Landuse changes and rainfall intensity from natural vegetation to cultivated fields both impact on river streamflows and sediment dynamics. Assessing the magnitude of these flow and sediment changes is important to water management. However, many rivers are still under-studied/monitored and data sparse. Fully distributed rainfall-runoff models, such as JAMS/J2000, allow for simulation of streamflow, its flow components and potential sediment yield given landuse and hydrological changes. This study demonstrates the use of this method in the Bot River, a data-scarce catchment in South Africa. A hydrological model was implemented, and sediment yield was estimated under three landuse and two hydrological flow component scenarios. The model reported Nash-Sutcliffe efficiencies (E2) of 0.64 and 0.32 (for streamflow) for model calibration and validation periods, respectively. Modelled mean annual sediment yield increased from 423 t/km2/yr in 1990 to 490 t/km2/yr in 2018, attributable to landuse changes.