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<br />Executive Summary <br /> <br />. Investigating techniques to recycle the <br />waste calciUID carbonate sludge using <br />waste heat from a turbine generator <br />(potential annual savings of $2 million). <br /> <br />. <br /> <br />Implementing cost-effective solutions <br />identified by this program would sig- <br />nificantly reduce operation and main- <br />tenance costs, Reclamation also plans to <br />develop a technical review committee to <br />review and recommend improvements to the <br />YDP and its operations. <br /> <br />t <br /> <br />WMIDD Irrigation Drainage <br />Reduction Program <br /> <br />This program has reduced WMIDD <br />irrigation drainage pumping and, thus, the <br />required size of the YDP by imIlroving <br />irrigation efficiencies and reducing irrigated <br />acreage. Before the program was initiated, <br />irrigation efficiency was about 56 percent, <br />While the program was active, irrigation <br />efficiency met and exceeded the target <br />efficiency of 72 percent. Irrigation drainage <br />dropped from 220,000 acre-feet to a low of <br />118,500 acre-feet per year, and irrigated <br />lands were reduced by 10,000 acres. <br /> <br />The permanent measures implemented by <br />WMIDD are still in use, although no active <br />Federal program currently exists, Irriga- <br />tion efficiency has declined to about 60 per- <br />cent, and irrigation drainage pumping has <br />increased to about 145,000 acre-feet per <br />year, <br /> <br />" <br /> <br />Reclamation continues to investigate the <br />causes of increased irrigation drainage <br />pumping. As part of its continuing Title I <br />activities, Reclamation, together with the <br />WMIDD, Soil Conservation Service, and <br />others, will explore irrigation efficiency <br /> <br />~ <br /> <br />improvement measures, with a goal of <br />permanently reducing irrigation drainage <br />pumping to 108,000 acre-feet or less per <br />year, <br /> <br />In addition to the Title I activities described <br />above, the Salt River Pima Maricopa Indian <br />Community Water Rights Settlement Act of <br />1988, executed in 1991, reduced WMIDD <br />irrigated lands by an additional 2,125 acres <br />and reduced WMIDD maximum con- <br />tractual consumptive use from 300,000 to <br />278,000 acre.feet per year. <br /> <br />Coachella Canal Lining <br /> <br />Concrete lining of the first 49 miles of the <br />Coachella Canal was completed in 1982. <br />Since then, water conserved as a result of <br />lining the canal (an estimated 132,000 acre- <br />feet per year) has been credited toward the <br />replacement ofWMIDD irrigation drainage <br />bypassed to comply with the salinity <br />differential,l <br /> <br />Protective and Regulatory Pumping <br />Unit <br /> <br />The PRPU was constructed to manage and <br />conserve ground water for the United States <br />and for delivery to Mexico, Currently, 21 of <br />the planned full complement of 35 wells and <br />associated structures have been completed. <br />With 35 wells, the PRPU would be capable <br />of producing about 160,000 acre.feet of <br />water per year, <br /> <br />mtimately, approximately 125,000 acre-feet <br />of water from the PRPU, combined with <br />15,000 acre-feet of water from wasteways <br />and drains in the Yuma Valley, would <br />furnish 140,000 acre.feet of Mexico's total <br />1.5-million-acre-foot annual entitlement, <br /> <br />1 Except at aw:h times when there ezieted surplus water of the Colorado River under the terms of the 1944 <br />wster treaty with Mazico (1983 through 1988), <br /> <br />ES-3 <br />