Avaliação do traçado e extrapolação de curva-chave estudo de caso: Bacia do Rio Itapicuru-BA

Abstract

One of the bottlenecks management of water resources in semi-arid regions of northeastern Brazil is the availability of information. In the case of water resources in the semiarid region is the availability of consistent data flow of the springs that hampers the efficient management of water. This problem is aggravated by the dynamic fluvial feature intermittent rivers. In this context it highlights the Itapicuru-BA river which is located in the semiarid region of Bahia state and has suffered a great pressure is intensified by constant drought periods that were mainly recorded in the years 2012 and 2013. Along the river there are 13 gauged stations for your monitor, though in some there are extended periods of failures hindering the assessment of the hydrological behavior of the river. In this sense the present study aims to evaluate the route and extrapolation of key curve to estimate the semiarid river flow in the Information System of the State of Bahia Water Resources. For layout of the rating curve was used the power and method for extrapolating the Stevens method, performing a flow measurement by the reel method in fluviometric station 50420000 for complementation analysis. The results show that the curve has a key importance in various aspects of management and planning of water resources. If necessary, fine adjustments of the calibration curves for the flows generated are closer to the actual flow rates and thus reflect the actual behavior of the basin. For this to happen there is a need to obtain consistent data which was a difficulty to the strokes of the key curves. The hydrograms generated from the curve shown consistency key generated in most of the time. Another important aspect is the need for measurements in extreme flood events and dried for better calibration of extrapolations. The results can provide information contributing to the information system on water resources.