It's a nightmare for the poor souls that have nowhere to go.....shelters will be worthless won't they?
The Superdome has 4 or 5 levels. Certainly the top three or four would be above the floodline (assuming the structure can hold up). Seating capacity is aroung 60,000 I believe, with room for thousands more on the outer concourses.
It depends. There are a lot of variables here that are unknown - strength at landfall, eye landfall position (east or west of Lake Ponch, and forward speed of the hurricane when it makes landfall. A direct hit is not instantly an epic disaster unless the other variables align. Basically, a lot has to go "right" in order to create the doomsday scenarion. NO has a substantial homeless and impoverished population most of which are basically screwed if all the numbers come out "right". Further reaching impacts though are within the aftermath and what actually happens to the city. Some of those things are too terrible to begin to contemplate.