WSP11064

• File Number: 8282.500
• Description: Colorado River Operations
• Basin: Colorado Mainstem
• Date: 10/30/1969
• Author: USDOI/BOR
• Title: Report of the Committee on Probabilities and Test Studies to the Task Force on Operating Criteria for the Colorado River
• Water Supply Pro - Doc Type: Publication

Firm Energy Generation at Hoover.Powerplant

A comparison of studies similar except for power production at Lake Mead

is shown on Table 8. Study 29R shows the results of generating firm

energy at Hoover from 1970 through 1987 and is compared to the base

study 32.

Se~uences Containing the Lowest Streamflows during the early years

Although the 1931-1961 sequence' is the lowest in terms ,of total runoff

for the entire period of all the possible sequences, the 1953-1920

sequence contains less total runoff in the early years. Since this

might indicate a problem in maintaining power production at Glen Canyon

during the next few years, we ran one study to check this possibility.

Lake Powell was drawn to elevation 3492' one time in 1974 with this

sequence.

Studies to Reflect Depletion Conditions after Year 2000

At the request of Mr. HOlburt, we ran four studies with four streamf~ow

sequences each for the year 2001 to 2031 period to demonstrate the effect

of the criteria after year 2000. One of these studies (Number 34) using

sequence 8 indicated an Upper Basin shortage of 426,000 acre-feet in the

twenty-sixth year of the study. This was the only Upper Basin shartage

imposed by the criteria found in all of the 146 studies that were made.

Withdrawals or Water from below Elevation 1083' at Hoover

Withdrawals of water below'elevation 1083' at Hoover occur in 159 years

in twenty-five study sequences from a total number of 4526 study years
or 3.5% of the time. These withdrawals occurred three times using

sequence 3, 11 times using sequence 6, two times using sequence 7, 8 times

in sequence 8, one time in sequence 9, and no time in sequence 12.

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