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Hydrogeological and hydrochemical behavior in a given region is subordinated to a few specific considerations which will determine the role of groundwater in the regional hydrological cycle. The basic parameter is the area geology. The existing lithological types and tectonic activity developed over them will define the aquifers, their position and interrelations, hydrochemical characteristics and the possibility of developing them. The area morphology, topography and drainage system will supply data concerning the capacity for infiltration, time of residence of the water and aquifer recharge and discharge areas. In this context, the article evaluates the hydrogeological potential, intrinsic vulnerability and hydrochemical types of the groundwater in the Serra Geral Aquifer System, used for human supply in small rural communities in pig farming areas in the Northwest of Rio Grande do Sul state. It also indicates the areas that are more or less vulnerable to contamination. The results obtained spatialize a zone in the area of the study, with a very good hydrogeological potential and low to moderate intrinsic vulnerability of the aquifer, as opposed to zones with a hydrogeological potential that varies from good to poor and moderate to high intrinsic vulnerability of the aquifer, The main RBRH — Revista Brasileira de Recursos Hídricos Volume 17 n.2 Abr/Jun 2012, 31-41 41 hydrogeochemical types identified include calcium or magnesium bicarbonated waters and sodium bicarbonated

rbrh

Avaliação do Potencial Hidrogeológico, Vulnerabilidade Intrínseca e Hidroquímica do Sistema Aquifero Serra Geral no Noroeste do Estado do Rio Grande do Sul