Thanks for providing the details. I don't actually think we'll see major breaching, but my point was broader...that the situation will just be worse for future storms unless changes are made.
Hotel collapse in harvey, LA, People trapped
The LSU engineer who studied and modeled the worst case scenarios said that a Cat 5 passing within 30 miles of the city would cause the catastrophic overtopping and filling of the bowl. Of course that is just a theoretical estimate and an imprecise figure. The storm has weakened just enough and is just far enough to the east as to be right on the edge of that predicted 'line of worst case'. So there is still some hope, but it is very dicey.