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<br />0:097 <br /> <br />MANNER OF MAKING THE STUDIES <br /> <br />17 <br /> <br />In all, a tatal of 14 studies were made of the operation of <br />the Moffat system under various assumed conditions. Table No. <br />3 indicates the various works and their capacities that were as- <br />sumed to be in operation under each of the fourteen studies, as <br />well as the requirement and water supply periods covered by each <br />study. <br /> <br />One purpose of the foregoing studies was to appraise the <br />economics of enlarging Gross Reservoir, It was constructed to an <br />original capacity of 42,000 acre-feet with provision for ultimate <br />enlargement to 113,000 acre-feet, Another purpose of the studies <br />was to appraise the desirability of completing the Williams Fork <br />diversion as a part of the current construction program. <br /> <br />Insofar as the over-all system and its various physical works <br />are concerned, two major sets of river and reservoir operation <br />studies were made. In general they followed the conventional <br />method, assuming a water supply equivalent to that occurring <br />during the study period and in the same chronological sequence, <br />In the first set of these studies what might be called the irreducible <br />minimum of facilities was assumed, The beginning of the study <br />so far as requirements are concerned was October 1957, and the <br />end was September 1978. The water supply was taken as equival- <br />ent to that of the years 1933 through 1954. The water require- <br />ment for the first year of the period was set against the water <br />supply equivalent to that which occurred in 1933, and the re- <br />quirement was increased year by year and matched against the <br />water supply during the study period in chronological order, The <br />irreducible minimum facilities that were assumed were the pres- <br />ent South Platte reservoirs, with, however, the capacity of Eleven <br />Mile Reservoir increased by 30,000 acre-feet in 1965, Gross <br />Reservoir with a capacity of 42,000 acre-feet, the Moffat Filter <br />Plant limited to its present capacity, and Dillon Reservoir con- <br />structed to a live capacity of 18,200 acre-feet which is the capac- <br />ity required to permit the diversion of the decreed amount of 788 <br />cubic feet per second through the Harold D, Roberts Tunnel. For <br />this study it was assumed that Williams Fork diversion would not <br />have been completed, Two studies were made under these assump- <br />tions, one assuming no power generation at Gross Reservoir and <br />another based on the generation of 7000 kilowatts of firm power, <br />