Trying to maintain a city 20 feet below sea level.
Lots of the Netherlands is below sea level. Of course, they are Dutch. And they seldom if ever have 150 mph storms.
Trying to maintain a city 20 feet below sea level.
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Nope...
New orleans averages 6 feet below sea level, its highest point is 20 feet above sea level, about 65% of the city lies below sea level.
https://www.reference.com/geography/far-below-sea-level-new-orleans-690d1df79f841966
Another site I looked up said 8 feet, and apparently part of it sank after being built, it was all originally above sea level according to yet another article.
https://www.worldatlas.com/articles/how-much-of-louisiana-is-below-sea-level.html
Worldatlas.com says 8 feet.
I originally thought the real number was 12 feet, I thought that was what I looked up after Katrina but I guess my memory is not as good as it once was...