• Precipitations appear to be the most important meteorological variable that impacts hydrology in general, and yet they are poorly measured on a global scale because of the low density of ground-level measurement stations. • In Morocco, the Bouregreg-Chaouia watershed faces significant challenges in water resource management, driven by the spatiotemporal irregularity of precipitation and the limited number of climate stations. • This irregularity, combined with the lack of precise meteorological data, complicates hydrological and hydraulic modeling and restricts effective management decisions.
• Satellite-derived precipitation products, such as PERSIANN-CCS, offer a promising solution to address these data gaps. They provide essential complementary data to enhance hydrological models, especially in areas lacking measurement stations.