Implementation and Validation of a Green Infrastructure: Detention Basin to control water surface - A Case Study
Green infrastructure; Detention basin; Surface runoff; Hydrological modeling; Stormwater management.
Green infrastructure refers to engineered solutions that mitigate and control the problems caused by excess stormwater from impervious urban surfaces to reduce urban flooding. Detention basins designed to control the quantity and quality of stormwater constitute one of these green infrastructures. This research was developed to install, validate, and evaluate the hydrologic performance of a detention basin designed at the research station of the Federal Rural University of Pernambuco (UFRPE). The local pluviometry was established from data obtained jointly with the Pernambuco Water and Climate Agency (APAC), and the missing data were filled using linear and multiple regressions. A rainfall-runoff model for 30-minute events showed a high correlation between 24-hour precipitation and inflow in the detention basin designed by the Rational method, with a determination coefficient of 0.9978. The volumetric method applied demonstrated high hydrological efficiency, controlling inflows and outflows from the detention basin. However, the volumetric method performs better for long-duration events up to 60 minutes. The detention basin installed attenuated the hydrograph and extended detention time, proving to be an efficient green infrastructure for in situ stormwater control and a green tool to make cities more resilient.