The monitoring of a river basin is essential for the optimization of water management,
because it provides information and helps the understanding of the physical, chemical
and biological changes resulting from diverse anthropic and natural activities,
facilitating pollution prevention and control actions. To understand a river basin it is
necessary to know its physical characteristics, processes and their interrelations, in
order to obtain information that generates knowledge of its dynamic of functionality.
The objective of this work was to analyze the water quality of the reservoir used for
urban water supply, located in the river basin of São João River, in the municipality of
Porto Nacional, as well as the existing impacts of agriculture from glyphosate agrotoxic
and to use as a potential standard for other similar basins that integrate the Tocantins
River.The study was divided into four stages. Initially the climatic water balance and
climatic characterization were carried out, second was the bathymetric survey and
sediment characterization of the bottom of the reservoir, third was the characterization
of the infiltration and permeability, and the fourth stage was the detection of glyphosate
agrotoxic in the reservoir and water quality analysis of the river basin. The methodology
adopted is qualitative e quantitative, since we have attempted to describe the results
obtained. The parameters analyzed in this work for the detection of glyphosate
agrotoxic and for the analysis of water quality was temperature, oxygen, pH, total
nitrogen, total phosphorus, thermotolerant coliforms, total solids and turbidity, was
APHA (American Public Heath Association) which occurred in the months of August
2017 to September of 2018 in the NSF (National Sanitation Foundation) quality score
calculation. The results obtained demonstrated with respect to the detection of
glyphosate agrotoxic, did not present values higher than the limit allowed by CONAMA
Resolution 357/2005, and that the water of São João River can be classified as of
regular quality according to NSF, although some parameters compared with the
environmental legislation were in disagreement with the standards determined by
resolution 357/2005 of the Conselho Nacional do Meio Ambiente (CONAMA) for class
two of fresh water.
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