Análise da situação ambiental atual da microbacia urbana Córrego Urubu e da capacidade suporte do córrego como subsídio de enquadramento do corpo hídrico

Abstract

The aim of this study was the environmental assessment of the current situation of the Hydrographic watershed stream Urubu, as a framework subsidy of the water body and to propose, through a prognosis, goals and interventions to be implemented, identifying the determinants for change the current scenario. The environmental assessment of the watershed was based on the method Verah, whose components aspects: vegetation, erosion, Waste, Water and Housing, providing data and able to contribute information on the prognosis of construction with goals and interventions necessary for the recovery of the water body, and improvement of environmental indices of the watershed. The watershed is located in a region with stable socio-environmental situation, it originated almost entirely of planned occupations. The results identified visible impacts on environmental quality: a riparian forest that protects the stream meets respected space, but sparse in some parts of the stream. Erosive events were observed around the watershed, especially for section 3. various pockets of waste were identified in the stream margins and the surrounding land, and domestic effluent discharges in natura directly into the water body, altering the quality of surface water and reducing the ability to support this. After analyzing the possible domestic effluent discharge resulting from environmental impacted the treatment plant located in the Birds Corner neighborhood and confront the stream Urubu quality characteristics with CONAMA law No 357/2005, it was found that the stream water quality presents themselves as poor according to the IQA. The results of DBO5 and dissolved oxygen in the stream parameters presented worse quality scores in the downstream compared with the amount. Regarding the aspect Housing, a watershed is presented with a predominance of residential and commercial area, characterized as high population density. After determining the stream carrying capacity and from depuration study concluded that water body can not autodepurar all effluent released due to the high concentration of organic matter and low-flow stream. Finally, from the diagnosis of the watershed it was possible to develop prognostic indicators improving the environmental quality of the area of study and systematization of future scenarios proposing a reversal of current environmental framework of the watershed, adopting preventive actions, adding programs aimed at the continuous monitoring to promote effective supervision with administrative police power of government agencies, together with environmental education programs for communities.