In New Orleans?
Well, 70% of New orleans is actually below sea level. It is surrounded by very large bodies of water on three sides, all of them higher than the city itself: the Mississippi River, Lake Pontchatraine, and the Gulf of Mexico. New Orleans has a levie(sp?) system in place all along these bodies of water. However, they cannot handle the kind of surge associated with Katrina. Therefore, the water will rush over, creating a ''bowl'' effect.
If you are in New Orleans and are not at least three stories up if and when this hurricane hits, if it does make a direct hit, then your chance of survival is basically 0%. So, if you are staying in your house, you will not survive.
Fortunately, for those who can't leave, the city has sent out buses all over the town, allowing free transportation from their homes to the nearest shelter. Like I said, there is at least 100,000 people who couldn't leave. The superdome can hold about 60,000 people. That means they have to make room for at least 40,000 people elsewhere.
At least, that's what I've gathered from watching the news for the last couple of days.