Impacto da impermeabilização na hidrologia de uma bacia urbana

• Autor(a) principal: Mesquita, Janine Brandão de Farias
• Data de Publicação: 2020
• Outros Autores: Lima Neto, Iran Eduardo
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/55064
• topic: Impermeabilização; Hidrograma; SWMM

Changes in land use are important factors in the urbanization process. This study aimed to analyze the impact of waterproofing in an urban watershed, located in Fortaleza, Ceará. The Storm Water Management Model (SWMM) hydrological-hydraulic model was used. A 20-year time series of pluviometric data was analyzed in order to select three maximum rainfalls with a return coefficient of 5, 10 and 50 years and three distinct years: with below-average rainfall (2013), typical (2018) and above the average (2019). Subsequently, scenarios of the impact of waterproofing on hydrology were analyzed, considering waterproofing of 30%, 57% (current) and 90%. These were analyzed for maximum rainfall and for three selected years. The results showed that for rains of great magnitude, a 20% decrease in waterproofing would reduce a maximum of 12% of the basin's peak flow. An increase of around 30% in waterproofing, on the other hand, would not alter the peak flow. Analyzing scenarios for 2013, 2018 and 2019, it was found that the less rainy the year, the greater the influence of waterproofing to increase the average annual flow of the basin. It was concluded that the basin is already in a critical stage of maximum waterproofing capacity.