Urban Flooding: A Case Study in SWMM in ``Lagoa Do Sapo`` in Batayporã – MS

Abstract

In recent years, society has experienced more intense and recurring extreme hydrological precipitation events. The study area presents several flood events in its past and present. The rainfall event that occurred on October 12, 2022, reached a height of 120mm, triggering a flood scenario that caused significant commotion among residents. ``Lagoa do Sapo`` presents a relief susceptible to the occurrence of this flood, as it is located in a topographic depression, where all surface runoff is directed to the lagoon site. The present study aims to explore the extent of flooding in the city through 5 precipitation scenarios, seeking to provide decision makers with pertinent information to address the problem in the city. The software adopted was the Storm Water Management Model (SWMM), the model calibration was based on a simplified methodology using two approaches, the first consists of comparing the simulated flood spot with the photographic records of the event and the second in an own program parameter, continuity error, this approach was adopted due to the lack of data collected during the flood event. With the calibrated model, it was possible to estimate the number of affected residences and flood areas for the different scenarios. Based on the results of this work, it is concluded that the ``Lagoa do Sapo`` region needs hydraulic interventions in its drainage system to delay surface runoff and increase the capacity of the existing overflow.