I have. Holland is delta country, i.e. the area where at least three major rivers (there are a few more) end up in the North Sea. The big 3 are the Rhine, the Maas and the Scheldt and well, occasionally they overflow creating floods.
Also in my youth, I was about 6 y/o, it rained so hard and long here (Hoevelaken) that the street (others as well of course) where we lived almost became a river. I remember us neighbourhood kids playing in the water that evening and had quite a bit of fun.
Both types of events are not that rare in Holland.
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Next person must honestly admit that s/he knows very little about Holland/ The Netherlands. (which is ok of course)