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The SWAT (Soil and Water Assessment Tool) model was applied to simulate the sediment yield for the Ribeirão dos Marins watershed, in Piracicaba, Brazil. The application of the model requires georeferenced input data, which were processed through an interface between the model and a Geographic Information System (GIS). The watershed was divided into different levels, regarding the number and the size of the sub-basins. The simulated sediment yields for the different levels were compared to the observed data of a gauge located in the watershed, using the Nash and Sutcliffe Coefficient (COE) and the deviation between the simulated and the measured data (Dv). The main conclusion was that the different levels affect the final result of the simulation. Key-words: sediment yield; river basin.

Efeito do Nível de Subdivisão em uma Bacia Hidrográfica na Simulação da Produção de Sedimentos