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, I ,..,,~ --~,,~."*,.-,-...,- -.....,...,.~ - "'--'--~-'-~",",_.""- . . MEMORANDUM COLORADO WATER CONSERVATION BOARD 1. William McDonald Director ~ December 12, 1980 TO: J. William MCDonald, Director Stephen O. Ellis, A-95 Clearing House FROM: Fred E. Daubert i~tJ Barbe Chambliss ~ SUBJECT: Environmental Assessment - Dallas Creek Project Addition of Hydroelectric Power GeneratJ.on, WPRS November, 1980. ---------------------------------------------------------------------- The Dallas Creek project is located on the Uncompahgre River about halfway between Ouray and Montrose. The project includes Ridgway Dam and Reservoir which has a capacity of 80,000 acre-feet. The objective of this power study on the Dallas Creek Project was to develop the most efficient plan to produce the maximum amount of energy with the water available without significantly interfering with its original purpose. All the water for this power study is discretionary water (spills, minimum releases) which is secondary to the Dallas Creek Project water demand. Alternative Summary No. 1 - This alternative follows the same plan that was presented in the definite plan report and does not include any power development. No. 2 - This alternative would include a single 1.8 MW unit operating year-round on a base-load assignment. It would produce 12,530 MWh annually and the reservoir spills would be reduced from 15 to 11 years during the 19-year study period. The average spill would decrease from 45,100 A-F to 34,200 A-F. The outlet works would require some redesign to accomodate a single unit. It would require an average head of 170 feet and would discharge 150 cubic feet of water per second. No. 3 - This alternative would operate 60 base-load basis. includes two 1,8 MW units that percent of the time on a It would produce 17,760 MWh