Avaliação da qualidade das águas do rio Ocoí, tributário do reservatório de Itaipu-PR

Abstract

The Ocoí River is a major tributary of the Itaipu Reservoir drinking water source located in southern Brazil. Due to intense agricultural activity, has suffered from the misuse and land use around it. The aim of this study was to evaluate the water quality of the River Ocoí by determining the IQA (quality index of water) in three sampling points, taking in the sights the uses and climatic factors in relation to the results. For this, physico-chemical and microbiological analyzes of water samples were performed regarding the parameters temperature, pH, Dissolved Oxygen, Turbidity, Total Solids, phosphate, nitrate, coliform thermotolerant and Biochemical Oxygen Demand. The number of coliforms thermotolerant was the most impactful variable in two seasons and in points 1, 2, which did not meet the minimum standards required by Resolution 357/2005 of the National Council for the Environment (CONAMA). The calculated indices have values in the range 31-59 at every point and collections, allowing for classification as good. The IQA has proven to be an essential tool in the development of integrated planning, as the ability to detect changes over time and space, thus indicating the priority actions to be performed in strategic planning.