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Water spills over a levee along the Inner Harbor Navigational Canal in the aftermath of Hurricane Katrina on August 30, 2005, in New Orleans. Katrina struck the Gulf Coast on August 29, 2005. After levees and flood walls protecting New Orleans failed, much of the city was underwater. AFP/Getty Images
A helicopter rescues a family from a rooftop on September 1, 2005. Floodwaters from Hurricane Katrina stranded thousands of New Orleans residents. POOL/AFP/Getty Images/File
Evacuees crowd the floor of the Astrodome in Houston on September 2, 2005. The facility housed 15,000 refugees who fled the destruction of Hurricane Katrina. Dave Einsel/Getty Images/File
A neighborhood east of downtown New Orleans remains flooded on August 30, 2005. Getty Images
A woman gets carried out of floodwaters after being trapped in her home in Orleans Parish, Louisiana, on August 30, 2005. Getty Images
Police watch over prisoners from Orleans Parish Prison who were evacuated to a highway on September 1, 2005. Mario Tama/Getty Images/File
Daryl Thompson and his daughter Dejanae, 3 months old, wait with other displaced residents on a highway to catch a ride out of New Orleans on August 31, 2005. Thousands were looking for a place to go after leaving the Superdome shelter. Mario Tama/Getty Images/File
Residents of Saucier, Mississippi, line up to get gas on August 31, 2005. AFP/Getty Images
Hanging from her roof, a woman waits to be rescued by New Orleans Fire Department workers on August 29, 2005. Getty Images
People seek high ground on Interstate 90 as a helicopter prepares to land at the Superdome in New Orleans on August 31, 2005. Getty Images
A woman cries after returning to her house and business, destroyed by Hurricane Katrina, on August 30, 2005, in Biloxi, Mississippi. ROBERT SULLIVAN/AFP/Getty Images/File
People search for their belongings among debris washed up on the beach in Biloxi on August 30, 2005. AFP/Getty Images
People try to get to higher ground as water rises on August 30, 2005, in New Orleans. Getty Images
People wade through high water in front of the Superdome in New Orleans on August 30, 2005. Getty Images
President George W. Bush looks out the window of Air Force One on August 31, 2005, as he flies over New Orleans. Returning to Washington from Texas, Air Force One descended to about 5,000 feet to allow Bush to view some of the worst damage from Hurricane Katrina. JIM WATSON/AFP/Getty Images/File