Knit, I'm with you if that River is allow to backflow into the Industrial Canal that would be a mess. I'm trying to get elevations of the non-River levees. From what I've seen on the news and my recollection of New Orleans the River levees are much higher.
All the levees, all the heigths:
http://www.nola.com/hurricane/index.ssf?/washingaway/nolalevees.html