To make an analysis of historic floods, there was the need to compile a database of all floods occurred on the major rivers in Flanders during the last 100 years. First of all, a literature study has been done for Belgium and abroad. Then on the basis of a variety of sources, including newspaper archives and articles, a database was compiled. With this database certain trends in the number of occurred floods could be investigated, both in terms of size and of cause. We have discovered a few trends and oscillations. In general there are periods of more and less floods and the number of floods tend to decrease since 2000. In the second part of this thesis we have made a case study for the Dender. In this study we have calculated a discharge time series with a NAM-model. We have investigated which indicator is the best for predicting floods. This analysis is done for the discharge, the baseflow, the daily rainfall and the rainfall in periods of multiple days. By fitting a logit relation through the empirical flood probability we have found that the baseflow is a good indicator and that the daily rainfall is a bad predictor.
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