Estimated of Local Maximum Flow in Watershed of Zambeze (PAP014758)
felix eusebio banze, Heinz D. O. A. Fill
Floods in a changing climate
Information about maximum local flow is important to control and mitigate flooding in a given area or watershed or by hydraulic structures. The present study aimed to calculate the maximum flow for different return periods (2 to 10000 years) in the Zambeze watershed using probability distributions recommended in the literature. Annual natural maximum flows of a period of 58 years were used. The data were obtained at E-320 station, located in Mozambique (Tete province). To estimate the flood flows the following probability distributions were used: Log -Normal, Log - Pearson type III, generalized extreme value (GEV), Gumbel and Exponential. In order to test the fit of these distributions the Kolmogorov Simirnov test was used. The methods of L-Moments (MML) and Moments (MoM) were used to determine the parameters. The results allow to conclude that the maximum flow rate for the given return periods ranges from 5210 to 30200 mAs-1 and all distributions used were suitable for the estimation of maximum flows, however the distribution that provided the best fit was Gumbel.