PippaZ
I saw some footage about Belgium just after I posted Kali2. I hadn't realised it had affected parts of Switzerland too.
And the Netherlands Pippa but Germany is the worst.
There are some good explanations and satellite images online about the way the high pressure "fronts" circled Germany and in effect trapped the rain in one area.
The recent (pretty alarming) floods in London were part of the same system apparently.