Aplicação do modelo hidrológico SWMM na avaliação da efetividade da rede de microdrenagem em uma sub-bacia do município de Guaporé/RS

Abstract

Cities with a history of flooding can experience negative consequences, such as loss of belongings, health problems, and lack of urban planning. Guaporé is a city located in the northeastern part of Rio Grande do Sul, Brazil, and has a history of urban flooding, as evidenced by the Municipal Solid Waste Management Plan (PMSB) and Urban Development Master Plan (PMDU). Thus, the objective of this study is to assess the effectiveness of the microdrainage network through hydrological modeling using the SWMM software in a sub-basin of Guaporé/RS. The modeling was conducted for the existing microdrainage network, comprising 213 links, 214 nodes, and 41 contributing basins, for different return periods. Due to data inconsistencies, some network directions and changes in slope had to be made. The modeling was performed for return periods of 2, 5, and 10 years, resulting in 26, 33, and 35 flooding points, respectively, and some sections with speeds exceeding 4 m/s. For locations where these events occurred, improvement proposals were suggested, including replacing the pipes with larger diameter ones and/or altering the slope of the network. In total, 164 modifications were made based on the modeling results for a 10-year return period, now indicating 4 flooded points and about 30% of sections with speeds exceeding 4 m/s. However, the network needs to be reviewed due to the use of topography data with limited accuracy and the lack of updated records of the municipality's networks. [resumo fornecido pelo autor]