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<br />MAY 1982 <br /> <br />would be achieved by properly controlling the time of set and the flow rate <br /> <br />using existing surface irrigation systems. The off-farm group ditches would <br /> <br />be placed in pipe to preserve gravity pressure for operating the sprinklers. <br /> <br />Additionally, pipeline, gated pipe, or ditch lining is included to reduce <br /> <br />ditch seepage from land not being converted to sprinkler systems. <br /> <br />This plan can be implemented at a one-time construction cost of <br /> <br />$21,735,000. Technical assistance and administrative costs, estimated to be <br /> <br />$4,374,000, make a total installation cost of $26,082,000. <br /> <br />The capitalized Annual Cost including operation, maintenance and <br /> <br />replacement is $3,121,300. Capitalized annual net benefits are estimated to <br /> <br />be $33U,600. <br /> <br />Implementation of this plan would not increase the amount of water <br /> <br />diverted annually for irrigation. Seepage from onfarm ditches would be <br /> <br />reduced by 3,000 acre-feet and deep percolation would be reduced by 25,OOu <br /> <br />acre-feet. Improved onfarm management of irrigation water would provide <br /> <br />54,000 acre-feet of water for consumptive use by farm crops throughout the <br /> <br />valley. Annual return flow to the river systems, the sum of seepage, deep <br /> <br />percolation and tailwater runoff, would be reduced by 30,000 acre-feet (Bee <br /> <br />Table AI-4). <br /> <br />The 31,000 ton reduction in salt load represents a 57 percent reduction <br /> <br />in the total salt load being delivered to the Colorado River from onfarID <br /> <br />irrigation sources in the HcElmo Creek Basin. <br /> <br />V-IO <br /> <br />.s~l\ <br />C;C ). <br /> <br />i:j;i'ik"""""","" <br />