Avaliação da qualidade da água de um afluente do Arroio dos Lanceiros em Caçapava do Sul – RS

Abstract

The quality of surface water has been a concern due to uncontrolled urban growth that generates environmental problems such as increased irregular effluent discharges that decrease the qualitative and quantitative availability of a water resource and affect aquatic life. Given this, there is a need to monitor and use water resources management mechanisms. Thus, the present study aimed to evaluate the influence of domestic sewage disposal on a watercourse in the city of Caçapava do Sul-RS. According to CONAMA Resolution No. 357/05 the water body falls into class 4. Through the Water Quality Index which incorporates nine parameters (dissolved oxygen, total nitrogen, turbidity, total solids, biological oxygen demand, pH, temperature, thermotolerant coliforms and total phosphorus) it was possible to make a diagnosis of the current state of watercourse quality. The values obtained showed that the water quality of the watercourse according to the IQA is considered poor with average values of 47.17 for point 1, 47.29 for point 2 and 49.18 for point 3. This study showed that Sewage disposal is affecting water quality in the region.