Análise Multicritério de Potencialidade Erosiva em Exutórios de Redes de Drenagem Pluvial

Abstract

The analysis of the literature on sanitation shows that studies on stormwater drainage are less frequent when compared to those focused on the analysis of drinking water supply systems, sewage systems and solid waste management. Despite this, Brazil suffers annually from floods in urban centers, which in addition to financial losses, cause serious social, environmental and public health impacts, demonstrating the need for studies and investments in the sector. Also considering the need to conserve water bodies, this study is aligned with the current demands for improvements in urban planning, especially in sanitation infrastructure. Thus, the main proposal of the work developed is to create a method for analyzing the potential for erosion caused by stormwater, more specifically that originating from drainage networks without energy dissipation. To this end, some concepts of stormwater drainage are initially presented, in addition to a diagnosis of the problems related to this infrastructure. The methodology proposes the association of four factors related to erosion growth: the flow rate drained by the network, the type of soil in which the discharge is located, the difference in elevation between the discharge and the water body, and the time since the erosion began. In the end, the multicriteria analysis developed presented satisfactory results, with Pearson Correlation Coefficient values greater than 0.90, indicating a very strong correlation between the values obtained by the method and those observed in the field. For these scenarios, it was possible to identify that erosion growth is mainly influenced by the flow rate drained by the drainage network and the difference in elevation between the discharge point and the receiving body.