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<br />15 <br /> <br />in FY 1977, As resources and technical personnel become availi'.ble, <br />other high salt yield areas will be included in t~e Investigations to <br />determine present irrigation system and irrigatiGn eFicien<:ies. In tbe <br />areas with salt pickup of le55 than one t0n per acre irrigated per year, <br />the irrigation system and water management improvement needs will be <br />determined on a sampling basis. <br /> <br />Using a computerized water t"equi lernents model, the impacts of present <br />and three alternative levels of water management wi II be evaluated for <br />the lower Gunnison Basin Unit. 1\1ternatives will De evaluated to esti:nate <br />the impacts and cost of the pote:,cic:l improvement programs. The study <br />will determine the potentia] for improJerl water management within the <br />project area, ircluding the part.,time and small aCI"eage opu'al;O'''S" <br /> <br />Opportunities for technological improvements, such as <br />bubbler, or drip irrigation systems, will be explored <br />reducing deep percolation and tailwater return flow, <br />ments and impacts also will be evaluated. <br /> <br />2Ul:0ln<:..tted sp(!!':klc <br />as a r:lleans of <br />Drainage require- <br /> <br />Watershed Treatment Needs <br /> <br />Evaluation of problems on privately-owned upland watershed areas wi] 1 <br />concentrate on reducing erosion and sediment yields in the very high <br />sediment yield area (1,0 to 3.0 tons/square mile/year). This comprises <br />approximately 138 square miles in the lower Uncompahgre and Delta areas <br />having sal ine subsurface soils associated with Mancos shale. <br /> <br />Evaluation of problems and needs on National Resource lands will be made <br />by the Bureau of Land Management. Coordination wi] 1 be maintained with <br />the Bureau of land Management, <br /> <br />Socioeconomic, Institutional, Environmental, and Agronomic Assessments <br /> <br />Assessments of socioeconomic, institutional, environmental, and agronomic <br />factors in the basin will be m9de. These assessments wil I include the <br />present condition as wel I as expected condition under each of the alter- <br />native plans developed. <br /> <br />Formulation of Alternative Plans <br /> <br />Alternative plans will be developed for three levels of management, The <br />amount and type of treatment needed for each plan will be shown, <br /> <br />Impacts, Costs, and Displays for Alternative Plans <br /> <br />The alternatives will be evaluated to determine the economic, salt and <br />water budget impacts. Evaluation of potential impact on yields, irrigation <br /> <br />003064 <br />