Our kind host here, whose neighborhood was under 8 feet of water nine years ago during what locals call "the storm" (Hurricane Katrina) urged me to look at and listen to the good folks at Levees.org. They present a warning to many of us: the kind of flooding we associate with this city could happen in many places.
Not to go all apocalyptic, but this could happen a lot more places than we realize. In California, the Sacramento river delta is at particular risk.
We are told citizen activism has reached new peaks since the storm; in multiple ways, people work to protect communities and to demand that the political structure serve that end.
Climate change probably makes such climate disasters more likely. Just saying ...