2 things to consider.

See this rather ooor disaster response?

ONE DAY IT MIGHT BE YOU WHO NEEDS HELP!

Wether from natural or man made disaster... terrorism...

The other issue is sea level is rising, the ice caps are melting fast,
and can raise sea level several feet in the near future. The feds had
already predicted new orleans will be a island surrounded by levees in
100 years. it might be better to move the entire city to higher ground
or as another person posted bring in dirt by rail and raise the entire
place.

long term people shouldnt be allowed to rebuild in flood plains, short
term during a disaster fema trailers should go wherever needed.

In any case we all KNOW government really doesnt care