The area south of New Orleans has been plagued by flooding since Isaac sloshed ashore as a hurricane on Tuesday evening and pushed water over the 18-mile levee. Aerial video footage shows dozens of homes surrounded by water up their rafters. The flood also unearthed caskets and uprooted trees at a local cemetery. The storm Isaac has been downgraded to a tropical depression, and the extent of the damage is becoming clearer. Crews set out in air boats in LaPlace and saw heavy mud and dirty water caking homes, street signs and trailers. They worked to save cows and other livestock from the debris. Evacuees from that town continue to be ferried by buses to various shelters. Many of them lost everything they owned except what they were able to carrying with them in the minutes before evacuating.