A Modelagem hidrológica como instrumental para a resiliência urbana

o caso da bacia do Ribeirão Lageado, São Paulo/ SP

Abstract

This paper addresses the problem of storm waters, flooding and landslides in the Ribeirão Lageado watershed, understanding these extreme events from a theoretical perspective of socio-environmental vulnerability, the social construction of risk, and urban resilience. It starts from the hypothesis that the construction of small parallel reservoirs located upstream of the critical points of the occurrence of extreme events would considerably mitigate their severity and intensity, thus indicating a feasible possibility of adaptation that must be taken into account by the competent authorities when planning future urban drainage actions in the region. The method used was the convolution of the SCS Unitary Hydrograph from upstream to downstream of the watershed, with twelve measurement points being defined for a quantitative verification of peak flow damping in two scenarios, without and with reservoirs. An innovative procedure for dividing the watershed was proposed, which allowed a detailed calculation for internal measurement points. The results validated the initial hypothesis, with a damping between 20% and 40% being observed in six points, and greater than 40% in five points, indicating a significant potential mitigation, as well as a desirable adaptation towards an urban resilience oriented to areas environmentally fragile.