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<br />.. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />day represents a composite figure including all types of usage. Similar <br /> <br /> <br />studies were made for 1976 and 1977 and it was calculated that non- <br /> <br /> <br />irrigation month consumption was 192 and 198 gal Ions per tap per day, <br /> <br /> <br />respectively. The average of these three values was adopted as average <br /> <br /> <br />base use per tap for this study, i.e. 199 gallons per tap per day. <br /> <br />. <br /> <br />. <br /> <br />Irrigation usage varies greatly by months. Utilizing the 1976, <br /> <br /> <br />1977 and 1978 use data and assuming the base use calculated for each <br /> <br /> <br />year and an average irrigation season of mid-May through Mid-October, <br /> <br /> <br />calculations of irrigation diversions were made by subtracting base <br /> <br /> <br />use from total use. Hiwan Golf Course consumption was subtracted <br /> <br /> <br />from total irrigation quantities. Estimates of acres under irrigation, <br /> <br /> <br />excluding the Golf Course, for each year, were calculated assuming <br /> <br /> <br />an irrigation efficiency of 70% and applying computed consumptive <br /> <br /> <br />use in feet to the estimated irrigation diversion. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />I <br /> <br />Estimates of consumptive use of irrigation water were made, treating <br /> <br /> <br />the Evergreen irrigation as a high altitude area. The crop coefficients <br /> <br /> <br />for May through October were taken as the average of coefficients <br /> <br /> <br />calculated from lysimeter measurements for South Park Mountain Meadows. <br /> <br /> <br />Util izing these coefficients, and temperature and precipitation dati: <br /> <br /> <br />it was calculated that approximately 60.6, 41.0, and 66.9 acres were <br /> <br /> <br />uoder irrigation for 1976, 1977 and 1978 respectively, excluding the <br /> <br /> <br />Golf Course. The maximum irrigated area per tap occurred in 1978 <br /> <br /> <br />when 1,220 square feet was calculated. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />In making estimates of irrigation demands for future use on the <br /> <br /> <br />system, a higher figure by 100 square feet was adopted to provide <br /> <br /> <br />for larger lots and it was assumed that 1,320 square feet per tap <br /> <br /> <br />,"ould be irrigated and that the irrigation efficiency would be 70%. <br /> <br /> <br />Demand projections per 1,000 taps for the critical drought years, <br /> <br /> <br />1954, 1963 aod 1978 are shown in Table 4. Demands for any desired <br /> <br /> <br />number of taps may be obtained by multiplying the figures shown by <br /> <br /> <br />the number of 1,000 taps desired, then adding in the Hiwan Golf <br /> <br /> <br />irrigation demand. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />-10- <br /> <br />I <br />