[dirtboy]

They could build up a gravel pad to above sea level and build on top of that.

Which will continue to sink.

A viable city at the mouth of the Mississippi and the Gulf: priceless.

Which Mississippi River? The one that currently flows by New Orleans? Or the one that's gonna form eventually well to the west of New Orleans, leaving the existing channel as a brackish slough?

Move it west. Deal with all three problems once.

[RightWhale]

I'll leave the details to the civil engineers. I just deal in cubic yards and equipment.

[Schwaeky]

It's not going to move for ten thousand years, and even if it did sooner, manmade excavation can keep it where it is now...