Are New Orleans’ post-Katrina flood defenses strong enough?

Ten years ago, the levees and flood walls meant to protect New Orleans failed against the force of Hurricane Katrina. Since the catastrophe, roughly $14 billion have been spent to upgrade the city's storm defenses. But is that sufficient? William Brangham reports.
View the full story/transcript: www.pbs.org/newshour/bb/new-or...