Southern Louisiana, like the Netherlands, is inhabitable because of the actions of humankind. Just as the Dutch live behind their ocean dikes, Louisianans live behind their river levees.
Inadequate maintenance of the levees by the U.S. Army Corps of Engineers made the Hurricane Katrina disaster of 2005 worse than it might have been.
There is a problem with the levees. Southern Louisiana is part of the Mississippi River delta, built up of topsoil from a huge drainage area stretching from the Appalachians to the Rockies. The wandering course of the Mississippi deposited this soil over a wide area. With the levees, the Mississippi is confined to a narrow channel. This prevents floods, but also prevents replenishment of the delta. As a result, much of southern Louisiana, including New Orleans, is slowly sinking, creating a need for even higher levees.
There is a good side to this. Sinking replaces dry land with swamps and wetlands. Although swamps and wetlands are not walkable or inhabitable, they provide a buffer against ocean flooding by absorbing the water.
It’s complicated. Global climate change will generate more floods, and make things even more complicated.
Louisiana Loses Its Boot by Brett Carrington for Medium. The source and explanation of the top map. Also a good explanation of the need for accurate maps.
Taming the Floods, Dutch-style by Damien Carrington for The Guardian.