Almost two years after the destruction of Hurricane Katrina, many stories are just now emerging from the flood. Joshua Clark has one of those stories to tell. A survivor of the hurricane who chose not to evacuate, Clark became a correspondent for both NPR and Slate during the storm’s aftermath. He’ll join us this hour to discuss his just-released memoir “Heart Like Water: Surviving Katrina and Life in Its Disaster Zone” (Free Press, 2007).