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<br />.. <br /> <br />.' <br /> <br />.. <br /> <br />II <br /> <br />I <br /> <br />III <br /> <br />II <br />I <br />. <br />I <br />I <br />II <br /> <br />I <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />. <br />II <br />~ <br />I <br />. <br /> <br />. <br />. <br />I <br />~ <br />~ <br />C <br />I <br /> <br />Water Supply <br /> <br />Water supply as used herein is defined as the quantity of water <br /> <br /> <br />legally and physically available for diversion. Estimates of the <br /> <br /> <br />supply to Evergreen's No.2 priority water right were made from studies <br /> <br /> <br />of several historical drought periods. Under circumstances of a re- <br /> <br /> <br />currence of the hydrological events of each period, estimates of water <br /> <br /> <br />available to the No.2 right were made under expected future conditions <br /> <br /> <br />with regard to competing water rights. <br /> <br />Daily analyses were made for droughts occujring during the irri- <br /> <br /> <br />gation season utilizing stream flow records for Bear Creek at Morrison <br /> <br /> <br />and at Sheridan, diversion records. as kept by the District 9 Water <br /> <br /> <br />Commissioner and average caily temperature and precipitation data <br /> <br /> <br />obtained from published monthly records. The low-flow periods of <br /> <br /> <br />July-October 1978, June-August 1963 and June-September 195~ were analyzed. <br /> <br />Table 7 shows the calculated shortages of water for the indicated <br />drought periods. A shortage occurs when the supply is less than the <br />demand and is the difference between the demand and supply. <br /> <br />., <br /> <br />Based on results of the daily water supply analyses it is concluded <br /> <br /> <br />that the preseot system could, for all practical purposes, supply <br /> <br /> <br />~,OOO taps for a recurrence of the 195~ drought, assuming the McBroom <br /> <br /> <br />Ditch call to be 6 cfs. This drought would on the average occur once <br /> <br /> <br />in 16 years. Irrigation could be curtailed by 0.05 cfs during 3 days <br /> <br /> <br />of September to compensate for the shortage of 0.3 acre-feet. If <br /> <br /> <br />the McBroom Ditch call was 10.6 cfs for the 195~ drought, the demand <br /> <br /> <br />for ~,OOO taps would exceed the supply by an average of 0.20 cfs for <br /> <br /> <br />5 days, 0.70 cfs for 1 day and 2.10 cfs for 5 days in June, by an <br /> <br /> <br />average of 1.0 cfs for 3 days, and 1.9 cfs for 1 day in July, and <br /> <br /> <br />by an average of 2.15 cfs for 3 days and 0.35 cfs for ~ days during <br /> <br /> <br />September. Shortages and the demands for 195~, 1963 and 1978 for <br /> <br /> <br />~,OOO taps are shown graphically on Figure 2, Sheets 1 and 2. <br /> <br />-19- <br />