Qualidade hídrica e aplicação de geotecnologias na análise agroambiental da bacia hidrográfica do córrego cachoeirinha em Rio Verde – GO

Abstract

Located in the municipality of Rio Verde, southwest region of the State of Goiás, the Cachoeirinha stream is located in an area of intense human activity, surrounded by agricultural properties, farms and an educational institution. The present study aimed to evaluate the influence of land use and occupation on the water quality of the Córrego Cachoeirinha watershed. A study of use and occupation and morphology of the watershed was carried out through water collections that took place in the first week in September (dry period) and first week in October (rainy period) of 2021, at two strategically planned points. The parameters analyzed were electrical conductivity, total dissolved solids, dissolved oxygen, temperature, pH, turbidity, ammonia nitrogen, chemical demand for oxygen and phosphorus. After the analyses, the averages of the results were compared with the maximum values established by CONAMA Resolution nº 357/05. In general, the morphological data showed that the Córrego Barrinha watershed is not very susceptible to erosion and flooding. The values obtained for the evaluated parameters are within the limits established by CONAMA Resolution 357/2005 for Class 2 fresh water. Only the phosphorus parameter obtained results slightly higher than recommended. The water quality results were directly influenced by the use and occupation parameters and morphology of the Cachoeirinha stream microbasin.