Factors to Consider in Selecting a Farm Irrigation System ...
2015-12-23u2002·u2002The most important factor in selecting an electric motor or internal combustion engine to supply irrigation water is horsepower. The equation for calculating required horsepower for pumping water is: Where: Q = system flow rate (gpm) H = total head in ft. (multiply psi by 2.31 to convert to ft.) E = operating efficiency of pump (as a decimal ...
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