Participation in the research sub-project developed by researcher Dr. Jorge Marcos de Moraes, do Isotopic Ecology Laboratory (CENA/USP). The main objective of the project will be to carry out an integrated study of hydrology and nitrogen dynamics, in three paired basins, one with forest cover, another with pasture cover and the last with eucalyptus. In this project I will be responsible for structuring the cartographic database of the study area and hydrological modeling of the studied microbasins.