With regards to NO, there is new data now available relating to the flood damage - and it is eye-opening.
It has been assumed that the rate of subsidence (sinking) in that area is on the order of 1/10th of an inch a year. What has been found with high-resolution radar scan data (which has now been gone back and re-interpreted post-Katrina) is that the actual sink rate at or near where the breaches occurred is more on the order of ONE INCH PER YEAR, or TEN TIMES the previously believed rate.
In other words, over 30 years, the level of the ground has sunk some THREE FEET.
This is why the levees failed guys. Its not because they were inadequately built, but because the design build height from 30 years ago wasn't maintained. The levees were some three feet BELOW their supposed build height at the time of the storm in many cases, and once you overtop one then the undermining process starts and soon it breaches entirely.
There is no fix for this other than to NOT rebuild in the areas where this sort of subsidence is occurring. NO WILL get hit again - it is just a question of when. Building "flood protection" in an area where the ground is literally sinking out from under you is not possible in a cost-effective manner when it comes to actually providing the protection sought. Concrete and other "long haul" materials are very difficult to add on to, and yet as they sink levees built from them become ineffective.
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