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<br />:.: -- <br /> <br />14 <br /> <br />L:"~ <br /> <br />,;,;.; <br />?-4 <br /> <br />(2) Consider diversions into main canals, laterals and turn- <br />out into fields. <br /> <br />(.~.:' <br /> <br />(3) Coordinate this evaluation with Bureau of Reclamation. <br /> <br />b. Prepare monthly and annual water requirements and present <br />deliveries for on-farm irrigation systems. <br /> <br />(1) Run irrigation water requirements for :Jresent and future <br />alternatives, from farm turnout to return to the river, <br />using the existing SCS computer model. <br /> <br />(2) Consider consumptive use by crops and consumptive inci- <br />dental losses. <br /> <br />(3) Consider deep percolation and surface runoff and outflow <br />to the river. <br /> <br />6. Run inflow-outflow salt eval1lations on geohydrologic segments for <br />present and selected levels of improvement. <br /> <br />a. Prepare monthly and annual evaluations for the salt load and <br />mineral constituents. <br /> <br />(1) Consider inflow from river, tributaries, and ground water. <br /> <br />(2) Consider diversions into main canals, laterals, and turn- <br />out into fields. <br /> <br />(3) Determine salt loading of surface return flows and subsur- <br />face irrigation return flows to the river. <br /> <br />(4) The salt budget will tie directly into the water quantity <br />budget to define water quality in the flow sequence. <br /> <br />(5) Coordinate evaluation with the Bureau of' Reclamation, the <br />Agricultural Research Service, and U.S. GeOlogical Survey. <br /> <br />7. Evaluate the benefits, costs, and impacts of improvement implementation. <br /> <br />a. Evaluate costs for three levels of implementation. <br /> <br />b. Evaluate benefits for three levels of implementation and make <br />benefit-cost comparisons. <br /> <br />c. Evaluate and summarize impacts for three levels of implementation. <br /> <br />8. Develop alternative implementation program using evaluation in Item <br />7, and inputs from local people regarding water pricing policies, <br />state laws, economics, and other related factors. <br />