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<br />001793' <br /> <br />. <br /> <br />. <br /> <br />acre-feet wauld probably he justified by the area abave Lake Brennan nat- <br /> <br /> <br />urally draining into. it. Since by diversions from neighbaring streams <br /> <br /> <br />the natural drainage area c('uJ.'l be increased by one-half, a much larger <br /> <br /> <br />reservair might, sa far 8S storable water is cnncerned, be justified. <br /> <br /> <br />Studies of reservoir cost indicated that for ~eservoir capaci- <br /> <br /> <br />ties increasing from 1,000 ncre-feet to at least 3,000 acre-feet there <br /> <br /> <br />was very little change in cost per acre-foot of capacity, but that, at <br /> <br /> <br />sama point between 3,000 and 4,000 acre-feet, cost per acre-foot begins <br /> <br /> <br />to rise rapidly, due to the rapid increase in embankment quantities and <br /> <br /> <br />length of dam, which at even 4,000 acre-feet calls for a practically con- <br /> <br /> <br />tinuous structure from the middle of the west side of the lake to and <br /> <br /> <br />acrass the south end. <br /> <br /> <br />It is estimated that a tatal storage of 1,000 acre-feet (615 <br /> <br /> <br />acre-feet in addition to present storage) is mare than sufficient for <br /> <br /> <br />present supply of Crested Butte and would protect it adequately in case <br /> <br /> <br />af any probable futurs growth. Since a reservair could be created, and <br /> <br /> <br />filled, uhich would store at least 2,000 acre-feet in additian to the needs <br /> <br /> <br />af Crested Butte, studies were made of probable uses for the starage in <br /> <br /> <br />excess of tawn needs, using 2,000 acre-feet as a basis. When justified, <br /> <br /> <br />mare detailed studiss might discloss that ths excess storage shauld not <br /> <br /> <br />be limited to 2,000 acre-fset but should be pushed up to the point where <br /> <br /> <br />unit reservoir cast breaks sharply to higher figures. <br /> <br /> <br />There seem to be several possible uses for the excess stored <br /> <br /> <br />water. Of these, hawever, the mast immediately justifiable would be as a <br /> <br /> <br />partial supplemental supply for the irrigation of meadow hay lands in <br /> <br /> <br />Ohio Creek valley. This valley extends from a point 3 miles north of <br /> <br />. <br /> <br />-d- <br />