Abstract: This study reflects the use of the Erosion Potential Method (EPM) embedded in the Intensity of Erosion and Outflow model (IntErO) in the River basin of ArbaaAyacha, as a first application in the Moroccan territory to show its reliability for the estimation of the soil losses in the grounds and the streaming. This model required for first a mapping of the factors of hydric erosion, such as the land use, the type of ground, the lithology, the topography and the climatic and meteorological distribution of the data. The integration of the restart of this steep in the IntErOmodel allows the evaluation and the calculation of the streaming and the contribution of sediment in the studied area. The obtained result shows that the value of the Coefficient of the river basin erosion Z is 0.694, this value indicates that the river basin belongs to an III destruction category. The strength of the erosion process is medium, and according to the erosion type, it is mixed erosion. The maximal outflow from the river basin Qmax was predicted in 113.72 m³s-1, (incidence of 100 years). Finally the Real soil losses per km2 are estimated to 228.94 m³ km-² year and this value indicates, according to Gavrilovic, that the river basin belongs to the V category. This study has shown that IntErO model can be a useful tool for researchers in the calculation of runoff and sediment yield at the river basins level in the Western Rif of Morocco.