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PUMPING REQUIREMENTS AND WATER LEVELS <br /> The proposed barrier across the upstream end of Robinson Reservoir will divide the <br /> reservoir into two separate bodies of water that will be connected by a culvert with a <br /> control valve. This will allow the water levels in the two pools to be operated somewhat <br /> independently of each other. The preliminary design of the new pumping system <br /> incorporated the use of the three stainless steel vertical turbine pumps that were removed <br /> from the 629 Pump Station. If the pump bases are set at an elevation of 10893 feet <br /> (slightly above the maximum water level in the reservoir), then the minimum water level <br /> required for the pumps to operate is about elevation 10880 feet. This would be the <br /> minimum water level that could be maintained in the seepwater pond and reservoir. <br /> Considerable dredging and excavation would be required to lower the minimum level <br /> further. <br /> The pumping requirements for the new system were estimated based on the <br /> parameters listed above. Several pump configurations were evaluated. The results of this <br /> analysis indicate that the three 629 pumps could be modified to provide an adequate <br /> pumping capacity to fulfill all of the required operating criteria discussed previously in this <br /> report. The approximate pump capacities would be as follows: <br /> One 629 Pump: 2,700 gpm <br /> Two 629 Pumps in parallel: 4,750 gpm <br /> Three 629 Pumps in parallel: 6,100 gpm <br /> The most critical design criteria in terms of maximum pumping capacity would be the <br /> control of the reservoir water level during a year that is hydrologically similar to 1984. <br /> Using the capacities listed above, three pumps would be required to operate in parallel for <br /> about one month during the peak of the runoff season. This is the only year of the study <br /> period that all three pumps were required to operate at the same time. Therefore, the third <br /> pump would be a spare in most years. The maximum water level in the reservoir during <br /> the 1984 simulation was approximately 10,887 feet (three feet below the top of the <br /> spillway gates). The assumed beginning water level in the reservoir and pond at the onset <br /> of the runoff season was elevation 10880 feet. <br /> 7 <br />