Drainage of the Água dos Brancos and Moenda Velha stream basins to the Capão Redondo detention reservoir

Simulation of its capacity and the support of green drainage infrastructures

Abstract

The intensification of urbanization in Brazil, combined with the effects of climate change, has increased urban vulnerability, especially in marginalized communities. In this context, the concept of sustainability has gained prominence, with an emphasis on Nature-Based Solutions, such as green drainage infrastructures, which contribute to flood control and environmental recovery. This study qualitatively analyzes the potential for urban surface runoff in the sub-basins of the Água dos Brancos and Moenda Velha streams, located in the Capão Redondo district, a peripheral area characterized by precarious infrastructure that culminates in the Capão Redondo reservoir (piscinão), a project currently under construction, as well as the potential contribution of green drainage infrastructures along the basins in mitigating flooding. The main methodological procedure, following the literature review, was the simulation of basin behavior during rainfall events, both with and without drainage infrastructures, using a topography and rainfall simulator. The results showed that the green infrastructures distributed across the basins significantly reduce the impact of rainfall on the reservoir located at the basin outlets.