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Low Flow Discharges Regional Analysis using Wakeby Distri- bution in an ungauged basin in Colombia.

In order to estimate low flow return periods for an ungaged watershed in Colombia, a regional analysis of low flow discharges was performed using the Wakeby probability distribution function. This distribution is more flexible than other distributions and separates the distribution's extreme tails; these are advantages for modeling flow discharges. A procedure for estimating the parameters of the distribu- tion is also presented. The frequency analysis results of 18 to 36 long time series is shown. The goodness of fit test was evaluated with the Graphic Correlation Coeffi- cient (GCC), the Standard Error of Fitting (SEF) and the Graphic Test; they were useful tools for testing the best fit with Wakeby distribution, which was better than LogNormal II and Gumbel distribution. The Index Flood Method for Regional Fre- quency Analysis was applied with Wakeby distribution and the discharge was stan- dardized with the area. Discussions and conclusions are presented.