CRFS Technical MeetingUC Operations Update

March 30, 2010

Topics

• Fontenelle and Flaming Gorge Operations• Aspinall Operations• Powell Operations

Green River Basin – Fontenelle and Flaming Gorge

Fontenelle Reservoir Elevation

6460.00

6465.00

6470.00

6475.00

6480.00

6485.00

6490.00

6495.00

6500.00

6505.00

6510.00M

ar-0

9

Apr

-09

May

-09

Jun-

09

Jul-0

9

Aug

-09

Sep

-09

Oct-

09

Nov

-09

Dec

-09

Jan-

10

Feb-

10

Mar

-10

Apr

-10

May

-10

Jun-

10

Jul-1

0

Aug

-10

Sep

-10

Oct-

10

Nov

-10

Dec

-10

Jan-

11

Feb-

11

Mar

-11

Apr

-11

Elev

atio

n (ft

)

Month

Fontenelle Operations WY2010Most Probable Operations (Mar 15 forecast)

Historic Max Elevation Min Elevation Projected Spring Target

0500

100015002000250030003500400045005000550060006500700075008000850090009500

10000M

ar-0

9

Apr

-09

May

-09

Jun-

09

Jul-0

9

Aug

-09

Sep

-09

Oct-

09

Nov

-09

Dec

-09

Jan-

10

Feb-

10

Mar

-10

Apr

-10

May

-10

Jun-

10

Jul-1

0

Aug

-10

Sep

-10

Oct-

10

Nov

-10

Dec

-10

Jan-

11

Feb-

11

Mar

-11

Flow

(cfs

)

Month

Fontenelle Operations 2010Most Probable Operations (March 15 forecast)

Inf low (5-day avg) Projected Inf low Release Projected Release

Fontenelle Inflow and Release

Apr – Jul Inflow415 KAF (48%)

Projected Release 800 cfs steady

(no peak)

CRFS Green River Basin April 2010

Live Capacity 3.752 MAFCapacity on 3/28/10 3.194 MAFAvailable Space .558 MAFPercentage of Full 80 %

Reservoir Elev. (Min Power) 5908.00 feetElevation on 3/28/10 6025.91 feetElevation above (Min) 117.91 feet

Average Inflow 1,240 cfsAverage Release 810 cfs

CRFS Green River Basin

CRFS Green River Basin

CRFS Green River Basin

515 KAF = 43% Average

245 KAF = 21% Average

1,251 KAF = 75% Average

CRFS Green River Basin

960 KAF = 70% Average

610 KAF = 45% Average

1,385 KAF = 101% Average

CRFS Green River Basin

1,475 KAF = 58% Average

855 KAF = 34% Average

2,275 KAF = 89% Average

CRFS Green River Basin

CRFS Green River Basin

CRFS Green River Basin

Gunnison River Basin – Aspinall

4,035 cfs

Mar 15 Forecast570 KAF

UC Mainstem – Glen Canyon Dam

Review of Operational CriteriaInterim Guidelines for Coordinated Operation of

Lake Powell and Lake Mead

Lake Powell Equalization

Table

Water Year Lake Powell Elevation (feet)

2008 3,636

2009 3,639

2010 3,642

2011 3,643

2012 3,645

2013 3,646

2014 3,648

2015 3,649

2016 3,651

2017 3,652

2018 3,654

2019 3,655

2020 3,657

2021 3,659

2022 3,660

2023 3,662

2024 3,663

2025 3,664

2026 3,666

Lake Powell & Lake Mead Operational Diagrams for 2010

1 Subject to April adjustments that may result in balancing releases or releases according to the Equalization Tier.2 These are amounts of shortage (i.e., reduced deliveries in the United States).3 If Lake Mead falls below elevation 1,025 ft, the Department will initiate efforts to develop additional guidelines for shortages at lower Lake Mead elevations.

11.41/1/10

Projection

3,6351/1/10

Projection

15.41/1/010Proj

ection1,0981/1/10

Projection

Projected Operation for Remainder of WY2010

24-Month Study

ProjectedPowell

WY Unreg Inflow

ProjectedPowell Apr- Jul Unreg Inflow

ProjectedLake Powell

EOWY Elevation

w/ 8.23 maf Release

Projected Glen

Canyon WY

Release

Projected Amount of EQ

Release

ProjectedLake Mead EOWY

Elevation

Probability of EQ

Aug2009

91%11.0 maf

91%7.25 maf 3656.44 ft 10.49 maf 2.26 maf 1105.0 ft 70%

Oct2009

83%10.0 maf

82%6.55 maf 3644.74 ft 10.59 maf 2.36 maf 1105.0 ft 55%

Nov2009

82%9.9 maf

82%6.55 maf 3644.33 ft 10.67 maf 2.44 maf 1105.0 ft 50%

Dec2009

82%9.9 maf

82%6.55 maf 3643.18 ft 10.77 maf 2.54 maf 1105.0 ft 36%

Jan2010

77%9.3 maf

78%6.2 maf 3638.31 ft 8.23 maf 0.00 maf 1077.02 21%

Summary of Lake Powell and Lake Mead Operations24-Month Study 2010 Water Year Projections

In 2010, the Equalization Elevation is 3642 ft.

24-Month Study

ProjectedPowell

WY Unreg Inflow

ProjectedPowell Apr- Jul Unreg Inflow

ProjectedLake Powell

EOWY Elevation

w/ 8.23 maf Release

Projected Glen

Canyon WY

Release

Projected Amount of EQ

Release

ProjectedLake Mead EOWY

Elevation

Probability of EQ

Jan2010

77%9.3 maf

78%6.2 maf 3638.31 ft 8.23 maf 0.00 maf 1077.02 ft 21%

Feb 2010

73% 8.9 maf

73% 5.8 maf 3634.80 ft 8.23 maf 0.00 maf 1081.17 ft 25%

Mar 2010

69% 8.3 maf

68%5.4 maf 3631.88 ft 8.23 maf 0.00 maf 1081.36 ft 3%

Apr 2010 ---

Summary of Lake Powell and Lake Mead Operations24-Month Study 2010 Water Year Projections

In 2010, the Equalization Elevation is 3642 ft.