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This research aims at the study of water flux and interaction of surface water, ground water and meteoric water in the Jacuípe river basin, a 12,163 km area representative of the semiarid region in State of Bahia, using environmental tracers. The results show the potential of environmental tracers to understand the hydrologic cycle in the study area which has insufficient hydrologic measured data. The runoff in the Jacuípe river basin shows a trend of heavy isotope enrichment downstream with a maximum value in São José do Jacuípe reservoir, which reflects the evaporation effect over the river basin and the interference of stream exploitation. The results shows the contribution of meteoric waters to runoff and reservoir supply when heavy rainfall occurs, but in the dry season the runoff is mainly from groundwater contributions and water supply in reservoirs. Key-words:Flux dynamics, semi-arid, environmental tracers.

Estudo da Dinâmica do Fluxo de Água na Bacia do Rio Jacuípe por Meio de Traçadores Ambientais