7748

• UCREFRP Catalog Number: 7748
• Author: Western Water Consultants, I.
• Title: Final Report on Little Snake River Depletions by Pot Hook, Three Fork and Powder Wash Rights.
• USFW Year: 1990.
• USFW - Doc Type: Laramie, WY.
• Copyright Material: NO

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Powder Wash Project are discussed in Section 3.2.2 of this report.
As with Scenario No. 3, a firm yield study of Little Snake Reservoir was performed.
The final WIRSOS run was made with a constant power release demand of 160 c.f.s. This
was found to be the highest demand that could be met 100 percent of the time, therefore,
the results of this run were used to determine the impact of the Powder Wash Project
upon the flows at Lily, Colorado.
The Scenario No. 5 flows at Lily are presented in Table D.17. The average annual
flow at Lily for Scenario No. 5 was calculated to be 296,722 acre-feet. A comparison
between Scenario No. 5 flows and the Water Development Baseline flows is presented in
Table D.18. Average annual flows at Lily for Scenario No. 5 are 9,446 acre-feet lower
than the Water Development Baseline flows. Hydrographs comparing the flows at Lily
under Scenario No. 5 are shown on Figure D-31 through D-35.
4.6 SUMMARY OF RESULTS
A summary of the WIRSOS modeling results is presented in Table 6. Because the
effects of the projects will be monthly, hydrographs are presented. Each Scenario is
compared on five hydrographs. The first depicts the variation during the average of three
dry years, 1931, 1955 and 1961. The second for the average of the three average years,
1941, 1951 and 1956. The third for the average of three wet years, 1932, 1962 and 1979.
Hydrographs for the driest year (1977) and wettest year (1952) are also presented.
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