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<br />. <br /> <br />The average annual plant product is projected to be 60,000 <br />acre-feet from 1982 through 1993, the period of hydrologic <br />operation studies. The corresponding average reject will <br />be 26,000 acre-feet. <br /> <br />The final desalting plant performance characteristics will <br />be determined during fina1 design after membrane equipment <br />contracts are awarded in 1977. The actual parameters will <br />probably vary somewhat from those presented herei n. <br />Specifically, the product sa1inity will probably differ <br />from 386 p/m and, consequent1y, the plant size will differ <br />from 108.5 Mga1/d. <br /> <br />Bypass Drain: <br /> <br />A bypass drain will be constructed to cary reject from <br />the desalting plant to the Santa Clara Slough in Mexico. <br />The concrete-lined drain wi11 be 50.7 miles long and have <br />a capacity of 353 cubic feet per second (ft3/s), and will <br />begin at the end of the MODE at Morelos Dam. The bypass <br />drain will be the same capacity as the MODE so that it can <br />carry the total MODE flow during desalting plant outages, <br />startups, and shutdowns. <br /> <br />MODE Siphon: <br /> <br />. <br /> <br />A buried circular concrete siphon has been constructed to <br />replace an existing 12-foot, 6-inch diameter semicircular <br />metal flume section of the MODE adjacent to the Colorado <br />River in Yuma at the foot of Prison Hill. The 3,491-foot- <br />long siphon is 10 feet in diameter and was completed in 1976. <br /> <br />Well ton-Mohawk Irrigation Efficiency Improvement Program: <br /> <br />An irrigation efficiency improvement program is in progress, <br />in conjunction with an acreage reduction program, to reduce <br />drainage flows in the Wellton-Mohawk Division to 167,000 <br />acre-feet by 1981, and ultimately to 136,000 acre-feet. <br />Separate subprograms of the overall program include <br />1) Irrigation Management Services, 2) onfarm improvements, <br />3) research and demonstrations, 4) extension education and <br />information, and 5) activities of the Technical Field Committee. <br /> <br />Well ton-Mohawk Acreage Reduction: <br /> <br />Irrigable land in the Division will be reduced from the <br />75,000 acres authorized for development to 65,000 acres. <br />This will eliminate economically marginal operations on <br />citrus land, and discontinue operation of land with the <br />lowest irrigation efficiency. The objective is to reduce <br />drainage return flows from land with low irrigation efficiency. <br /> <br />Painted Rock Reservoir Land Acquisition and Operation Schedule <br />Modification: <br /> <br />. <br /> <br />A number of potential alternative release schedules for <br />Painted Rock Dam floodwater storage have been studied by the <br /> <br />e <br />