Before revision: Penman's equation requires daily mean temperature, wind speed, relative humidity , 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.
After revision: 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.