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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3694 <br />Moapa Valley Subevaluation unit (SCS) - Nevada <br /> <br />The Moapa Valley Subevaluation Unit, Nevada, is the first <br />part of a study of the Virgin River Unit in Arizona, Nevada, and <br />Utah. Located in:southeastern Nevada, the Muddy River flows <br />through the Moapa Valley into Lake Mead. The river contributes <br />an average of 73,400 tons of salt annually to Lake Mead. The <br />SCS Salinity Control Study, completed in February of 1981, <br />identified a potential to reduce salt loading by 19,500 tons with <br />improvements to water management systems and water delivery <br />systems. <br /> <br />The preferred alternative would improve canal, pipeline and <br />lateral systems, on-farm irrigation systems, and erosion <br />control. Off-farm delivery systems will be improved by <br />installing approximately 80,000 feet of pipeline and lining <br />another 1,400 feet. On-farm systems improvements would take the <br />form of pipeline installation and ditch lining with appurtenant <br />items for irrigation automation and water measuring. If <br />implemented, the proposal could result in ~.O mg/L reduction in <br />salt concentration at Imperial Dam at a cost of <br />$489,000 mg/L/year. <br /> <br />Implementation of the proposal will be held up indefinitely <br />pending funding clarification. <br /> <br />DRS/gl <br />12/9/81 <br /> <br />-27- <br />