Evapotranspiration (ET) (1) The process by which plants take in water through their roots and then give it off through the leaves as a by-product of respiration, the loss of water to the atmosphere from the earth’s surface by evaporation and by transpiration through plants. (2) The quantity of water transpired (given off), retained in plant tissues, and evaporated from plant tissues and surrounding soil surfaces. (3) The sum of Evaporation and Transpiration from a unit land area. (4) The combined processes by which water is transferred from the earth surface to the atmosphere, evaporation of liquid or solid water plus transpiration from plants. (5) The combined evaporative-type processes, including evaporation, interception, and transpiration, usually applied to biological systems. Evapotranspiration occurs through evaporation of water from the surface, evaporation from the capillary fringe of the groundwater table, and the transpiration of groundwater by plants (Phreatophytes) whose roots tap the capillary fringe of the groundwater table. The sum of evaporation plus transpiration.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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