Levees breached on the lake means the pumps can't drain the city, at least not the ones that pump into the lake.
There are some that pump into the Mississippi, they will have to do all the work.
There will be deep water in the lower neighborhoods, which is where the poorest people live, in the crummiest structures, the ones that have termite damage.
Bad news. Pray.
God Speed ya'all!
Off to work.