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<br />C.J <br />.,-4 <br />i..'J <br />..-4 <br /> <br />--, <br />-.- <br /> <br />ONFARM PROGRAM FOR <br />SALINITY CONTROL <br />GRAND VALLEY SALINITY STUDY <br /> <br />,.-, <br />...._~.. <br /> <br />Downstream benefits at Imperial Dam, determined from salt load reductions, <br /> <br />are estimated to be $43.00 per ton of salt. Local benefits consist of <br /> <br />increased crop yields derived from imprevements te onfarm irrigation systems <br /> <br />and management practices and empleyment benefits during construction. All <br /> <br />local benefits are included in this analysis; however, it is recognized that <br /> <br />some benefits will accrue through other than USDA programs, such as the <br /> <br />Water and Power Resources Service's canal and lateral improvements and their <br /> <br />Irrigation Management Services (IMS) program. <br /> <br />The total installation cost for the enlarged onfarm improvement program, <br /> <br />including $10,900,000 for off-farm laterals, is estimated to be $38,088,000. <br /> <br />The average annual cost is $3,305,000, amortized at 7-1/8 percent interest <br /> <br />over 25 years. Average annual benefits accruing through onfarm improvements <br /> <br />are $8,774,000, salt reduction benefits accruing through lining of off-farm <br /> <br />laterals are $4,300,000 annually,. Total annual benefits are $13,074,000, <br /> <br />compared with average annual costs of $3,305,000 for the selected plan. <br /> <br />Dividing the average annual cost by the annual net salt reduction for the <br /> <br />four plans presented results in costs ranging between $10.40 and $14.40 per <br /> <br />ton. See Table 17. <br /> <br />Revised November 1979 <br /> <br />45 <br />