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0012~7. BLACK CANYON INFORMATION PAPER Oct. 2000 3. Sufficient water to permit pealcing power generation of 40,000 kilowatts at the Morrow Point powerplant for 217 hours a month. 4. Sufficient water to provide a minimumjIow of 100 second-feet in the Gunnison River through the Black Canyon of the Gunnison National Monument. The stated objective was to prevent uncontroUed spills as much as possible during high runoff and yet assure a full reservoir on July 31, When water was released to make room for floodflows, the power generation used was up to the full capacity. It was assumed that sufficient storage to meet the Gunnison tunnel requirements would be provided from Taylor Park Reservoir and at times of low flow the Curecanti unit would pass through the Taylor Park releases for delivery at the Gunnison tunnel. At page 18 the report states: It is noteworthy that even with the restrictive operating criteria used and the relatively small active reservoir storage capacity, only an average of 47, 000 acre- feet o/water annually spilled at Blue Mesa during the 1971-2014 period, less than 5 percent of the average runoff at the site. The Curecanti unit reservoirs will thus provide essentially complete control of available streamflow for power production during years of average and below average runoff but will not have sufficient storage capacity to completely regulate flows during extended periods of ahove-average nmoff. Sufficient storage capacity will he available to smooth out the flows somewhat during the year hy storing early spring flows for later releases. Operation of the unit will also provide some storage holdover from high runoff years to low years. Under the operating criteria, the minimum summer releases from the Curecanti unit will exceed the present minimum flow in the river. The National Park Service prepared a report included in Chapter 6, Cooperative Planning. In that report the Se~ce only discusses the recreational development potential at the reservoir sites. It does not discuss impacts on the National Monument. (page 25-26) Another report by the National Park Service is included in a section on reports by cooperating agencies. It does not mention any concerns or operational requirements for the National Monument. (pages 51-63) B-8 '-.~..> - ~"".. .<'" , .. ;..... .~-' .' ....;.:!o: ~:.~. -_-." .-. ..... '0 , ' - - '. .......... ....~.