Soil loss due to runoff is a major and ongoing ecological problem worldwide. The quantity of eroded soil is significantly influenced by various factors, including land use and management practices, characteristics of torrential rainfall, soil properties, and topography. This paper presents the results of scale model tests on a 2:3 (V:H) slope constructed from a highly erodible sandy soil protected by different types of erosion-control geosynthetic materials (geomats). The slope models were subjected to intense rainfall using a rainfall simulator. Geomats have the potential to significantly reduce soil loss and enhance the shallow stability of slopes. The amount of eroded material was estimated for all slopes (protected and unprotected by geomats) by generating time-variation graphs of soil erosion while a torrential rainfall rate of 144 mm/h was applied for different periods of time.