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The groundwater system in the metropolitan region of Salvador is a major source of fresh water used for urban and industrial uses. The stable isotope signature for meteoric water collected in Salvador, surface water from the Joanes river basin, and groundwater from aquifers in the metropolitan region of Salvador is used to evaluate some aspects of the interaction between surface and ground waters in this region. The results show: (i) the isotope signature for the surface water is about the same as for the meteoric waters, indicating that evaporation is not affecting the isotopic composition of surface water in the Basin; (ii) there is no enrichment in heavy isotopes from upstream to downstream Joanes, indicating interaction between surface water and groundwater in the basin; (iii) isotopic values of the groundwater near the Ipitanga river (Barreiras Formation) from free aquifers are similar to the meteoric waters, whereas the isotopic values for ground water from the São Sebastião aquifer, taken from depths with fossil waters, show a different isotope signature than the meteoric water; (iv) the linear regression from the isotopic value of the meteoric water is fitted by the line δD=12+8.7δO, similar to the values reported by IAEA (analyzed in 1965 a 1987), except the value of January 2004, very different from the mean value, probably associated with the quantity effect or with the influence of the inter-tropical convergence

Avaliação do Padrão da Composição Isotópica de Águas na Bacia do Rio Joanes: Implicações para a Interação entre Águas Superficiais e Subterrâneas