Blaney-Criddle equation

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

ETSubscript text0 = p(0.46T Subscript textmean +8)

Where : ETSubscript text0 reference evapotranspiration [mm daySuperscript text-1 ] (monthly)

TSubscript textmean daily temperature [°C] TSuperscript textmean = (TSubscript textmax + TSubscript textmin )/ 2] p mean daily percentage of annual daytime hours

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