Blaney-Criddle equation

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The Blaney-Cridle equation is a method for estimating reference crop evapotranspiration :

ET0 = p ·(0.46·Tmean + 8)

Where:

ET0 is the reference evapotranspiration [mm day-1 ] (monthly)

Tmean is the mean daily temperature [°C] given as Tmean = (Tmax + Tmin )/ 2

p is the mean daily percentage of annual daytime hours.