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<br />r..-' <br />[~'" <br /> <br />l!"',," <br />~." <br />,,,;"-i- <br /> <br />, I <br /> <br />::> <br /> <br />o::r <br />:"": <br />-. <br />- <br /> <br />Many factors serve to modify the size of the flows released at <br />Parker Dam in the l48-mile river reach downstream to Imperial Dam. <br />The amount of water arriving at Imperial Dam after its 3-day journey <br />is seldom the precise quantity needed to meet actual irrigation <br />requirements. The remote controlled pump-generator units at <br />Senator Wash Pumping-Generating Plant assist in controlling <br />unscheduled changes in diversion needs at Imperial Dam. The facility <br />has also become extremely valuable during periods of cold weather by <br />providing "freeze" water that otherwise would not be available to the <br />Districts. <br /> <br />c <br /> <br />During calendar year 1981, there were 144,070 acre-feet pumped to <br />Senator Wash Reservoir and 88,520 acre-feet were released. The <br />pump-generating units have provided excellent service during 1981. <br />Computer controls and an alarm monitoring system were installed in <br />1981. The pump-generator units can now be operated manually or by <br />computer. Improvements to the computer system are still underway. <br /> <br />Senator Wash Reservoir also provides additional recreational, fish, <br />and wildlife opportunities. <br /> <br />5. Yuma Mesa Well Field and Pump Outlet Channel <br /> <br />The Yuma Mesa Well Field consists of twelve, 24-inch diameter deep <br />wells with a total rated capacity of 100 cfs. Collection lines convey <br />the water to the pump outlet channel that discharges into the <br />Colorado River about 5 miles upstream .from the Northern International <br />Boundary with Mexico. <br /> <br />The pumps provide drainage in the Yuma Valley and are used for <br />salinity control and water regulation of the delivery of water to <br />Mexico. General operation of these pumps are by remote control from <br />Imperial Dam. The pumps were off for several months during the year <br />to conserve energy because the pumpage was not needed and would have <br />only increased the amount of overdelivery to Mexico. However, three <br />to five pumps were operated most of the time to provide drainage <br />relief to critical areas with drainage problems in the Yuma Valley, <br />The well field provided a total discharge of 28,120 acre-feet to the <br />river in 1981. <br /> <br />V. OPERATION AND MAINTENANCE OF WORKS TRANSFERRED TO THE IMPERIAL <br />IRRIGATION DISTRICT <br /> <br />1. Organization <br /> <br />The supervisory organization of the Imperial Irrigation District for <br />the O&M of the works transferred is shown below: <br /> <br />Mr. J. R. Wilson, Manager, <br />Water Department <br /> <br />6 <br />