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There have been numerous accounts of rivers retreating so much that land that hasn't been dry in almost 1000 years is again in fact dry.
Torrential rain have also become a lot more frequent where i live, where some locations gets weeks or months worth of rain in 30 minutes. Again, the amount of water may not be different, but the sheer volume and logistics of getting rid of it again may cause temporary flooding.
As for the current flooding in central europe, there were places that got a years worth of rainfall in days, which again causes rivers to transport a lot more water, and when the storm moves downstream it again pours more water down, into the already full river.