"Ivan" wrote

Depends on the territory. In August 1955, our place in CT got flooded
to just above the piano keyboard on the first floor, and my family had
to leave by boat through the living-room windows. No sure historical
record of a flood that severe there, though there may have been a
comparable one in the 17th century. The place stayed dry for our five
remaining years there, and as far as I know it has never been flooded
since.

I did not live in CT at the time, but I've seen plenty about the flood.
About two miles upstream from me is a new dam, one of many built since '55.
There was severe rain and poor weather forecasting of the hurricane.