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<br />. <br /> <br />'Jr. "' - <br />..V~.i-~~l <br /> <br />Hydrology <br /> <br />Since the South Platte River acts as a natural drain for the <br />basin, the return flow from irrigation continuously accrues to the <br />stream. Of the total return flow from project deliveries an estimated <br />24 percent can be reused. This factor was used in reducing reservoir <br />releases to meet downstream requirements. The remaining return flow <br />was assumed to be not available for diversion because of the time or <br />the location of return. The divertible return flow from the project <br />deliveries averaged 21,300 acre-feet per year. <br /> <br />. <br /> <br /> Table 12.--Historic water utilization <br />Item Acre-feet Producti ve Acre-feet <br /> acres per acre <br />River headgate supply 346 , 300 l56,500 2.22 <br />Farm headgate surface supply 164,200 156,500 1.05 <br />Farm pump suppl~l 86,900 156,500 2.=.2L <br />Total farm headgate supply 251,100 156,500 1.60 <br />Farm headgate supply - 6w lands 31,700 21,900 1.45 <br />Fam headgate supply - irrigable <br />lands 219,4.00 134,600 1.63 <br />Farm headgate requirement - <br />irrigable lands 290,900 134,600 2.16 <br />Farm headgate shortage - <br />irrigable lands 71,500 134,600 0.53 <br />Farm headga~e shortage on 1nter- <br />mittencly irrigated lands 4.1,700 19.6oo 2.13 <br />Total farm headgate shortage <br />on all irrigable lands 113,200 154,200 0.73 <br />Total river headgate shortage <br />on irrigable lands 182,800 154,200 1.18 <br /> <br />Note: Data in this table are for 23 of the 33 ditch systems in the <br />service area. The 23 ditches serve 98.4 percent of the <br />irrigable land in the district. <br /> <br />. <br /> <br />65 <br />