We had the same thing happening in England of 2010 I think it was, it turned out it was because of not dredging the waterways, rivers and canals are an important infrastructure that has to keep being dredged whether you want to do it or not, politicians don't realise this until something like floods happen.
Have your politicians been diverting money for dredging the waterways elsewhere or have you never done any?, from what I've seen in this thread it looks like those politicians of yours need to take most of the blame for these floods in Germany.
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