Impermeability Control in Land Use for Reducing Investments in Structural Flood Control Measures—Case of Pirajuçara Watershed, São Paulo, Brazil

São Paulo metropolitan region, like other megacities, has a high index of impervious areas which impacts its hydrology. In the summer, this region is devastated by heavy rainfall events. The main impact of this is the runoff volume produced leading to flash floods, mainly in small basins. Structural flood control measures can be costly, thus, the search for alternatives that mitigate those impacts become relevant for improving the protection, safety, and mobility of the population in the city, during and afterwards the occurrence of rainfall events. In this context, this paper presents some proposals to control the increase of impervious areas. The case study is the Pirajuçara River Basin, which has high potential for preservation and expansion of green areas. The study presents two scenarios: one follows the present condition (Scenario I), the other presents a proposal to control the expansion of impervious rate (Scenario II), following the limits fixed by the present Land Use and Occupation Law. Results show the advantages of the Scenario II in terms of cost and environmental benefits to São Paulo.

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