Reply To: PET equations

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E-HYPE and Lisflood are estimating evapotranspiration with the equation of Hargreaves and Samani (1985). In this equation radiation is
set equal to extraterrestrial radiation multiplied by a term representing atmospheric radiative transfer, which is parameterised as a function of daily maximum and minimum temperature

For VIC Evapotranspiration is calculated based on the Penman-Monteith equation