Floods in Slovenia are becoming more and more frequent and are cause of the third highest damage due to
natural disasters. The basis of effective flood risk management is a reliable frequency analysis that can be
used for estimating event return period. An upgrade of the classical frequency analysis is the regional flood
frequency analysis. Its main advantage is that it allows higher accuracy of flood forecasts also in areas with
shorter or no measurements. Regional flood frequency analysis encompasses four steps: checking
the
accuracy and discordance of data, identification of homogeneous regions, choice of an appropriate frequency
distribution for a region, and quantiles of the selected distribution. The most challenging part of this analysis
is the identification of homogeneous hydrological regions. In this paper we present three methods that can be
used for this step. The regional flood frequency analysis was performed for selected water gauging stations
in Slovenia.
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