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<br />h~ <br /> <br />. ,) <br />....t <br />....t <br />c:) install ing needed water control structures; and instill I ing water <br />o <br />2 measu ring dev ices. Genera 11 y the net app 1 i cat ion requ i rement for each <br /> <br />12 <br /> <br />3 irrigation is likely to be exceeded by a small margin because time of <br /> <br />4 set by 6-hour increments is the primary management practice change <br /> <br />5 recommended. The number of irrigations, each with a specified net <br /> <br />6 <br /> <br />application, will also be a recommended management change on most fields. <br /> <br />7 <br />8 <br /> <br />It is assumed for this alternative that 80 percent of the area (52,000 <br /> <br />acres) will receive improved water management and 80 percent of the <br /> <br />9 <br /> <br />above-mentioned measures will be installed. <br /> <br />10 <br /> <br />This level of improvement will reduce salt loading to the Colorado River <br /> <br />I] <br /> <br />by 44 percent at a one-time installation cost of $12.6 million for system <br /> <br />improvements. <br /> <br />J 3 A I ternat i ve 2 - (Management of t jme of set and flow rate) The second <br /> <br />]4 <br /> <br />15 <br />16 <br /> <br />17 <br />18 <br /> <br />19 <br /> <br />20 <br /> <br />21 <br /> <br />22 <br /> <br />23 <br />24 <br /> <br />level of analysis included changing both the time of set and the flow <br /> <br />rate and meeting the recommended net application as closely as possible. <br /> <br />Usually this analysis showed efficiency of irrigation to be higher than <br /> <br />that for present practice and for the first level of improvement. <br /> <br />Physical improvements for this level of improvement consist of all land <br /> <br />level ing, ditch lining or pipelines where this preference was expressed <br /> <br />by the landowner, water measuring devices, and subsurface drains <br /> <br />identified as needed improvements during field inventories. I t is <br /> <br />assumed for this alternative that management practices wil] be imple- <br /> <br />mented on 80 percent of the area (52,000 acres) and 80 percent of the <br /> <br />needed measures will be instal led. <br /> <br />37 <br />