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<br />NEVADA: <br /> <br />003355 <br /> <br />East Walker River <br /> <br />During FY-85, the SCS in Nevada conducted a water conservation study <br />for the 13,500 acre area irrigated from the East Walker River in <br />Mason Valley, Nevada. Problems addressed were sediment in the water <br />supply, undependable diversion facilities, water loss from excess <br />length of unlined conveyances, and inadequate facilities for on-farm <br />irrigation water management. <br /> <br />Economically feasible and environmentally acceptable actions to <br />alleviate problems in the East Walker area developed during the <br />study include: <br /> <br />1. Permanent river diversions with sediment sluices, radial <br />gates. and settling ponds at one of two possible locations. <br /> <br />2, Maintenance of drop structures at present diversion <br />locations which are replaced by new facilities. <br /> <br />3 . Depending on diversion location. 26 or 30mi 1 es of new canal <br />to replace up to 43 miles of existing conveyance. Allor <br />part would be concrete lined, <br /> <br />4, On-farm improvements for irrigation water management on <br />4500 or 5000 acres depending on the diversion location. <br /> <br />Benefit-cost ratios for four combinations of the possible actions <br />range from 1,1:1 to 1,43:1. Project costs range from $3.6 million <br />to $5,5 million for the various combinations. <br /> <br />The Walker River Irrigation District board has voted to sponsor an <br />application for planning under the Small Watershed Act (PL-56€l that <br />will lead to implementation. <br /> <br />Main Walker Area <br /> <br />During FY-86. SCS in Nevada plans to conduct a water conservation <br />study for some 37,000 acres north of Yerington in Mason Valley, NV. <br /> <br />Problems to be addressed in the study include: <br /> <br />1. Inadequate river diversions. <br />2. Sediment deposits in fields and water conveyances. <br />3. High seepage loss in longer than needed unlined conveyances, <br />4. Inadequate on-farm irrigation and water management. <br />5. Soil salinity buildup and reduced water quality in return <br />flows. <br /> <br />Study findings are expected to include possible ways of solving <br />problems in the area and lead to a "project" approach for <br />implementation of solutions. <br /> <br />'u-S <br /> <br />,1; >: <br />