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Show In 1935 the ASCE Special Committee of the Board of Direction, on Irrigation Hydraulics, adopted the following definitions:8 "Consumptive Use: The quantity of water transpired and evaporated from a cropped area." "Evapo-transpiration: Combined loss of water from soils by evaporation and plant transpiration." In some reports, the term "total evaporation" is applied to the combined evaporation and transpiration loss in drainage basins.9 The handbook10 of the ASCE Committee on Hydrology of the Hydraulics Division of the American Society of Civil Engineers, published in 1949, states: "* * * the terms 'evapo-transpiration' and 'consumptive use' have received general acceptance, these terms denote the quantity of water transpired by plants during their growth or retained in the plant tissue, plus the moisture evaporated from the surface of the soil and the vegetation, expressed in feet or inches depth of water or used in a specified time." The definitions of other terms which are sometimes confused with consumptive use are as follows: 1. Duty of water: The quantity of irrigation water applied to a given area for the purpose of maturing its crop; 8"Letter Symbols and Glossary for Hydraulics," by the Special Committee for Irrigation Hydraulics, ASCE, Bulletin No. 11, 1935. 9"Hydrology," Physics of the Earth Series, Vol. IX, ed. by O. E. Meinzer, McGraw-Hill Book Co., Inc., New York, N. Y., 1942, p. 314. 10"Evaporation and Transpiration," in Hydrology Handbook, Manuals of Engineering Practices, No. 28, Hydrology Committee of Hydraulics Division, ASCE, 1949, Chapter 4. |
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Original book: [State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants, United States of America, State of Nevada, State of New Mexico, State of Utah, interveners] : California exhibits. |