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. PRELIMINARY. -- SUBJECT TO REVISION ~~ losses to derive the net operating head. The modified pool elevation-duration curves are shown on plate 5. ~ Cl r~ 3. In the event that a permanent pool is established which is less than the 10.000 acre-feet maximum limit then the modified pool elevation-duration curves would need to be reevaluated. The Colorado Division of wildlife has estimated that 3000 acre-feet is the approximate minimum pool required to maintain a sport fishery habitat. A review of the pool elevation-capacity\ relationship for the reservoir indicates that there is a difference of less! than five feet of head between a 3000 acre-feet pool and a 10.000 acre-feet i pool. Resulting differences in power generating potential would be of similar) proportions. I " -- to...~.... ',...I~ . .~.:.rv'{(:. , " ". ("ft"', 4. . The modified net operating head for each month was used to calculate the average energy values for each alternative plan. Table 7 lists the average energy potential of the alternative plans assuming a 10.000 acre-feet permanent pool. The impact of this increased energy generation on project economic feasibility is shown below. Benefit/Cost Ratio -As is- With Permanent Pool Alternative I II III IV 1.63 1.79 1.68 1.17 1.92 2.12 1.98 1.30 300 5"'00 "'JX> goO Q ~ Environmental and Cultural Considerations. 1. The U.S. Fish and Wildlife Service Ecological Services Field Office -- for Colorado has been informally contacted and informed of the project. As plans are developed for the project. the appropriate documentation pursuant to the National Environmental Policy Act will be prepared. 2. Coordination with the Endangered Species Section. U.S. Fish and Wildlife Service. Salt Lake City. has revealed that the project lies within 17