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e e WATER SUPPLY The District holds a 565 acre-feet of storage right at the Sams Knob reservoir site for domestic, municipal, irrigation, recreational, industrial and other beneficial uses. The original decree for the Reservoir was entered November 5, 1971, in Case No. 5884 of the Garfield County District Court with an appropriation date of March 22, 1967. The District has exercised reasonable diligence in the development of the conditional water rights, and the Water Court has most recently confirmed diligence in Case No. 90CW122. Al though the 1967 appropriation date is relatively recent, estimates indicate there is adequate water available under this priority to fill the reservoir in most, if not all years. Detailed evaluation of the water yield is recommended during the feasibility study. For purposes of this report, the annual reservoir yield is assumed to be the reservoir capacity. RESERVOIR Table 1 shows the elevation-area-capacity values for the reservoir. The area was taken from the elevation-area-capacity curves on the topographic drawing provided by the District. The capacity at the spillway crest elevation of 8252 feet is 537 acre-feet. The crest of the dam is planned to be at elevation 8267 feet. The stream channel is at elevation 8210 feet. The height of the dam is therefore 57 feet with a water depth of 42 feet to allow 15 feet of freeboard. The outlet pipe will be near the bottom of the reservoir so essentially all of the capacity will be useable. Pursuant to all agreement entered into on August 13, 1978, the District has agreed with the Board of County conunissioners of Pitkin County, Colorado, that Sam's Knob Reservoir shall include in its design, construction and operation, provisions for maintenance of the minimum stream flow levels on Snowmass Creek immediately below the dam. the maintenance of minimum stream flow levels was determined by the Board of County Commissioners and the District to mean that at all times the District would release from the Reservoir the natural inflow or 12 cubic feet per secondr whichever is less. When diverting through the Snowmass Creek Pipeline, the District would ensure that the outflow from the Reservoir is at least equal to the quantity of water diverted through the pipeline, except when an emergency water need of the District exists. Prior to the preparation of preliminary construction design drawings and specifications of the Reservoir, the District is obligated to consider all feasible alternatives to the construction of the Reservoir consistent with the Pitkin County Land Use Code. The Board of County Commissioners is to be given the opportunity to participate in the study, analysis and review of all such alternatives. The District further agreed to prepare an environmental impact appraisal in the nature of that required for major federal actions by 40 C.F.R. 1500. Sams Knob Dam 3