The article starts out in the present tense, which might give a false impression that this is happening right now. In Cologne, where I live, the Rhine river actually just recovered from a minor flood as you can see on this chart:
https://www.elwis.de/DE/dynamisch/gewaesserkunde/wasserstaen...
(Everything above 4.5m is considered a flood)
One side effect of the low water that isn't mentioned in the article is that it exposed multiple bombs and grenades from the second world war.