Dozens of breaches?

In prepared testimony, Nicholson said what the assessment teams found in New Orleans was very different than what they had expected.

"Rather than a few breaches through the floodwalls in the city ... we found literally dozens of breaches throughout the many miles of levee system," he said.

Although the hurricane had winds near 150 mph, Nicholson said wind damage in New Orleans paled in comparison to the devastation caused by flooding.