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Transcription
70. expected by the Department of the Interior to fall within these limits. Also, for a period of at least seven months each year, the elevation of the lake has been below 1 ,200. Because of this great fluctuation in water level, pumps must be set below the low water elevation, or at approximately Elevation 1,120. Motors and controls must be set above maximum water elevation or at about Elevation 1,230. An intake to meet these requirements can be provided by locating precipitous slopes on Lake Mead and cantilevering an intake structure over the lake. Deep well turbine pumps located at the outboard end of the structure, with the pump columns projecting to Elevation 1,120 will be required. A structure of this type was provided for the intake on the BMI system. Intake structures as described above can be located at various points on Lake Mead. Two locations and pertinent features of the intakes are shown on Figures 19 and 20. Because intakes as shown and described above have been successful 6n Lake Mead, they are used herein for purposes of the computation of project costs. However, additional studies should be conducted at the time of design to ascertain the economic feasibility of providing a tunnel type or a well type intake. Detail geology of the areas will be required for these studies.
