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. The Oueme watersheds at Beterou and Bonou has been recently facing increased sensitivity to extreme hydroclimatic phenomena that occurred by flooding or drought events. In the same time, the population growth and the relatedsocio-economic activities increased the pressure state on water resources.In this context, hydrological modeling is an important issue and this studyaims at analyzing the calibration of the hydrological model GR4J based onPET Penman-Monteith and Oudin methods. Daily rainfall, Penman-Monteith andOudin evapotranspiration and daily data flow from the Beterou andBonou hydrometric stations on the Oueme Basin have been implementedin the GR4J model over the period 1971 to 2010. Oudin PET values areslightly higher than the Penman-Monteith PET ones. However, the differencebetween the two PET methods have only few impacts on the optimization andperformance criteria of the GR4J model. The Nash values ranges from 0.83 to0.91 in Bonou, and 0.52 to 0.70 in Beterou for the calibration indry period, while in validation, they are 0.59 to 0.78 in Beterou,and 0.56 to 0.88 in Bonou in wet season. In view of these results, with thetwo PET methods used which do not result from the same climatic variables,it should be said that the formulation of PET has only few impacts on theresults of GR4J for these tropical basins.

proceedings of iahs

Calibration of the hydrological model GR4J from potential evapotranspiration estimates by the Penman-Monteith and Oudin methods in the Ouémé watershed (West Africa)