NATURAL AND ANTHROPIC EFFECTS ON THE QUALITATIVE ASPECTS OF WATER IN THE NIQUIM RIVER BASIN
Keywords:
Qualidade da água; Uso e ocupação do solo; Disponibilidade hídrica.Abstract
The natural and anthropogenic effects on the water quality of the Niquim River, located in the São Miguel Hydrographic Region, were analyzed with the aim of developing a classification proposal. Qualitative water monitoring was carried out in the Niquim River Lagoon (RNL), the second near the city's water intake (RNC) and the third near the mouth (RNF). The results of the analyses were compared with the limits established by CONAMA Resolution No. 357/05. In the classification proposal, the basin was divided into 3 sections, for which classes 1 and 2 were suggested, but it was found that some parameters do not meet their predominant uses. In section 1, the aim is to increase DO and reduce BOD5,20 and ammoniacal N, through the preservation of forest formations to reduce the organic load in this section. In section 2, it is necessary to reduce the BOD5.20 and ammonia-N parameters by preserving vegetated areas, mainly riparian forests, to reduce the organic load in this section. In section 3, the BOD5.20, ammonia-N, DO and E. coli parameters are above the levels established in the Resolution. In order to reach the limits of the proposed classification in all sections, it is necessary to correctly dispose of effluents, preserve green areas, and plan land use and occupation.
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