Abstract
This work presents the results of the study carried out in the Córrego do Vaçununga basin, in the city of Luis Antônio, state of São Paulo, Brazil. Ninety percent of the basin is constituted of eolic sandstones of Botucatu Formation and sandy residual unconsolidated materials. These two geological materials constitute the main aquifer of the region. Laboratorial and in situ tests were performed to characterize the unconsolidated materials in terms of basic physical properties, potential infiltration, suction and hydraulic conductivity. Rainfall data were collected from January of 2,000 to December of 2,002 and twelve scenarios were defined considering the intensity and duration. The infiltration and overland flow rates were obtained according to Chu (1978) adaptation of the Green & Ampt (1911) model for transient rainfalls. Despite the high homogeneity in terms of texture of unconsolidated materials the infiltration and overland flow ratio depend on the uses and associated management techniques.
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