Estudo da influência dos usos consuntivos da água do Rio Corrente (BA) na vazão do Rio São Francisco

Abstract

Brazil is a country with great water availability, but this water is distributed heterogeneously in space and can generate conflicts over its use. These conflicts are more present in rivers that pass through semi-arid regions, such as the São Francisco River, which Upon arriving in Bahia, it receives contributions from the Corrente River and the Grande River, before passing through drier regions of the state. Thinking about the importance of the tributary for maintaining the flow of the main river, this work aims to evaluate the influence of consumptive uses of water in the Corrente river basin on the flow of the São Francisco river. With this aim, rainfall and flow data were collected from the Corrente river basin, concession data from this same river were collected from INEMA and the conflict index of this basin was evaluated. To carry out the hydrological analysis of the São Francisco River, historical series of flows from two more fluviometric stations located in its channel were gathered. With these data it was possible to evaluate the importance of the Urucuia aquifer for maintaining the perenniality of the Corrente river in dry seasons, guaranteeing a monthly contribution to the São Francisco river channel, the growth of demands in the Corrente river basin, reductions in reference flows , permanence curves and base flows in the two rivers studied, thus confirming that the consumptive uses of water from the Corrente river influence the flow that reaches the São Francisco river channel.