Caracterização da infiltração da água e escoamento superficial em áreas permeáveis urbanas

Abstract

The CN parameter value was determined by using rainfall simulator data in permeable urban areas. Two approaches and an alteration of initial abstraction were considered, so that it would be possible to analyze which of them is more accurate compared to standard values from the original method SCS Curve Number. Hence, 27 tests were carried out by using rainfall simulator in nine distinct locations under different types of soil and vegetation cover situations. Thus, SCS method assuming initial abstraction of λ=0,2 is more adequate than the other methods, for it demonstrates to be safer in estimating runoff in urban areas (necessary information concerning flood control). The rainfall simulator used allows the CN values calibration, and that can bring advances in feasibly and accurate simulation of CN method.