The main thing I remember about the post-Katrina project wasn't the house they were working on, but the secondary storyline, which was the creation of the "musicians village", a neighborhood just outside New Orleans. I think Harry Connick Jr was involved. There was this swampland that had been developed and everything had been wiped out by the flooding from Katrina. Now, they'd laid out all new roads and were building small houses specifically for local jazz musicians.
During construction of all these houses, there was a lot of rain, so the streets were always full of water, the yards were deep in water and mud, and everything looked miserable. They had a final episode "concert" that was a muck-filled mess. I thought at the time that it was a ridiculous idea to build MORE houses in swampland that had just recently been completely flooded. What do they think will happen next?!? The land is a swamp, 10 feet below sea-level! Stop building there!!! I'll bet the neighborhood always has that smell of mud and dampness, too.
Recently, I read an interview with Norm where he made a reference to the questionable practice of rebuilding homes in places that maybe homes should not have been built in the first place.
At least with the Jersey Shore episodes, they're raising all the homes 10'+ in the air. You have to expect that floods are going to happen; this way, they're at least prepared for them.