Ranking of Empirical Evapotranspiration Models in Different Climate Zones of Pakistan

Accurate estimation of evapotranspiration (ET) is vital for water resource development, planning and management, particularly in the present global warming context. A large number empirical ET models have been developed estimating ET. The main limitations this method are that it requires several meteorological variables an extensive data span to comprehend pattern accurately, which not available most developing countries. efficiency 30 has evaluated study rank them Pakistan facilitate selection suitable according availability. Princeton Global Meteorological Forcing daily climate with a 0.25° × resolution 1948–2016 were utilized. estimated using Penman–Monteith (PM) was considered as reference. Multi-criteria group decision making (MCGDM) used Pakistan. results showed temperature-based Hamon best model Pakistan, followed by Hargreaves–Samani Penman models. also performance terms different statistical metrics mean bias (PBias) −50.2%, error (ME) −1.62 mm correlation coefficient (R2) 0.65. Ivan among humidity-based models, Irmak-RS Ritch radiation-based mass transfer-based Northern heterogeneous region relative