New Orleans
First, I sympathize with the people of New Orleans and Biloxi, Mississippi. I was watching the News Hour on PBS tonight, and even the governor of Louisiana was at a loss for words and was nearly breaking down. It's rare that I see a politician at a loss for words or breaking down.
They also had a man describing how his wife (who has not been seen since) told him to let go of her hand during the flood and tend to their children. Very sad.
There is an interesting article which foretells this sort of thing here:
http://www.colorado.edu/hazards/o/nov04/nov04c.html
There is also an article from the Times, which struck me when I read it years ago, and now is particularly relevant. It is a back issue, so you will need access to ProQuest to find it (Penn State people can use Lias to get to it), but the article title is: Nothing's Easy for New Orleans Flood Control by Jon Nordheimer, published on April 30, 2002, page F1. (I'm not posting it here because I don't want to be sued for copyright infringement)