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S T R U C T U R A L E F F E C T S A N D F E A S I B I L I T Y <br />LAND TREA'T'MENT <br />The effects of land treatment measures will be primarily on -site <br />conservation benefits of land improvement and efficient water management. <br />STRUCTURAL MEASURES <br />Rehabilitation of the lateral system to assure water delivery and <br />reduce seepage losses the primary purpose of the pi-oject. <br />A total of about 11,640 acres presently being irrigated, and about <br />600 additional acres, would benefit by the works of improvement. <br />The lateral lining proposed will save an estimated 5,390 acre -feet <br />of water annually. This savings is the difference between the amount <br />of water the State Water Commissioner delivered to the Company and the <br />amount the Company delivered to the farms during the period from 1960 <br />through 1970. This saving of water will reduce the amount of water that <br />would otherwise have to be pumped. <br />The 25 c.f.s. flume from Smith Reservoir. has served its life and <br />needs to be replaced. The Company has had high maintenance cost in <br />replacing the rotten timbers and have had to reduce its operating capacity <br />to 10 c.f.s. Several alternates for replacement wero calculated. <br />The least costly replacement is a 25 c.f.s. pumping plant and 7,000 <br />feet of lined lateral. By installing an additional 4,000 lineal feet of <br />If) c.f.s. lined ditch, 300 acres being irrigated from the Lindley Lateral <br />could be irrigated from reservoir water. This would eliminate 10,51;0 <br />feet of the Lindley Lateral which has an estimated seepage and evapor- <br />ation loss of 75 percent. An additional 600 acres could be irrigated <br />with reservoir water by adding another pump to the facility. <br />The proposed measures will reduce operation, maintenance, rind <br />replacement costs of the prosent irrigation facilities, reduce 3mo>i.111t <br />of water to be pumped, provide the opportunity for the operators to <br />increase their production through better water and soil management, and <br />provide storage water to 600 additional acres. <br />The annual cost for amortization of structural reasures for a <br />50 -year project life at 5 -3/8 percent interest rate and including <br />operation and maintenance is estimated to be $48,440. The total annual <br />benefits for the purposes included are estimated to be $116,260. The <br />resulting benefit -cast ratio is 2.4 to 1.0. See Table IV for a compar- <br />ison of benefits and costs. <br />