I, of course, am aware of the damage to the Superdome caused by Katrina, but that was caused by the winds and storming, not flooding. Minnesota's damage was due to excessive snow buildup; again, not flooding. Nor was the damage to Ford Field due to flooding.
This article seems to target flooding as the real issue and the extreme high price tag, so that's why I asked if anyone knows of a stadium ever being destroyed by flooding. I'm not aware of there ever being one.