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Reference evapotranspiration ( ET o) is an essential parameter of the hydrologic cycle that plays a key role in the water resources management, especially in arid and semi-arid regions where the total amount of annual precipitation is low. Accurate information on  ET ovalues would be essential for irrigation scheduling and water resources planning as well as water allocation policies. Due to the difficulties involved in the precise direct measuring of this parameter, indirect methods should be adopted and validated in different data completeness scenarios. Although local estimation of  ET ousing indirect methods is a way to achieve reliable estimations of this parameter, assessing external/regional scenarios for evaluating these methods would be necessary, since lots of regions suffer from the lack of necessary meteorological records for the  ET oestimation. The present paper evaluated different spatial (external) data management scenarios for adopting the most commonly used empirical equations under ancillary data supplanting in semi-arid regions. The obtained results revealed that when designed properly, the external data supplying structure for  ET oestimations in a target point would be a suitable way to obtain reliable estimates.

ish journal of hydraulic engineering

Adopting regional calibration scenarios for ensuring reliable  ET o                   estimates in semi-arid regions: assessing the ancillary data supply method