BOARD01350

• Board Meeting Date: 1/24/2006
• Description: WSP Section - Colorado River Issues - Development of Opearations for Lakes Powell and Mead under Low Reservoir Conditions, including the Development of Lower Basin Shortage Criteria
• Board Meetings - Doc Type: Memo

Modeling of Reservoir Management Strategies
for Lakes Powell and Mead

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4.3.1

Lake Powell and Lake Mead Percentile Elevations
FigUT(, -l-16
Lak(' Pow('lI IOrh and SO'h f'('Tcentil(' Ele,,'alion..

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SO"'Pereentiles

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~ 3.600
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1 3,560
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10"'Pereenliles

3.540 -

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. Figure 4-]6 shows the 10th and 50'h percentile elevations at Lake Powell. At the loth perccntile Hybrid
rcv2 is abovc all strategies for every year after 2009. Hybrid red. which includes an extended 7.48 band
and increased Lake Mead balancing elevation also Slays above the Nonnal for almost the entire nm
duration. At the 50th percentile. lIybrid Original and Hybrid rev2. both having a Lake i\-leaJ balancing
elevation of 1050 ft arc nearly the same. both approaching the Nonnal50'h percentile in 2025.

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30

Working Drall. Version 2.1anuary. 2006