I suppose it would be like Katrina (New Orleans) or Sandy (New York), which of course un-flooded after the storm, but each time it floods, with the base sea level being higher than last time, it gets progressively worse until you just give up spending the money to reclaim the land and protect it from the next storm.

Maybe look into whatever it is they do in the Netherlands. A very large fraction of the entire country is just barely above sea level (or even below it in places).