The performances of five empirical models, namely: Hargreaves-Samani, Makkink [1], Makkink [2], Priestley-Taylor and FAO 56-PM in estimating reference evapotranspiration (REF-ET) were separately compared with Epan data and FAO 56-PM, respectively. The predictive perBased on statistical analysis, Hargreaves-Samani method compared best with daily and monthly Epan data, while Makkik2...