There are some local governments, NYC for example, that are geared to handle almost anything. N.O. doesn't seem geared to handle anything past a Mardi Gras crowd and even that takes a lot of outside LEOs. For example ,the Mayor didn't know enough to utilize his school buses, but yesterday was asking about spraying aircraft to spray for mosquitos. Another example is all the communications problems. The N.O. Police don't have any comms and I'm sure FEMA has a metric tonne of IRIDIUM sat phones charged up and ready to rock.
That is in fact, what many in FEMA do. Recheck this article for starters...