In this study, the performance of M5 model tree and conventional method for converting pan evaporation data (E<Subscript>p</Subscript>) to reference evapotranspiration (ET<Subscript>0</Subscript>) were assessed in semi-arid regions. Conventional method uses pan coefficient (K<Subscript>p</Subscript>) as a factor to convert E<Subscript>p</Subscript> to ET<Subscript>0</Subscript>. Two common K<Subscript>p</Subscript> equations for...</subscript></subscript></subscript></subscript></subscript></subscript>

Five reference evapotranspiration (ET<Subscript>0</Subscript>) equations are evaluated using data from seven humid locations. The equations evaluated include Hargreaves, Thornthwaite, Turc, Priestley–Taylor, and Jensen–Haise. The objective of this study is to evaluate ET<Subscript>0</Subscript> estimated by these equations against the...</subscript></subscript>