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<br />, <br /> <br />. <br /> <br />Introduction. <br /> <br />This report presents the results of an evaluation of the water <br /> <br /> <br />supply to the Evergeen Water System in accordance with the agreement <br /> <br /> <br />between Blatchley Associates, Inc. and the Evergreen Sanitation District <br /> <br /> <br />dated February 14, 1979. Estimates of water available to the most -. <br /> <br /> <br />senior water right were made for selected historic drought periods, <br /> <br /> <br />and statistical analyses of the drought were made to predict frequency <br /> <br /> <br />of recurrence. Based on the estimates of water available for diversion, <br /> <br /> <br />predictions of the number of equivalent residential taps which could <br /> <br /> <br />be supplied were made. Finally, evaluations of the effects of raw <br /> <br /> <br />water storage were made. <br /> <br />II <br />I <br />i , <br />il <br /> <br />Conclusions <br /> <br />Estimates of water supply available to Evergreen's No.2 priority <br /> <br /> <br />water right for 6 cfs Were made from studies of several historical <br /> <br /> <br />drought periods. Under circumstances of a recurrence of each drought <br /> <br /> <br />period, estimates of water available to the No.2 water right were <br /> <br /> <br />made under assumed future conditions with regard to competing water <br /> <br /> <br />rights. The droughts of 1954, 1963 and 1978 were evalua~ed. The { <br /> <br /> <br />system contained 2,390 equivalent taps during 1978. <br /> <br />1. 1954 Drought Conditions. <br /> <br />The No.2 priority water right of 6 cfs will provide an adequate <br /> <br /> <br />source of supply for 4,000 equivalent residential taps for this <br /> <br /> <br />drought, assuming the McBroom Ditch (No. I priority water right) calls <br /> <br /> <br />do not exceed 6 cfs and that no calls occur from the South Platte <br /> <br /> <br />River. Very minor curtailment of irrigation would be required for <br /> <br /> <br />three days during the drought. The 1954 drought would be expected <br /> <br /> <br />to occur an average of I time in 16 years. If the McBroom Ditch <br /> <br /> <br />call were 10.6 cfs, the system would need 55 acre-feet of raw water <br /> <br /> <br />storage to supply the full demand of 4,000 equivalent taps, and <br /> <br /> <br />would need about 5 acre-feet to supply only base use other than . <br /> <br /> <br />irrigation. <br /> <br />-1- <br />