High Quality Content by WIKIPEDIA articles! The Blaney-Cridle equation is a method for estimating reference crop evapotranspiration.The Blaney-Cridle equation is a relatively simplistic method for calculating evapotranspiration. When sufficient meteorological data is available the Penman-Monteith equation is usually preferred. The Blaney-Cridle equation is however ideal when only air temperature data is available for a site. Given the coarse accuracy of the Blaney-Cridle equation it is recommended that it is used to calculate evapotranspiration for periods of one month or greater. The equation calculates evapotranspiration for a 'reference crop', which is taken as actively growing green grass of 8–15 cm height.

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