I dunno, a report I read that the city mayor of NOLA said "everyone is on their own" when a hurricane above CAT 3 is barrelling in toward NOLA. Pundits, experts, and the National Geographic Magazine all said NOLA, from the levee's to the Democrat mayor were ill-prepared for a hurricane higher than CAT 3 as it is.
And it plainly states in LA's emergency plan that the levees in NO could very well fail in a CAT 3 or higher,,