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Transcription
63. the maximum rate of flow (without the use of the booster pumps) is limited to about 15.0 MOD. At this rate of flow the residual pressure on the feeder mains at their junctions with the distribution system is 25 psi. If 15.0 MOD is considered the maximum hourly rate of flow, then the average hour (or average day) is limited to 10.6 MOD. Since this agrees with the safe production of the artesian wells, it Is used for the average rate of flow from the wells. Dally rates in excess of this figure can be supplied by using the booster pumps and the Lake Mead system. Estimated maximum rates of flow and the storage necessary to sustain these rates of flow are shown in Table 9. Table 9 shows that the proposed arrangement makes maximum use of existing facilities. Operating storage was defined as the storage necessary to compensate for hourly variations in flow. Operating storage can be entirely elevated, with pumping equipment selected to pump at the average hourly rate of flow during the maximum day, or pumping equipment with greater capacity can be selected and the operating storage can be contained in elevated tanks andground level reservoirs. The following tabulation, for the usage of Lake Mead water during the maximum day in the urban area, 1970, shows the amounts of elevated storage required for various pumping rates:
