Avaliação do sistema fluvial urbano de Chapecó/SC através do Protocolo de Avaliação Rápida de Rios Urbanos (PARU)

Abstract

The expansion of urbanization and population growth have brought challenges to the management of municipalities due to irregular occupations, especially those close to rivers. This process of city growth promotes changes in the environment, and in this case, from changes in the use of land in river basins, as well as directly on water courses. In this sense, the rivers that drain urban areas have their natural processes and dynamics affected by several variables, which directly and indirectly modify the ecosystem as a whole. Faced with this problem, this work aims to analyze the current state of urban rivers in the city of Chapecó/SC through the application of the Urban River Assessment Protocol (PARU). 100 points were defined for the application of PARU distributed in different points of rivers located in the urban hydrographic basins of the city of Chapecó. As it is a qualitative-quantitative protocol, the results obtained were presented in this work, according to the classification into: terrible, ruinous, regular, good and excellent, considering the score obtained in the PARU. In this regard, it was necessary to adapt the classification formulated by Campos and Nucci in 2021, adjusting the score and including an additional class so that the final results were better adapted to the local reality. The results obtained show that classes such as terrible and bad are located in areas with greater urbanization intensity, where there are very old anthropogenic changes. The points considered optimal were found in peri-urban areas or close to springs, thus showing that there is greater naturalness in these places. Analyzing the general result, it is observed that the most found classes were regular or good, demonstrating that the city's drainage network, although it presents modifications induced by human action, still preserves characteristics that place it in a satisfactory condition. Furthermore, through these results it was possible to observe direct and indirect changes in the city's urban rivers and also analyze possible suggestions for improvements in river basin management.