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, . . I I I I I I I I I I I I I I I I I I I . OOG~'73. It was the desire of the Study Oversight Panel to allow multiple fills of Pot Hook Reservoir. Since the decreed storage amount exceeds the USBR storage capacity (60,000 acre-feet), the multiple fill operation would allow full utilization of the decreed storage amount providing the water is available. With a one fill operation, 60,000 acre-feet would be the most water that could be stored in any given year. For Scenario No.1, Pot Hook Reservoir was modeled as both a one-fill and a multiple fill reservoir. The resulting Little Snake River flows at Lily, Colorado are presented in Tables 0.2 and 0.3 (see Appendix D). There is less than 1 percent difference between the average annual flow for the one- fill operation (271,486 acre-feet per year) and the multiple fill operation flows (271,042 acre-feet per year). Therefore, the results of the one-fill operation were used to determine the impact of the Pot Hook project upon Lily flows. A comparison between Scenario No.1 flows (at Lily) for the one-fill operation and Water Development Baseline flows is presented in Table 0.4. Based upon this information, the implementation of the Pot Hook Project as modeled would result in an average reduction in the Water Development Baseline annual flow at Lily of 34,682 acre- feet. Scenario No. 1A reduced the Water Development Baseline flow by an average of 34,255 acre-feet while Scenario No. IB reduced the flow by an average of 38,258 acre- feet. These comparisons are shown in Tables 0.6 and 0.8. The annual average values given as comparison show the algebraic sum of the monthly difference. During some months the flow at Lily can be greater or less than the Water Development Baseline. More meaningful comparisons are shown on hydrographs. 38