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A Few Definitions <br />•Evapotranspiration (ET): movement (flux) of water from a surface to <br />the atmosphere; includes evaporation, E, from the surface and <br />transpiration, T, through plant stomates. <br /> <br />•Actual ET (ETa): ET from a land surface (also Consumptive Use, CU) <br /> <br />•Crop ET (ETc): modeled (predicted) ET from a cropped land surface <br /> <br />•Potential ET (ETp): ET of a crop with non-limiting water (well-watered) <br /> <br />•Reference ET (ETref): ETp from a well-watered reference surface <br />(usually a 0.12 m grass surface (ETo) or a 0.5 m alfalfa crop (ETr)) <br />