ENVIRONMENTAL PROJECTS RELATION TO THE QUALITY OF WATER IN SÃO DOMINGOS RIVER BASIN, BRAZIL, IN THE PERIOD 2000 TO 2010
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The São Domingos River Basin is a Water Resource Management Unit from theRivers Turvo and Grande located in the northwest region of São Paulo State, Brasil.Those units were created to promote water improvements, financial support and strategy programs on water quality financing and guiding different projects for local development. This River Basin includes eight municipalities: Ariranha, Santa Adélia, Pindorama, Catanduva, Catiguá, Tabapuã, Cedral and Uchoa. The aim of this study was to make a survey of projects and actions developed and their relation to the São Domingos river water quality from 2000 to 2010. To evaluate the effectiveness of projects some interviews were made with the managers of each town and queries to data reports from the São Paulo State government. The Environmental Company of São Paulo State (CETESB) is responsible for monitoring water quality of state rivers. Some areas along the extension of the River, using indexes as the Water Quality Index (WQI). This Index was used in this study as indicator for water quality once it is the only index that was calculated every year during 2000-2010.To confront the knowledge and participation of the local community in the process of improving water quality in the São Domingos River, 20 persons in each municipality were interviewed. Five places in the basin were monitoring during 2000 to 2010. The WQI annual average of each evaluated area from 2000 to 2010, were fitted in some categories from bad to good, according to the CETESB rating. It was observed that the WQI improved in four points monitored and in one point, in the Catiguá municipality, the WQI was lower in 2010 than in 2000.The number of projects in the São Domingos River Basin increased every year. It started in 2000 with only one project and ended in 2010 with 12 projects. The projects were distributed in the following themes: environmental education projects, reforestation programs, waste recycling campaigns, springs restoration projects, nucleation techniques for environmental restoration, erosion and flood containment works, constructions of sewage treatment plants and technical seminars. The results showed that all the programs and actions implanted by municipality managements from 2000 to 2010 had a straight relation with the São Domingos River water quality and that the Water Quality Index (WQI) can be considered as an efficient indicator for water quality monitoring.