Estimativa da vulnerabilidade natural à contaminação do aquífero no município de São Sepé - RS

As a result of the significant increase in urbanization and the need to supply the population service increase gradually grows the use of groundwater to meet different uses.Based on this, the studies of the aquifer vulnerability to contamination becomes an important tool. This study aims to map the vulnerability of groundwater in Sao Sepe- Rio Grande do Sul, southern Brazil, which is located in the Uruguayan South Rio-Grandense shield, fractured crystalline aquifer. For the spatialization the method used was GOD, adapted to the Brazilian conditions. Then, a hydrogeological database was elaborated for the eight funding containing the necessary information for the method (degree of containment, middle aquifer and deep water level). The vulnerability cartogram pointed out the predominant class such as low, equivalent to 44,56 % of the total area, followed by the middle class represented by 39,33% and the high class with 12,91% mapped. The extreme and insignificant classes represented 2,78 % and 0,42 % respectively. These results highlight the need for vulnerability indices, which should be considered for the licensing of potentially polluting enterprises and implementation of master plans.