I betcha dollars to donuts that this is a primary reason why buses were not used to ferry the carless out of NOLA, they never had agreed on a plan to set up shelters, other than some virtually meaningless document required for fed funding. Further, I bet one huge reason for that was that cities around the state balked at taking in all the 'problem demographics' from NOLA.
I doubt they had many bus drivers available on 8/28. They were probably all skedaddling with the crooked cops and politicians.
Here's the "virtually meaningless document"