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A man in New Orleans' Lower Ninth Ward rides a canoe in high water on August 31, 2005. Hurricane Katrina struck the Gulf Coast on August 29, 2005. After levees and flood walls protecting New Orleans failed, much of the city was underwater. At least 1,833 died in the hurricane and subsequent floods. It was the costliest natural disaster in U.S. history. Mario Tama/Getty Images
A woman walks with a dog in the Lower Ninth Ward on May 16, 2015. Mario Tama/Getty Images
Robert Fontaine walks past a burning house fire in New Orleans' Seventh Ward on September 6, 2005. Mario Tama/Getty Images
Houses stand in the Seventh Ward on May 12, 2015. Mario Tama/Getty Images
Residents of the B.W. Cooper housing project play on mattresses on June 10, 2007. Before Hurricane Katrina, B.W. Cooper held about 1,000 families and was the city's largest housing project. Mario Tama/Getty Images
On May 12, 2015, rubble remains at what used to be the B.W. Cooper housing project. The low-income development has been replaced by two-story, townhouse-style buildings. Mario Tama/Getty Images
Duette Sims stands in the heavily damaged Christian Community Baptist Church in New Orleans' Lower Ninth Ward on August 28, 2007. Mario Tama/Getty Images
Parishioners gather during Sunday services in the rebuilt church on May 10, 2015. Mario Tama/Getty Images
On April 25, 2006, workers in the Lower Ninth Ward rebuild the levee that was breached by Hurricane Katrina along the Industrial Canal. Mario Tama/Getty Images
New homes stand along the rebuilt Industrial Canal levee on May 16, 2015. Mario Tama/Getty Images
Two men paddle through the streets past the Claiborne Bridge in New Orleans on August 31, 2005. Mario Tama/Getty Images
A school bus drops off a student in front of the Claiborne Bridge on May 12, 2015. Mario Tama/Getty Images
A lightning bolt strikes above a destroyed church in the Lower Ninth Ward on August 5, 2006. Dozens of churches were destroyed by Hurricane Katrina. Mario Tama/Getty Images
New homes stand in the Lower Ninth Ward on May 15, 2015. Mario Tama/Getty Images
A group of Amish student volunteers tour the Lower Ninth Ward on February 24, 2006. Mario Tama/Getty Images
On May 16, 2015, new homes stand in a development, built by the Make It Right Foundation, for residents whose homes were destroyed. Mario Tama/Getty Images
Water floods a cemetery outside St. Patrick's Church in Plaquemines Parish, Louisiana, on September 11, 2005. Mario Tama/Getty Images
The cemetery on May 16, 2015. Mario Tama/Getty Images