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<br />003138 <br /> <br />Page 37 <br /> <br />In the basin-wide model, the Lee Ferry obligation was set at 8.23 MAF and <br /> <br />satisfied before any demand or storage in the Upper Basin. <br /> <br />The Department. of the Interior, through the U.S Corps of Engineers, is <br /> <br />required to operate Lake Mead to certain criteria in order to provide a measure <br /> <br />of flood protection to downstream areas. These criteria are set out in the <br /> <br />field working agreement between the Corps of Engineers and the Bureau of <br /> <br />Reclamation (USCOE, USBR, 1982). They specify that a flood pool of a minimum of <br />5.35 MAF be available in Lake Mead on January 1 of each year. In order to <br /> <br />simulate the evacuation which must occur, it was necessary for a separate flood <br /> <br />control reservoir to be created. This reservoir, called the Mead Flood Control <br /> <br />Reservoir, was filled, during the Spring Runoff, Irrigation, and Winter Seasons, <br /> <br />after any other reservoir or demand in the Lower Basin <br /> <br />~ <br /> <br />To simulate the flood control evacuation, a demand was invoked at the Gulf <br /> <br />of California which was larger than the sum of any inflow which could occur at <br /> <br />Lee Ferry plus the capacity of the flood control reservoir. This demand <br /> <br />operated only during the winter season (which ends on December 31) and was <br /> <br />subordinate to all other system reservoirs and demands except the flood control <br /> <br />reservoir (see Table 111-3). The result was that the flood control space was <br /> <br />evacuated on January 1, if not by useful consumptive demands, then by the flood <br /> <br />control demand. <br /> <br />~ <br /> <br />A delivery of 1.5 MAF from node 35 was satisfied before all basin demands <br /> <br />or storage. <br />