Análise qualitativa da água ao longo do Rio Vacacaí no Município de São Gabriel/RS

Abstract

The contamination of waterways by a range of changes decreases the availability of clean water and good quality worldwide, ensuring its quality is extremely important for the continuity of future generations. In this context, the environmental monitoring enters as a production tool, and accumulation of data, in order to provide relevant information about the quality of this feature. This work aims by monitoring the water quality in the Rio Vacacaí, in São Gabriel - RS, raise important data on limnological processes, which could form the basis for future environmental quality control projects in the region. The methodology was based on the literature of scientific studies and existing legislation; seven points were selected along the river, starting at the head until after the urban area, was evaluated eight parameters, and these electrical conductivity, color, turbidity, dissolved oxygen, pH, alkalinity, chloride and calcium; Data analysis for two tests was performed a Kruskal-Wallis variance and other conglomerates or clusters. In the results there was an increasing trend in the values of the parameters as they approached the urban area. As the results, it is considered the main contamination diffusely as there are increased concentration over the course of water and this remains in flood periods. Furthermore, contamination due to discharge of sewage in the urban area becomes evident when we observe the gradual increase in color concentration and turbidity, as well as the pH increase at points along the urban area. Not to present extraordinary increase at any point, it is attributed to the constant release and distributed in numerous places of the river, not being possible to cause abrupt change in quality. Therefore, the basin of the Rio Vacacaí, does not have a large amount of pollutants generally, since no significant changes were observed in the parameters.