Not a response to your post but your post gave my head a jiggle to relate this bit.
Galveston, and the disaster there, at the turn of the century, was a city below sea level that got swamped by a hurricane surge, killing between 6 to 12 thousand people.
Galveston realized they had to totally remake their city to remain a place on the map.
It took them 25 years, the project so ambitious.
But one of the key matters that New Orleans faces is one Galveston faced up to, and that is they had to raise the the city upwards and did so by 17feet, bringing in incredible amounts of sand and earth.
They also built a huge seawall.
I frankly, looking at this objectively on a basis of what will really work versus what might work.
And i see that New Orleans need confront they need raise themselves above sea level significantly.
We have 3 cases in the past of cities in part or as whole having to start over, San Francisco, Chicago and Galveston.
One of the things in Chicago they did was to reverse the flow of the Chicago River.
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