Dimensionamento de bacias de detenção das águas pluviais com base no método racional em condomínio urbano

Abstract

Urban growth has intensified environmental impacts, especially due to the expansion of impervious areas, which increases the occurrence of floods and accelerates surface runoff. This study aimed to design a detention reservoir for stormwater management in a hypothetical urban condominium located in Goiânia (GO), using the Rational Method. The analysis considered hydrological variables such as return period, time of concentration, rainfall intensity, and runoff coefficient, along with local climatic and soil data. Two reservoir models were proposed—closed and open—with an estimated volume of 2,995.20 m³. Based on the SINAPI cost database (April 2025), a comparative analysis was conducted on construction and maintenance costs for both alternatives. The open reservoir showed lower implementation costs and greater potential for multifunctional land use, while the closed option demonstrated longer durability and reduced maintenance frequency. The study concluded that both alternatives are technically feasible, with the open reservoir being more suitable for urban areas with available space. Additionally, the adoption of detention solutions proved to be effective in mitigating flood-related damages, contributing to more efficient and sustainable stormwater management in urban settings.