Penman's equation requires daily mean temperature, wind speed, air pressure, and solar radiation to predict E. Simpler Hydrometeorological equations continue to be used where obtaining such data is impractical, to give comparable results within specific contexts, e.g. humid vs arid climates.

FAO 56 Penman-Monteith equation (1998)

The Penman-Monteith equation refines weather based evapotranspiration (ET) estimates of vegetated

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