Revista Geonorte (Aug 2017)
BACIAS HIDROGRÁFICAS URBANAS: QUALIDADE DA ÁGUA E CONFLITOS AMBIENTAIS NA CIDADE DE ILHÉUS – BA. / URBAN WHATERSHEDS: WATER QUALITY AND ENVIRONMENTAL CONFLICTS IN THE CITY OF ILHÉUS – BA.
Abstract
Watersheds are considered ideal systemic units for analysis, planning, and environmental management in rural and urban spaces. Qualitative studies of water represent a valuable tool for the construction of environmental indicators. This article aims to analyze the relationship of the use and land cover with water quality in seven sub-basins of Ilheus / BA, with different levels of population density. Dissolved oxygen parameters were used, pH, electrical conductivity, water temperature, salinity, total dissolved solids in the period from 01.20.2015 to 05.12.2015. The parameters were chosen due to its easy of application in the field, low cost, and the importance of this information on the quality of water bodies. The sub-basins show a very fragmented vegetation cover, located mostly in hilly regions, and much of the observed water courses don’t have riparian vegetation along river banks. Only the sub-basin 2 shows a relevant area with vegetation cover. The results of water quality fall into the sub-basins in class: II (use for human consumption after conventional treatment); III (used for human consumption after conventional or advanced treatment); and IV (only use for navigation and the landscape harmony). It was found disparities between the basins of high and low urban settlement due to changes in the results of analyzes of water parameters. Thus, it is clear that a change of physical or chemical factors, together with anthropic action, affects the quality of water for human consumption, among other activities.
