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�i <br />I <br />agricultural shortages and instream flow deficiencies still remained with the <br />1 reservoirs assumed to be in place. The results also suggested that the <br />� shortages could be eliminated or reduced by moving to storage sites further <br />� upstream on Tomichi and Cochetopa Creeks. Therefore, Scenario 26 evaluated a <br />combination of Castleton, Sargents No. 3, and Pauline reservoirs. <br />J <br />The storage of water in these reservoirs was assumed to occur under <br />conditional decrees held by the Upper Gunnison River Water Conservancy <br />District, assuming they could be transferred to the proposed reservoir site if <br />required. The reservoirs were aperated to alleviate agricultural supply <br />shortages and to meet enhanced instream flow targets. Releases were made on <br />demand to satisfy both water uses. Otherwise the reservoirs were allowed to <br />store water in priority and to spill when full. <br />The enhanced instream flow targets were developed from statistics of <br />natural flow on Ohio, Tomichi, and Cochetopa Creeks and are based on fishery <br />and recreational considerations. On all streams the enhanced instream flow <br />tar9ets are equal to or higher than the CWCB decreed values. Enhanced <br />instream flow targets were developed for each modeled reach on each of the <br />three tributaries. However, usually only one reach on each tributary acted as <br />the controlling reach, calling instream flow water through the other reaches <br />and satisfying them in the process. The controlling reaches and their <br />associated flow targets are: <br />Ohio Ck. at Mouth <br />Tomichi Ck. Above Razor Ck. <br />Cochetopa Ck. Above Los Pinos Ck <br />29 cfs year-round <br />18 cfs Oct-Mar, 31 cfs Apr-Sep <br />9 cfs Oct-Mar, 15 cfs Apr-Sep <br />The hydrologic performance of each in-basin reservoir was evaluated <br />mainly by assessing agricultural shortages and instream flow conditions on the <br />I respective streams. Recreation potential of the reservoirs was evaluated by <br />examining reservoir level fluctuations. Basin-wide effects were identified by <br />evaluating conditions at several other key stream reaches, storage reservoirs, <br />+ and points of diversion in the basin. <br />6-3 <br />