When I was booking our fall vacation this year I suggested to my wife that spending a couple of days in Venice in off-season time was a good idea. She liked the idea, and we booked a two day stay followed by a train ride to Rome.
I have to admit that the destructive tides that happen in that city have totally escaped my mind. I was oblivious even to the regular tides that happen in winter every year. So it was quite a surprise for us both to learn that Venice was having the worst acqua alta case in the last 50 years.