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<br />002043 <br /> <br />Consumption from and Releases from Hoover Dam <br />(1,000 Acre-feet per year) <br /> <br /> Type of Year as Determined by Secretary <br /> ISC <br /> Flood Plus <br /> Control ISC Delta <br />Water Use Surplus Surplus Deliveries Normal <br />Arizona 3,200 2,800 2,800 2,800 <br />California 5,300 5,300 5,300 4,400 <br />Nevada 400 300 JQQ 300 <br />Subtotal 8,900 8,400 8,400 7,500 <br />Mexico 1,700 1,500 1,500 1,500 <br />River Losses 500 500 500 500 <br />Bypass Drain 120 120 158 120 <br />Total Release 11,220 10,520 10,558 9,630 <br /> <br />Under ordinary circumstances, Arizona would assume the shortages associated with the ISC. <br />Because California water users are the primary beneficiaries of the ISC, ,the ISC contain a <br />"reparation" provision whereby California (i.e., The Metropolitan Water District of Southern <br />California) will accept additional ~ona shortages that are caused through operation of the ISC. A <br />similar approach might be appropriate for the Delta. <br /> <br />D. Implications for Water Users in Mexico <br /> <br />Since the water right purchaser will continue to pay associated water delivery fees, other <br />water users will not bear any additional CNA costs resulting from the purchase. There may be a <br />minor reduction in the overall CNA operating costs since drainage pumping in areas outside the <br />~ompaction Zone may be reduced or eliminated. <br /> <br />This proposed delivery of 38,000 acre-feet per year of Yuma area brackish water to the Delta <br />should result in reducing the salinity of water delivered at the Southerly International Boundary by <br />26 mg/l, and the potential for water quality spikes at that site would also be reduced This option <br />also would allow the Minute 242 salinity differential between Imperial Dam and the Northerly <br />International Boundary to be reduced from 115 ppm + 30 ppm to 89 ppm + 30 ppm. (See <br />Appendix A for detailed estimates of the changes in salinity that would be expected through <br />implementation of the proposed diversion of Yuma area irrigation return flows.) <br /> <br />The purchase and retirement of 2,000 hectares of farmland in District 014 could adversely <br />impact the local agricultural economy. Nevertheless, it is anticipated that the reduction in the <br />salinity of water delivered under the Treaty will improve the productivity of remaining farms <br />throughout District 014. Quantification of the value of these impacts and benefits is beyond the <br />scope of this report, but will be assessed if the recommendations proceed. <br /> <br />28 <br /> <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 />J <br />I <br />I <br />