Floods have frequently been observed worldwide, particularly in urban and rural areas of Brazil as a consequence of antropic impacts and climate change. To cope with the problem hydraulic structures are designed based on the observed maximum flood, or statistically predicted through the rainfall-duration relationship established with recorded data, which are generally scarce. Due to the lack of such data, disaggregation of daily rainfall is generally utilized. In the State of Sergipe-Brazil, the rainfall-duration relationships were established utilizing disaggregated daily rainfalls, observed in 48 stations, and the probability distributions of Weibull and Gumbel. The best results were obtained with the Weibull distribution. The spatial distributions of the parameters of the rainfall-duration relationships demonstrated the high rainfall variability in the region.
flood; design discharge; IDF curves
