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Image from page 182 of “Journal of electricity” (1917)

Image from page 182 of

Identifier: journalofele381151917sanf
Title: Journal of electricity
Year: 1917 (1910s)
Authors:
Subjects: Electrical engineering Electricity Gas manufacture and works
Publisher: San Francisco : Technical Pub. Co.
Contributing Library: San Francisco Public Library
Digitizing Sponsor: California State Library Califa/LSTA Grant

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Text Appearing Before Image:
t. i Chemi-Hydrometry—Bonj. F. Groat. Proc. A. S. C. E. Vol. XLI. No. 9p 2111. Also Kents Engineers Handbook. THE ECONOMICS OF PUMP IRRIGATION A study of the economics of pump irrigation hasbeen made by the agricultural experiment station atTucson, Arizona. The influence of acreage upon thecost of pumping is forcefully shown in the diagramgiven herewith which is taken from the twenty-sixthannual report of the station and which has just madeits appearance. From this chart it is seen that pump-ing plants should be used continuously through theirrigating season and that a five inch centrifugal pumpshould supply water for at least 80 acres. An Irrigation Laboratory Well The University of Arizona has dug a pit to waterlevel and installed a 16-inch stave pipe casing 200 ft.deeper in order to get experimental data on electricalpumping for irrigation. Tests are to be made on ver-tical pumps and much important data is expectedleading to further economic uses of the electric pump. 25 20 15 10

Text Appearing After Image:
ASSUMPTIONS 5 IN. CENTRIFUGAL PUMP4 FT. DEPTH OF IRRIGATION PER YEARCOST OF GAS OIL AT THE RANCH 6$ PER GAL.COST OF ELECTRIC POWER 2.5<|: PER KW.H.(THISPRICE IS POSSIBLE FOR LARGE PROJECTS ONLY] O 20 40 eo 80 IOO AREA IRRIGATED IN ACRES Cost Data on Pump Operation 120 time fully 50 per cent of the water pumped for irri-gation in southern Arizona passes through pitlesspumps. For several years the pumps of this typewere brought into Arizona from Texas and inefficiency they did not measure up to that of the betterclass of pit pumps with which they came in compe-

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