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<br />," <br /> <br />influence on the supply available to Evergreen's No.2 water right <br />are the future disposition of the Denver Board of Water Commissioners' <br />share of the No.2 priority water right and the disposition of the <br />No.1 priority water right, of which the City of Englewood presently <br />owns 92% or 10.6 cfs. <br /> <br />This study shows that droughts during the irrigation season are <br /> <br /> <br />the most critical and that Evergreen's No.2 priority water right could <br /> <br /> <br />supply a demand of 4.000 equivalent residental taps during a recurrence <br /> <br /> <br />of the 1954 summer drought if the ~icBroom Di tch call is 1 im; ted to <br /> <br /> <br />6 cfs. Some minor irrigation curtailment would be required. If the <br /> <br /> <br />McBroom call were 10.6 cfs, then raw water storage of approximately <br /> <br /> <br />55 acre-feet would be required to supply the demand. The 1954 drought <br /> <br /> <br />has an estimated frequency of occurraoce of once in 16 years on the <br /> <br />-23- <br /> <br /> <br />average. <br /> <br />A recur ranee of the drought of 1963 would cause severe shortages <br /> <br /> <br />to both the base use and irrigation use for not only 4,000 taps but <br /> <br /> <br />for the existing 2,390 equivalent taps. To meet the demand during <br /> <br /> <br />this drought would require 163 acre-feet and 296 acre-feet of raw <br /> <br /> <br />water storage for the McBroom Ditch calls of 6 and 10.6 cfs, respect- <br /> <br /> <br />ively. This storage would provide a high degree of protection considering <br /> <br /> <br />that the expected return period of the 1963 drought is probably in <br /> <br /> <br />the range of 40 to 100 years. <br /> <br />The 1978 drought is by far the most severe on record and has <br /> <br /> <br />an expected return period of from 70 to probably greater than 10D <br /> <br /> <br />years. We do not bel ieve it is appropriate to plan for irrigation <br /> <br /> <br />in such an extreme drought. Base use demands for 4,000 taps could be <br /> <br /> <br />met by providing 70 and 200 acre-feet of storage for the McBroom Ditch <br /> <br /> <br />calls of 6 and 10.6 cfs, respectively. Shortage for a demand of <br /> <br /> <br />2,390 taps could be met by providing 28 and 124 acre-feet of storage <br /> <br /> <br />for the McBroom Ditch cal Is of 6 and 10.6 cfs. <br />