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<br />, <br /> <br />. <br /> <br />'I <br /> <br />"'I <br /> <br />j <br /> <br />, <br /> <br />wi <br /> <br />~ <br /> <br />- <br /> <br />. <br /> <br />- <br />- <br /> <br />- <br />"" <br /> <br />I <br />. <br />. <br />. <br />. <br />. <br /> <br />, <br /> <br />, <br /> <br />. <br />Small Reservoir Feasibility Study <br /> <br />5-10 <br /> <br />. <br /> <br />3. With suffident exchange sources available on the West Slope <br />and with development of the Straight Creek Project, Denver <br />can divert an average of 162,000 !IF per year from the Blue <br />River system. <br /> <br />4. Under maximum diversions by Denver, Dillon Reservoir levels <br />are still maintained near the summertime targets specified in <br />the Summit County Agreement except in dry years. However, <br />these levels are sensitive to assumptions about the pattern of <br />Denver diversions through the Roberts Tunnel and the <br />presence of new East Slope storage in the Denver system. In <br />the absence of such storage, target levels are likely to met less <br />frequently, <br /> <br />5. The tenns and provisions of Summit County Agreement do <br />not appear to limit the water supplies available to in-basin <br />users for their ultimate demands, although Copper Mountain <br />appears to have an insufficent allocation of subordination <br />water, There appear to be unused allocations of <br />subordination water available to reallocate to Copper <br />Mountain and, with suitable agreements, to support instream <br />flow maintenance below Dillon. <br /> <br />Based on the analyses of alternative water development and management measures <br />carried out in the study, the following conclusions can be drawn: <br /> <br />1. A new storage facility of 2200 !IF capacity on Peru Creek could <br />alleviate all snowmaking shortages on the Snake River arising <br />from the use by exchange of water from the Green Mountain <br />Sales Pool. Releases from this reservoir could bring the <br />minimum instream flow up to the decreed rate of 6 cfs. <br />Under a new agreement with Denver permitting out-of- <br />priority storage the reservoir would fill in 2 out of 3 years and <br />evaporate approximately 70 !IF of water annually. It would <br />cost approximately $6.5 million to construct. However, <br />because the facility would provide relatively small and <br />infrequent water supply benefits, it would probably not pass a <br />. strict test of economic feasibility. <br /> <br />2. An infi1tration gallery on Laskey Gulch cannot provide a <br />reliable emergency water supply for Dillon and Dillon Valley <br />in winter when demands are high and flows are low. <br />However, if used in conjunction with Summit County <br />allocations of subordination water and Dillon storage water, <br />Laskey Gulch is sufficient to meet ultimate wintertime <br />demands for one month. The gallery would cost between <br />$20-$30,000 to construct. <br /> <br />3. Rehabilitation of the Old Dillon Ditch/Reservoir system could <br />generate a linn yield of approximately 250 !IF per year <br />