Análise da Implantação de Reservatórios de Detenção em Lotes Urbanos

Analysis of the Implementation of Detention Tanks in Urban Lots

Abstract

The waterproofing of watersheds increases surface runoff and reduces water infiltration into the soil. In this context, floods occur with greater frequencies and magnitudes, causing economic losses, pollution, health problems, traffic interruptions and human losses. This work aimed to analyze flood damping through detention reservoirs in urban lots installed in the city of Crato, Ceará, Brazil. An urban drainage system was designed and simulations were carried out in SWMM. From scenarios without the presence of the LID structure and with detention reservoirs, the peak flow of sub-basins, peak flow and water depths in the galleries, peak flow and volume drained in the system's outfalls were evaluated. The results showed that the detention reservoirs were able to reduce the peak flow in the sub-basins and galleries on average with maximum values of 83% and 71%, respectively, and 52% of the maximum relative water depth in the galleries. The volume drained and peak flow in the outfalls had maximum reductions of 68% and 69%, respectively. Therefore, the installation of these structures enabled better management of the water balance of the river basin, with a predicted reduction in flood occurrences.