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I I I I I I I I I I I I I I I I I I I ,~ j .~ G .'j 2.. 000297 determined once an storage-area-elevation relation is developed. A storage-area-elevation curve for Little Snake Reservoir will need to be developed from mapping obtained from CRWCD. WIRSOS uses this information to calculate reservoir evaporation losses. Project demands to be modeled include direct flow bypasses and storage releases through the Powder Wash Power Plant for hydroelectric power generation. Flows in the Little Snake River are erratic and vary from year to year. Under actual operations, flows through the turbines would also vary. However, WIRSOS is not capable of modeling demands that change from year to year. Therefore, the system will be modeled, to the extent that WIRSOS will permit, such that Little Snake Reservoir fills as of June 1 followed by a constant discharge through the turbines such that the reservoir is at minimum storage as of April 1 of the following year. The conditional water right amount for the Powder Wash Power Plant provides for 800 cfs to be supplied by the Little Snake River and Little Snake Reservoir storage releases. If a constant demand of 800 cfs were assumed, the full demand could be met only part of the time during the 1930-82 period. Under the Water Development Baseline, estimated flows of the Little Snake River at the Little Snake Reservoir average only 430 cfs per month, almost half of the Powder Wash Power Plant right (800 cfs), To determine a realistic constant power plant demand that can be met every year in the study period, it will be necessary to perform a firm yield study with WIRSOS. An initial constant demand of 225 cfs will be used in the firm yield investigation. An average monthly discharge of 225 cfs for the entire year would be sufficient to release the total active 29