This study aims particularly to overcome the lack of rainfall measurements and to demonstrate the usefulness of open satellite data rainfall-erosivity estimation in Morocco. For this purpose, a short time series of two satellite products, namely CHIRPS (Climate Hazards Group InfraRed Precipitation with Station data) and TRMM (Tropical Rainfall Measuring Mission). were used and correlated to in-situ measurements of a period of 17 years (2000- 2016). This analysis revealed a relatively better correlation between monthly CHIRPS product and in-situ measurements. the coefficient of determination is arround 0.81. After its calibration using regression equations, this product were used to estimate the rainfall-erosivity over Morocco according to Renard and Freimund equation. The result showed a geographical disparity and an annually weak evolution of erosivity. Likewise, the study pointed out a significant difference in the estimated erosivity across seasons. This imply a reduction of 3% in summer and 15% in spring and a remarkable increase of 33% in autumn and 39% in winter. The prominent change of the seasonality of rainfall erosivity is very significant in the course of agricultural practices’ evolution and the adoption of adequate measures of soil protection.

Keywords: Erosion, erosivity, rainfall, modelling, CHIRPS, TRMM, Morocco