The global erosive and sedimentary balances and its three ravines of geomorphological units between two successive levellings including 2019 and 2022, were indeed carried out and presented on the basis of LS MNT and LS Topography. Using the RUSLE model and topographic method, we proceeded to the description of the Funa watershed and the location of the ravines studied. The method of describing ravines involves the description of their geomorphological units, which requires the creation of a typology of forms, processes and factors of erosion and sedimentation within the ravines. Our descriptive method is complemented by a statistical analysis method to group the geomorphological units of the ravines according to the characteristics describing the processes and factors of erosion. Nearly 40% of the watershed surface is exposed to a soil loss rate of more than 25 tonnes per hectare per year, with an average of 45.8 tonnes per hectare per year across all watersheds in the study area. Indeed, the results show that the spatial distribution of soil loss zones classified as "high to critical" obeys specific conditions. According to the analyses, the characteristics of the areas most affected by this problem in the study area are those located on soils of a sandy nature, (Spolicsols). These terrains are usually found on medium slopes at an altitude of between 300 and 400 meters. However, the validity of these results is subject to debate, as these values may vary from one model to another depending on the methods adopted. Two scenarios were developed to determine the impact of these developments, and the results showed that the development of 16% of the watershed surface will reduce average erosion by more than 25%.