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<br />(';")1 Go" <br />1t.;,.J.. '1 . <br /> <br />RESULTS OF STUDIES <br /> <br />29 <br /> <br />total operating storage capacity in the entire system, In other <br />words, the omount of water in storage when all reservoirs in the <br />system are full, including Dillon and Gross reservoirs, would be <br />about equivalent to the City's requirements for a single year in <br />the late 1970's, It must be pointed out olso that the studies on <br />which Figures 4 and 5 are based were made on the assumption <br />that the chronological sequence of the occurrence of water sup- <br />plies would be the same as the actual historic occurrences from <br />1933 to 1954. Under the second study where the most severe <br />combination of low runoff years wos combined with a particular <br />segment of requirement in order to determine the most severe <br />combination of circumstances, it was found that under such <br />critical conditions the full capacity of Dillon Reservoir would be <br />required by about 1976 to insure a full supply of water for the <br />City through the early 1980's with a one-year reserve remaining <br />in storage, Therefore, other studies were made assuming Dillan <br />Reservoir constructed to its decreed capacity by 1976 and assum- <br />ing the water supply to be equivalent to that which occurred for <br />the years 1931 through 1954. These studies so far as require- <br />ments are concerned extended from October 1975 through <br />September 1998. The results of this operation are depicted on <br />Figure 6. <br /> <br />The upper graph on Figure 6 indicates the operation of <br />Dillon Reservoir, The second graph indicates the storage con- <br />tents of the South Platte reservoirs, and the lower graph indi- <br />cates accumulated amounts of Blue River water not diverted to <br />the South Platte, At the end of the period there is indicated on <br />the lower graph the amount of accumulated undiverted Blue <br />River water that would be storable in Two Forks or some other <br />holdover reservoir. <br /> <br />It may be noted from Figure 6 that Dillon Reservoir, as well <br />as the South Platte reservoirs, would remain essentially full <br />throughout the period of study except for the critical period from <br />1983 through 1988 so far as requirements are concerned, and <br />1939 through 1944 so far as water supply is concerned, <br /> <br />It must be pointed out that under the ossumptions made <br />the City's annual requirements would have reached a level equiv- <br />alent to the total average annual water supplies available to <br />