Popular mechanics, which tends to be read by blue collar types and engineers, analyzes the reason for the levees breaking down after Katrina passed...
All but four breaches were due to overtopping and erosion. A key element leading to failures at the 17th Street Canal and London Avenue was the formation of gaps behind I-walls. The morning of the hurricane, water had already risen 1.7 feet above the tops of the levees and floodwalls to an elevation of 14.2 feet. As the water passed over the levees, it eroded the soil supporting the walls degrading their stability and resulting in catastrophic flooding.
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