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l-" 01 C> C> ':~ .~ < .~ , ~:~ '! .. .~~ <j .:, :i:i :ii ~~t~ ..'~i "), " :.1 '.; .:--.. ..... ;j '::1 .~ :~ < :; ,. ., .. .' :~ ., ., ., :-:1 ':1 UInta Buln P_W.." f'rtca.&nRaIaeI '. ~W"" Moapa V~ LaaV_W.... CA CoachoIIaCINI U~._~ '. " .' , " " ''\.. ' ---------:--------~: '- -~-- , , Big sandy WY ~ ~ M='::a ~ ~ G_ocI-Dotoen> .__:___h__~~ =::- , ~1 CO _. Valley DaIofN/MoEImo San JUII1I R'- IN -PumpIng lIT NM Yuma 0a0aIIIn0 PIanl W_M_IDD .. " , ,. (' '- "\ RepubRcolMeJdco \ Pigure 2,--Map of Study Areas for Salinity Control. Reclamation evaluated alternatives to intercept the springs and seeps and then transport, treat and use, or dispose of the saline water. In the irrigated area, off-farm solutions' such as selective lining of canals and laterals were studied: Studies conducted in cooperation with OSDA indicated that control of onfarm irrigation is the most cost-effective alternative for controlling salinity from the Big Sandy Unit. Because of past selective lining programs, the canals and laterals showed relatively low seepage rates, offering little room for improvement. . The USDA Big Sandy Salinity Control Program Final Environmental Impact Sea.temellt: was published in September 1987, and the salinity control plan was released in February 1988. The plan recommends converting the existing surface irrigation systems on 15,700 acres to low-pressure sprinkler and other improved irrigation systems. Implementation of this plan will result in a reduction of 52,900 tons of salt. In 1988, a OSDA office was established in Farson, Wyoming, and implementation of the Colorado Salinity Control Program began. Participation by farmers in the program has been outstanding. As of September 1994, 68 low-pressure center pivot irrigation systems had been installed on 5,800 acres, 24