Woodward, Sherman M. (Sherman Melville), 1871-, Okey, Charles W. (Charles William), 1886-, United States. Office of Experiment Stations · Washington, D.C. : U.S. Dept. of Agriculture · leaf 59
^4 … £.e*37 / t\>-rr?cur>c/P/7ej lL.j\«__J ! £fev.23 Fig 2.—Plan and elevation of pumping plant, Louisa-Des Moines Drainage District No. 4, Iowa. charge pipe through the levee above high water and then down, withits end opening below low-water line, so as to secure a water seal.This is necessary…
Drainage · Pumping machinery
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