Limnologia e qualidade da água da bacia do Rio Coxipó (MT) : subsídios à gestão dos recursos hídricos

Abstract

It is undeniable that the water quality has been deteriorating with the years. This is mainly due to population and economic growth that demands greater production of consumer goods and services to meet the individual needs of every human being, increasing urbanization close to water bodies, often in a disorderly manner and without planning, as well as the land use and water in rural areas. In the Coxipó River basin are the most diversified water use, especially for public drinking, bathing, dilution of effluents and conservation of biota. Therefore, it is critical to generating knowledge to subsidize decision making to mitigate the negative impacts of human activities in order to ensure water quality for multiple current and future uses and the conservation of the aquatic ecosystems and, therefore, the Pantanal biome, as this is an important tributary of the Cuiabá River, one of the main rivers of the North Pantanal. The aim of this study was to evaluate the seasonal fluctuations in limnological conditions and water quality of Coxipó river and major tributaries, what changes have occurred in these conditions due to the use of water and soil in the basin and the quality of legal standards are met for multiple uses of water required by the population, so subsidizing the planning and management of water resources in the basin. Four samples were taken in different seasonal periods, in nine sampling points being analyzed physical, chemical and microbiological water. It calculated the Water Quality Index (WQI) and made survey on water users field along 60 km of river Coxipó. It was possible to verify the IQA results, the variables that most responded to the change in water quality were the hydrogen potential, dissolved oxygen, total phosphorus, turbidity and Escherichia coli. It was possible to infer that the Chapada dos Guimarães National Park has key role in maintaining water quality and other ecological conditions of water bodies of high Coxipó the river and the process of urbanization, poor land use through activities, lack of investment in basic sanitation, water resources management still incipient, contribute to the deterioration of water quality in the urban area of Cuiabá.