That family is probably on the lower end of the buyout cost, but it puts the total cost of a buyout in the range of $1 billion or $10 billion.
So then the question is how much flood protection can be built for a similar cost.
I think there's also issues with flood controls for one area making flood control in other areas more difficult. So drawing a line can help with that.
Of course they are allowing commercial developments to continue, check this out:
Louisiana – Other Oil & Gas Infrastructure: http://www.dnr.louisiana.gov/assets/images/oilgas/refineries...
Louisiana – pipelines and platforms: http://www.dnr.louisiana.gov/assets/images/oilgas/refineries...
And as far as protecting land value, that shouldn't be funded at a national level (it could be somewhat subsidized by cheap loans or something), it should be funded by the owners of the land.
I had never heard of salt dome storage until reading this book. Scary stuff.
Articles should show the maps.
Polders and Dikes of The Netherlands for comparison: https://www.thoughtco.com/polders-and-dikes-of-the-netherlan...