Avaliação sazonal e espacial da qualidade da água na microbacia do Rio Ouricuri

Abstract

The colonization of the Brazilian territory has almost always shown itself in a process that gave preference to occupy places that meet the demand of water that is required in the supply of the activities important for the human populations. However, the development of societies in these conditions, without the proper use of knowledge and planning for the best use of natural resources, contributes to disturbances of the balance in nature. Therefore, the present research intends to carry out an evaluation of the microbasin of the Ouricuri River, in the city of Capanema, Pará. In this sense, two campaigns were carried out, one in the month of January (rainy season) and the other in December (less rainy season) of 2018. In these campaigns, water samples were collected for analysis of quality physical-chemical parameters and the application of a rapid evaluation protocol (PAR) in the water bodies. The collected waters were grouped according to the water body of origin of three forms, those belonging to the Ouricuri River, those belonging to the urban streams and those belonging to marginal rivers the urban areas (Rios Garrafão and Capanema) and evaluated according to the framing standards of the resolution of the National Council of Environment nº 357 of 2005. In general, the application of the PAR showed that the Ouricuri River and the urban streams present a low transparency in the water and the presence of a lot of garbage and untreated effluents being dumped in the bed. These characteristics have potentiated the effects of seasonality on the dynamics of water quality parameters in the Ouricuri River watershed. The proximity to the urbanization areas favors the occurrence of changes in the dynamics of physical and chemical parameters, damaging the quality of the water and directly affecting the fauna and flora and, consequently, the population of this municipality of Pará.