GPM-IMERG product: a new way to assess the climate change impact on water resources in a Moroccan semi-arid basin

Abstract Due to the lack of observed data, climate change impact studies are difficult conduct. This paper evaluates effect on water resources, in a Moroccan basin, using Final Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (GPM-IMERG-F) precipitation and European Reanalysis fifth generation (ERA5) evapotranspiration. The two-parameter monthly model Rural Engineering (GR2M) is calibrated validated ground-based GPM products, ERA5 temperature uncorrected corrected discharge intake data. Five regional models used assess future changes during period 2025–2060. results show that hydrological able simulate surface runoff. same obtained satellite data reanalysis product which remain, respectively, source cases ungauged or poorly gauged watersheds. assessment shows an increase accompanied by decrease precipitation. These would lead runoff ranging from ?1 ?45% based GPM-IMERG study presents alternative evaluating resources.