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<br />This plan represents a change in present irrigation and grazing <br />practices and will reduce salt loading to the river by S8 percent at a <br />one-time installation cost of $29,050,000 for improvements on private <br />land. <br /> <br />Plan No. 4 <br /> <br />This composite plan with management practices directed toward minimizing <br />deep percolation is the plan selected by the local people for imple- <br />mentation (Plan 4B). It represents variable participation in the program <br />according to the owner's needs and his capability to implement improvements. <br />It assumes that 20 percent of the irrigated acreage would remain at the <br />present level of improvement and water management; 20 percent of the <br />area would receive treatment at the level of Plan No.1; 40 percent of <br />the area would be raised to the level of Plan No.2, and 20 percent of <br />the area would go to the level of Plan No.3 with 300 acres of drip and <br />500 acres of sprinkler systems being installed. Plan No.3 for range- <br />land improvement also is included. <br /> <br />This plan will reduce salt loading to the river by 44 percent at a one <br />time installation cost of $23,620,000 for improvements on private land. <br /> <br />A tabulation of on-farm irrigation system and rangeland improvements for <br />the four alternative plans follows. Table 13 compares the alternatives <br />for improvements on irrigated cropland. Table 14 displays the three <br />plans for improvement on privately owned rangeland. Table 15 gives the <br />combined costs for making improvements, and Table 16 shows the combined <br />effect of each plan on salt load reduction. <br /> <br />\ <br /> <br />~~. <br /> <br />r" <br /> <br />40 <br />