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<br />.' <br /> <br />2. <br /> <br />1963 Drought Conditions. <br /> <br />:1 <br />I <br /> <br />Under conditions of a McBroom Ditch call of 6 cfs. the system <br /> <br /> <br />would require 163 acre-feet of storage to meet the total demand <br /> <br /> <br />and 18 acre-feet to meet the base use demand for 4,000 taps. Under <br /> <br /> <br />conditions of a McBroom Ditch call of 10.6 cfs, the system would <br /> <br /> <br />require 296 acre-feet of storage to meet the total demand and <br /> <br /> <br />107 acre-feet to meet base use demand for 4,000 taps. The system <br /> <br /> <br />could not meet the base use demand for 2,390 taps without storage <br /> <br /> <br />for McBroom calls of 6 and 10.6 cfs for this drought, being short <br /> <br /> <br />by 5 and 54 acre-feet, respectively. The. 1963 drought is much more <br /> <br /> <br />severe that the 1954, having a frequency of occurrence of once in <br /> <br /> <br />40 to 100 years on the average. <br /> <br />I <br />:1 <br />i <br /> <br />:1 <br />, <br /> <br />i:1 <br /> <br />3. 1978 Drought Conditions. <br /> <br />This is the most severe drought on record with an expected <br /> <br /> <br />occurence of once in 70 to 100 years or more on an average. The <br /> <br /> <br />system ~lOuld require 260 acre-feet and 425 acre-feet of storage <br /> <br /> <br />to meet the tctal demand for 4,000 taps for McBroom Ditch Calls <br /> <br /> <br />of 6 and 10.6 cfs,. respectively. Base use demands for 4,000 <br /> <br /> <br />taps could be met by provision of 70 acre-feet and 200 acre-feet <br /> <br /> <br />for the 6 and 10.6 cfs McBroom Ditch Calls. The system could <br /> <br /> <br />not meet base use demand for 2.390 taps for McBroom Ditch calls <br /> <br /> <br />of 6 and 10.6 cfs, being short by 25 and 113 acre-feet, respectively. <br /> <br />," <br /> <br />4. Raw wate~ storage should be added to the system. A reasonable <br /> <br /> <br />approach to planning for storage would be to initially provide <br /> <br /> <br />130 acre-feet with subsequent studies as the system grows and <br /> <br /> <br />provision of ~dditional storage as appropriate. This approach can <br /> <br /> <br />take into account a phased expansion if the economics of such a <br /> <br /> <br />plan is justified. Studies should be made to determine the most <br /> <br /> <br />economic plan. The provision of 130 acre-feet will accomplish the <br /> <br /> <br />following: <br /> <br />-2- <br />