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This paper describes a work done in the Itaim watershed at Taubate, SP, and had the objective of estimating the surface runoff based on the Curve-Number (CN) method in area with vegetation cover of grassland (Brachiaria Decumbens), that prevails in this watershed. The surface runoff was estimated using three different methods: 1 st ) values of accumulated Infiltration (IAc) obtained in the field were used, considered as the Potential Infiltration (S), which varied from 15.37 mm to 51.88 mm with an average value of 23.46 mm. With those measured infiltration rates and using the maximum precipitation values for Taubate, SP, with duration time of 3 hours: P = 54.4; 70.3; 80.8; 86.7; 90.9; 94.1 and 103.9 mm, respectively, for the return times, Tr = 2, 5, 10, 15, 25, 50 and 100 years, the following values of surface runoff were generated: 34.83; 49.33; 59.14; 64.71; 68.69; 71.73 and 81.10 mm, respectively; In the 2 nd method it was considered that the prevailing vegetation cover of the watershed was

Escoamento superficial na bacia hidrográfica do Ribeirão Itaim