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<br />0;:'098 <br /> <br />MANNER OF MAKING THE STUDIES <br /> <br />19 <br /> <br />Another study wos made with the woter requirement be- <br />ginning in the yeor 1975 assuming sufficient capacity at Maffat <br />Filter Plant to process 011 of the Moffat Tunnel water and assum- <br />ing Dillon Reservoir to have been increased to its full decreed <br />capacity of 252,700 ocre-feet, and assuming Williams Fork diver- <br />sion to be completed, It was again ossumed that 7000 kilowatts <br />of firm power would be generated at the Gross power plant. In <br />this study the beginning water supply was assumed as that of <br />the yeor 1931, The study was run through September 1998 so for <br />os requirements were concerned, corresponding to the water <br />supply yeor of 1954, <br /> <br />Because of past experience with conventionol river and <br />reservoir operation studies in connection with some existing proj- <br />ects, other studies were mode in which the water requirements <br />of the metropol itan orea of Denver for certain future periods of <br />time were matched against that segment of water supply within <br />the study period which would result in the greatest reservoir <br />requirement or most critical condition if such segments of low <br />water supply were to recur in the future. <br /> <br />In order to appraise the economics of the provision of stor- <br />age, estimotes of cost were mode of constructing Dillon Reservoir <br />to various capacities, The minimum live capacity which was <br />seriously considered as a possible first-stage development of <br />Dillon Reservoir was the capacity required to permit diversion of <br />water through the Horold D, Roberts Tunnel up to its decreed <br />capacity of 788 cubic feet per second, <br /> <br />Physically, Two Forks Reservoir on the South Platte occupies <br />a competitive position with Dillon Reservoir for holdover purposes. <br />Estimates of cost were made of the construction of Two Forks <br />Reservoir to various capacities to provide holdover for existing <br />water supplies and those to be developed under the current pro- <br />gram, Economic studies were also made to determine the value of <br />constructing a reservoir such as Two Forks for long-time holdover, <br />the purpose of which would be to capture and retain Blue River <br />supplies not currently needed by Denver during the period when <br />the annual requirements would be less than the overage annual <br />water supply from all sources. <br />