New information on the cause of the NOLA flood

As usual, the early headlines did not get all of the story. Hence, the danger of hair-trigger punditry.

Floodwall Overtopping May Not Be to Blame

The system of levees and concrete walls that was supposed to protect the New Orleans area from flooding was breached in dozens of places, investigators said Friday, a finding that indicates that the failures were far more widespread than originally thought.

Engineers probing the failures said they are increasingly convinced that floodwaters did not overtop two key floodwalls that collapsed on Aug. 29, swamping large portions of the city.