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<br />(..0 <br />.-4 <br />:'-..1 <br />....-4 <br /> <br />.._1 <br />~--.:) <br /> <br />ONFARM PROGRAM FOR SALINITY CONTROL <br />GRAND VALLEY SALINITY STUDY <br /> <br />and the Orchard Mesa Power Canal systems, which are under repayment contract <br /> <br />to the WPRS. The remaining laterals needing improvement consist of about <br /> <br />238 miles.!./ and have an ,est imated one-t ime improvement cost of <br /> <br />$13,700,000. It is estimated that improvements will be installed on about <br /> <br />80 percent of the eligible laterals, or some 190 miles. Total installation <br /> <br />cost is estimated to be $10,900,000. <br /> <br />Water entering the groundwater supply from irrigatien practices ameunts te <br /> <br />about 150,000 acre-feet annually, with contributions of approximately 50,000 <br /> <br />acre-feet each from canal seepage, lateral seepage and onfarm seepage and <br /> <br />deep percolation.!/ It is estimated that 40 percent of the total <br /> <br />off-farm laterals require improvements to support the onfarm system <br /> <br />improvement measures for salinity centrol. Therefere, it is estimated that <br /> <br />proposed lateral improvements will reduce seepage by 20,000 acre-feet <br /> <br />annually, resulting in a salt load reduction of 100,000 tons per year. <br /> <br />_~/ Table A-l, page A-4, Environmental Assessment, Grand Valley Unit, <br />December 1977, USBR and SCS. <br /> <br />!/ Page B-10, Environmental Assessment, Grand Valley Unit, December 1977, <br />USBR and SCS. <br /> <br />Revised November 1979 <br /> <br />59a <br />