The phenomenon of erosion in river basins that have water infrastructure is a major problem in river basin management. Global climate change and high levels of change in watershed utilization that exceed their carrying capacity accelerate erosion and increase sedimentation. Modeling the effectiveness of bench terrace conservation by combining real-time rainfall data from satellites with erosion analysis using the MUSLE (Modified Universal Soil Loss Equation) method is expected to yield an appropriate model to reduce erosion rates. This research is novelty in developing an integrated land conservation model utilizing Global Precipitation Measurement (GPM) satellite rainfall data as the primary source of hydrological input for reservoir catchments. Unlike other studies, which generally rely on spatially limited station-based rainfall data, this study integrates GPM-based MUSLE results with a bench terrace conservation scenario to evaluate the effectiveness of conservation measures under spatially and temporally variable rainfall conditions. The results of the analysis show that the erosion rate reached 403.930 tons/year in a catchment area of 3325 hectares, indicating a fairly high level of erosion. The application of the open bench terrace conservation method can reduce erosion by 4.02% of the total area of the watershed, with the mechanism of reducing surface flow velocity, increasing infiltration capacity, and retaining soil particles. Modeling conservation practices using the terrace bench method can control erosion and is a crucial step in sustainable watershed management. Therefore, integrating erosion modeling and soil conservation practices is necessary to maintain environmental stability and extend the lifespan of water resource infrastructure within the watershed.