. Soils, their properties and management. Soils. lEEIGATIOy AND DRT-FAEMING 707 terms because of their definiteness and relation to the common method of stating rainfall. Usually an inch or a foot of water refers to that depth over an acre. Various mechanisms are employed for measuring^ water in irrigation practice. The commonest of these are the weir and the flume. (See Fig. 81.) The weir is. Fig. 81.—Plank raeasurmg box and a Cippoletti weir used in determin- ing the flow of irrigation water. a simple device to give the stream a definite cross section and to aid in the measurement of the dep
. Soils, their properties and management. Soils. lEEIGATIOy AND DRT-FAEMING 707 terms because of their definiteness and relation to the common method of stating rainfall. Usually an inch or a foot of water refers to that depth over an acre. Various mechanisms are employed for measuring^ water in irrigation practice. The commonest of these are the weir and the flume. (See Fig. 81.) The weir is. Fig. 81.—Plank raeasurmg box and a Cippoletti weir used in determin- ing the flow of irrigation water. a simple device to give the stream a definite cross section and to aid in the measurement of the depth, and there- fore the volume of flow. It is usually a knife-edged notch, of a standard shape calibrated to a grade stake a short distance up stream from which the depth of water and its velocity are rated. The measuring box, frequently termed a module, is a box for measuring the flow of water from an orifice under fixed conditions. The Staldate module, developed in Italy, is most generally adopted for the purpose. Small streams are divided by a knife-edge 1 Carpenter, L. C. The Measurement and Division of Water. Colorado Agr. Exp. Sta., Bui. No. 150, 4tli ed. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyon, T. L. (Thomas Lyttleton), 1869-1938; Fippin, Elmer O. (Elmer Otterbein), 1879-1949; Buckman, Harry Oliver, 1883-. New York, Macmillan
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Keywords: ., bookauthorlyontlth, bookcentury1900, bookdecade1910, bookyear1915
