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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Soil Conservation Service Estimates <br /> <br />Water and salt budgets developed by the SCS for present conditions are <br />presented in Figure II-2. A salt loading factor was developed based on an <br />inflow to the ground water system of 57,821 acre-feet from irrigation deep <br />percolation and canal loss and a .salt pickup in the ground water system of the <br />irrigation sector of 149,175 tons per year. This factor indicates that based <br />on SCS data, each acre-foot of water that can be prevented from entering the <br />ground water system in the agricultural area prevents 2.6 tans of salt per <br />year from entering the Colorado River. <br /> <br />Comparison of Estimates <br /> <br />This analysis was c~leted to compare budget estimates by the SCS and <br /> <br /> <br />Reclamation. This comparison was based on the deep percolation into the <br /> <br />ground water system. The salt loading factor of 2.4 tons/acre-foot by <br /> <br /> <br />Reclamation agrees closely with the salt loading factor of 2.6 tons/acre-foot <br /> <br /> <br />developed by the SCS. <br /> <br />The SCS has based its salt reduction on differences in return flow; however, <br />the SCS water budgets provide sufficient data to determine the changes in deep <br />percolation for various on-fam improvement options. For both on-fam and <br />off-fam systems a loading factor of 2.4 tons/acre-foot was used to determine <br />salt reduction. <br /> <br />o (} C C '! <br /> <br />II-3 <br />