re: Unreleased footage of hurricane Katrina from New Orleans fire department documentary

Much of the flooding in NO was from rising water, not from rushing, moving water. In NO, much of the flooding occurred over several days, partially receded, then reflooded during Rita.
In MS it was wind and waves causing the bulk of the destruction. The property at my Aunt's house in Pass Christian was about 22' or 23' above sea level. The house was on piers that were about 30". They still got 4' to 5' of floodwater in the house, not to mention sections of destroyed boardwalk acting as battering rams driven by the wind and waves. Her house survived, but had major damage. It was 22 months before they were able to move back in

Many houses in lower areas, such as Long Beach, were completely slabbed. The remnants of those houses were washed inland about a quarter to half mile in a massive pile of rubble. Along 90 in those lower areas almost every structure was gone.