Beats me -- have no idea how long it will take to drain the city. Last night they had an "expert" on levees on and he said they would take out the levees protecting the city to drain it quicker. If they start draining the city won't more water come in? As you can tell I have absolutely zero knowledge about levees.
They really need to bring in pumps. I think that is the only way to get the water out. Now, what will be left after they do that.... (turning green).
I've been trying to learn about their levee system here:
http://www.nola.com/hurricane/images/goingunder_jpg.jpg
It's a HUGE pic and it gives you the option to zoom in but you can't look at it all at the same time, so it's difficult to read.
Earlier I had been trying on the US Army Corps of Engineers websites but they've been down since the beginning of this. It has just come back online, but I haven't combed through all of it yet to see how much info they have:
http://www.mvn.usace.army.mil/pao/visitor/index.htm