PUB00155

• Year: 2007
• Title: The Colorado River The Story of a Quest for Certainty on a Diminishing River
• CWCB Section: Administration
• Author: Eric Kuhn
• Description: The Colorado River The Story of a Quest for Certainty on a Diminishing River
• Publications - Doc Type: Other

smaller shortages sooner and makes water potentially available to address
environmental issues in the Colorado River Delta.

3. Water Supply Alternative: This alternative would maximize reservoir drawdowns
before any shortages are required. The tradeoff is that if a shortage is necessary, it's
going to be big.

4. Reservoir Storage Alternative: It maximizes keeping water in storage by triggering
more frequent shortages. It primarily benefits recreation and power generation.

Figure V -8 shows the Lake Mead elevation triggers for the Interim Surplus Guidelines (ISGs)
and the Seven States proposed triggers for shortages and coordinated operations of Lakes Mead and
Powell.

Basin States Alternative - Coordinated Operations EIS
Lake Powell

FULL 3700 II MSL

3525 II -

24.3 MAF

602(a) _ _

Equalize or Release 8.23 MAF

Release 8.23 MAF
If Lake Mead < 1075 II MSL,
balance contents wtth a
minimax release of
7.0 and 9.0 MAF

3575 II -

Minimum Power 3490 II _

Lake Mead

FULL 1220 II MSL
1200 II - -

1075 II - ".

Full Domestic Supply

_ ~Io~ C:o~tr~1 .:>~rp~u~ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

25.9 MAF
22.9 MAF

1145 II -"

Normal Operations

1050 II -

Shortage 400 AAF:,. ,
, shortage 500 KAF ,. ,.

1025 11 -

89511 - --

FIGURE V-8: Lake Mead Triggers

Page -63-