Where would the plan say to stash 100K+ people? Are those "reception centers" large enough?

I know that if I was on Manhatten Island, I'd be hustling my butt off of there.

As I said in another post, I wouldn't be as concerned about the high rises. You mentioned the Battery tunnel- those are what I'm more interested in. Are any of the subway stations in the areas likely to flood? If so, is there a plan to contain flooding to them? Or would the entire system have to be pumped out?