The plan is laughable. It was never more than a piece of paper. No 'Office of emergency preparedness' was ever set up and no federal coordinators were on site.
In order to implement the plan, federal, state, parish and city governments would have to agree to change and coordinate regulations in order to act in concert. The City and parishes could not afford to spend the sums necessary. Perhaps more important, the political rift between south Louisiana and the rest of the state would have to be resolved before actions could be contemplated and money appropriated. Like most cities, New Orleans is always playing catch-up, since taxes barely cover expenses.
The plan completely ignores federal responsibility under Title 33 for protection along the waterways.

Even if this cloud 8 1/2 plan had been well along, there is no way a city- any major city- could be evacuated in the lead time given.