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<br />30 <br /> <br />RESULTS of STUDIES <br /> <br />the City from all sources by about 1996. It must be understood, <br />however, that this is only an estimate and many factors which <br />have heretofore been indicated as being in a state of flux could <br />change the time when Denver's requirements had reached a level <br />equivalent to the average total supply available from all the <br />sources considered herein. However, for illustrative purposes it <br />is assumed that this combination of events would occur at about <br />that time. <br /> <br />To appraise the adequacy of the reservoir capacity which it <br />is assumed would exist at that time, consisting of about 508,700 <br />acre-feet, another study was made on an annual basis assuming <br />a recurrence of the water supply in the same chronological se- <br />quence as occurred for the period 1931 through 1954, with re- <br />quirements assumed to be constant after the time when they <br />become equivalent to the average water supply. Figure 7 shows <br />the results of this study. Attention is directed to the lower portion <br />of the graph which is captioned "Gross, South Platte and Dillon <br />Reservoirs." First the reservoir operation was carried through <br />to the approximate period when the estimated water require- <br />ments become equivalent to the average water supply for the <br />study period by assuming a Dillon Reservoir with a capacity of <br />18,200 acre-feet and then by assuming the increase in capacity <br />of Dillon Reservoir to 252,700 acre-feet by the end of 1975 at <br />which time it was assumed also that Williams Fork diversion <br />would be completed. By an inspection of Figure 7 it may be noted <br />that the 18,200 acre-foot Dillon Reservoir, together with the bal- <br />ance of the reservoir capacity on South Platte and in Gross Res- <br />ervoir, would carry the City through the period until the water <br />supply equals the requirement. However, because of contingen- <br />cies heretofore mentioned, it was assumed that the Dillon Res- <br />ervoir would be increased to its full capacity in 1975. The upper <br />curve of the lower graph indicates the total contents of all reser- <br />voirs under such condition. When the requirement becomes equiv- <br />alent to the average water supply the contents of the reservoirs <br />would be rapidly depleted during a succession of low runoff years. <br /> <br />The second portion of the graph designated as "8" repre- <br />sents the operation of an aggregate of 508,700 acre-feet of <br />storage at Gross, South Platte, and Dillon reservoirs in order to <br />