSHENANDOAH
AUGUSTA
WARREN
CUMBERLAND
ROCKINGHAM
FAUQUIER DIST OF COLUMBIA
STAUNTON
FAIRFAX
HARRISONBURG
FAIRFAX
WAYNESBORO
DIST OF COLUMBIA
WINCHESTER
DIST OF COLUMBIA
FAIRFAX
Baseflow PO4 Adjustment Factor
Land Segments
SumOfcombo
0.0038 - 0.063
0.063 - 0.178
0.178- 0.372
0.372 - 0.726
0.726 - 1.69
12/11/2013 DRAFT:Based on P52
P532 TP Regional Factors
Regional Factors
River Segments
TP
0.731
1.392
1.392 - 1.44
1.44- 1.463
1.463 - 1.659
34 12/11/2013
Advantages over Regional Factors
• Targeted use of WQ data to modify land segment loads
• Modifications can be applied to land simulation targets outside of river calibration
35 12/11/2013
Issues
• Which statistics to use
• Alternative methods of weighing land uses
• Can method be applied to other PQUAL parameters (interflow)
• Take into account point source influence
• ???
36 12/11/2013