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ET Estimation Methods <br />•SCS Blaney-Criddle method (TR-21): ETp estimation method based <br />on air temperature, day length, and crop and climatic coefficients. <br /> <br />•Penman-Monteith “Combination” equation: ET estimation method <br />based on temperature, relative humidity, solar radiation, and wind speed. <br /> <br />•ASCE Standardized P-M equation: Standardized method to calculate <br />ETref for a short (grass) and tall (alfalfa) reference surfaces (ASCE <br />2005). <br /> <br />•FAO-56 Method: ETc estimation method based on P-M ETref and crop <br />coefficients, Kc (Allen et al. 1998) <br /> <br />•Surface Energy Balance: ETa estimation method based on energy <br />fluxes at the surface (net radiation, latent heat (ET), sensible heat, soil <br />heat). <br /> <br />•Water Balance: ETa measurement method based on water fluxes into <br />and out of a control volume.