The use of models to the quantification of sediments production and consequent particles drag in hydrographic basins is very important to the professionals of the field of environmental management and planning. The model results can be used to diagnosis of situation and a hydrographic basin contamination, serving as a fundamental tool to take control and/or protection measures. The sediments created by erosion processes can drag the animals dejects usually used as fertilizers, reaching the superficial waters through the superficial running out phenomenon as well the table waters through the lixiviation phenomenon. In this context, we apply the hydrosedimentological model AVSWAT (Arc View Soil and Water Assessment Tool) to the Hydrographic Micro-basin of Rio Bonito (Descalvado - SP), aiming to evaluate the nitrogen (N) and phosphorus (P) entry on the springs. The results were promising according to some evaluated parameters.
Model simulation; nitrogen; phosphorus; AVSWAT
