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reference evapotranspiration

Owned by Dennis Daggett (Deactivated)
2018-02-16
1 min read

The evapotranspiration from a dense, well-watered hypothetical crop with specified height, albedo, and surface resistance. The ASCE Standardized Reference Evapotranspiration Equation recognizes two reference surfaces: short crop reference ET (Eto) which represents a clipped, cool-season grass (this is equivalent to FAO 56 reference ET) and a tall crop reference (ETr) wich represents alfalfa. Reference ET is a measure of the atmospheric demand for water and is used in conjunction with a crop coefficient to estimate crop ET.

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