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Show PROBLEMS. OF IMPERIAL VALLEY AND VICINITY. 87 Cost per acre. Imperial irrigation district, 515,000 acres................................... $40. 50 New United States lands, 274,400 acres.................................... SO. 90 Mexican lands, 30,000 acres............................................... 62.10 Exhibit A. Department of the Interior, United States Reclamation Service, Denver, Colo., January 14, 1921. From: Chief Engineer. To: Project manager, Yuma, Ariz. Subject: Pumping (Station, Imperial Valley-Imperial Valley investigations. 1. There is given herewith the estimated construction cost of three pumping plants in connection with the Imperial Valley investigations, as requested in your letter of December 22, 1920. The data on which these estimates were based are given in the following table. 2. These estimates are based on the following assumptions: Location, plants placed on the banks of canals, similar to the design of the B lift pumping plant for the Yuma auxiliary project. Buildings, reinforced concrete, plaiirwalls. Transformers, 33,000/22,000 volts. Motors, 2,200-volt, 3-phase, 60-cycle synchronous motors. Pumps, vertical centrifugal. 3. The cost of discharge pipes and transmission lines is not included in this estimate. F. E. Weymouth. Note.-The Indio plant shown in the following table was first considered, but it developed from the survey that there is so little arable land above the gravity line the plan was abandoned. It is possible, however, to install several small pumping plants in the Coachella Valley.-C. C. F., 3-4-21. Pumping plants-Imperial Valley investigations. Plant. Capacity. Static lift. Total lift assumed. Total horsepower required. Number units. Size motors (horsepower). Size pumps. Specific speed. Pump speed. Pump capacity. East Mesa.........'.. Sec.-ft. 388 270 118 30 132 55 31.0 136.0 57.0 1,750 5,350 980 3 4 2 600 1,400 500 Inches. 54 36 30 261 126 169 360 600 450 Sec.Jt. 130 69 58 West Mesa.. Indio..... Estimated cost. East Mesa. Size. Cost. West Mesa. Size. Cost. Indio. Size. Cost Preparatory work.................. Building and foundations.......... Machinery: Motors_____.¦.................. Pumps......................... Transformers............¦-...... Switching apparatus........t.. Motor generator exciter sets___ Miscellaneous machinery....... Miscellaneous material......___ Gate valves.................... Manifold^.............v........ Intake gates.........'.*..'....... Freight and hauling............ Labor installing................, Testing plant____\......... S witch yard......................... 3-600 h'. p.. 3-54"...:... 7-333 Kv-a. 2-37JKv-a.. $3,000 40,000 24,000 24:000 15,000 7,000 4,000 5,000 5,000 4-1,400 h. p. 4-36"....... 7-900 Kv-a. 2-15-Kv-a.. 6,300 2,400 1,800 $4,000 60,000 60,000 36,000 45,000 10,000 7,000 7,000 6,000 2-500 h. p... 2-30"........ 7-200 Kv-a.. 2-25 Kv-a... 4,000 9,000 500 2,700 7,000 3,000 2,400 5,000 12,000 600 3,000 Total estimated field cost..... Contingencies, 10 per cent.........., Administration and engineering, 15 per cent. Grand total estimated cost.. 153,700 15,300 22,000 268,000 26,800 40,200 $20,000 25,000 15,000 9,600 9,200 4,000 3,000 4,000 3,000 3,500 1,200 1,000 2,700 6,000 300 1,800 91,300 9,100 13,600 191,000 .........,.,..336,000 114,000 |