Simplified versions for the Penman evaporation equation using routine weather data

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Simplified Reference Evapotranspiration Formula Using an Empirical Impact Factor for Penman’s Aerodynamic Term (2013, methodology): “Where no wind data are available, Valiantzas (2006) substituted the global average value of u 1⁄4 2 m=s in the previous formula, Eq.”
Evaluation of 13 Empirical Reference Potential Evapotranspiration Equations on the Island of Crete in Southern Greece (2011, background): “…scientific publications dealing with the topic exist and the comparisons made are limited to a small number of empirical equations (Alexandris and Kerkides 2003; Michalopoulou and Papaioannou 1991; Papadopoulou et al. 2003) or to the estimation of free-water surface evaporation (Valiantzas 2006).”
Crop Evapotranspiration (ET) Estimation Models: A Review and Discussion of the Applicability and Limitations of ET Methods (2015, background): “2.7.3 Valiantzas Model Valiantzas (2006) developed a set of equations to determine the ETo rate based on simplifications made to the Penman (1963) equation.”