This combination of August 30, 2005 and July 29, 2015 aerial photos shows downtown New Orleans and the Superdome flooded by Hurricane Katrina and the same area a decade later. Katrina's powerful winds and driving rain bore down on Louisiana on August 29, 2005. The storm caused major damage to the Gulf Coast from Texas to central Florida while powering a storm surge that breached the system of levees that were built to protect New Orleans from flooding. (Photo by David J. Phillip/Gerald Herbert/AP Photo)

In this combination of Wednesday, August 31, 2005 and Thursday, July 30, 2015 photos, patients and staff of the Memorial Medical Center in New Orleans are evacuated by boat after flood waters surrounded the facility, and a decade later, the renamed Ochsner Baptist Hospital. Nearly 2,000 people died because of the storm, mostly in New Orleans, 80 percent of which was flooded for weeks. One million people were displaced. (Photo by Bill Haber/Gerald Herbert/AP Photo)

This combination of August 30, 2005 and July 29, 2015 aerial photos show the Mid City and Palmetto areas of New Orleans flooded by Hurricane Katrina and the same area a decade later. The storm went down in history as the costliest natural disaster to strike the U.S., with $150 billion in damages to homes and other property. It was also one of the deadliest – nearly 2,000 died. (Photo by David J. Phillip/Gerald Herbert/AP Photo)

This combination of December 10, 2005 and July 28, 2015 photos show Valerie Thomas, of New Orleans, left, and her nieces Shante Fletcher, 6, and Sarine Fletcher, 11, right, looking at the destruction of Valerie's brother's home in the Lower Ninth Ward of New Orleans after returning to it for the first time since Hurricane Katrina, and empty lots in the same area a decade later. (Photo by Gerald Herbert/AP Photo)

This combination of Aug. 30, 2005 and August 14, 2015 photos shows people wading through floodwaters as they go in and out of the Circle Food Store in New Orleans after Hurricane Katrina, and the grocery store a decade later. (Photo by Dave Martin/Gerald Herbert/AP Photo)

This combination of December 16, 2005 and July 28, 2015 photos shows debris in front of the Church of God damaged by Hurricane Katrina in the Lower Ninth Ward neighborhood of New Orleans, and a decade later, an empty lot where it once stood. Before Katrina, the Lower Ninth Ward was a working-class and predominantly African-American neighborhood just outside the city's historic center. (Photo by Jacqueline Larma/Gerald Herbert/AP Photo)

This combination of October 10, 2005 and August 4, 2015 photos shows a tangle of fishing boats blocking the lanes of Highway 23 in Empire, La. after Hurricane Katrina ravaged the region, and the same site a decade later. (Photo by Don Ryan/Gerald Herbert/AP Photo)

This combination of August 31, 2005 and July 31, 2015 photos shows a man pushing his bicycle through flood waters near the Superdome in New Orleans after Hurricane Katrina left much of the city under water, and a cyclist outside the renamed Mercedes-Benz Superdome a decade later. (Photo by Eric Gay/Gerald Herbert/AP Photo)

This combination of September 2, 2005 and August 14, 2015 photos shows the playing field of the Louisiana Superdome in New Orleans littered with debris after serving as a shelter for victims from Hurricane Katrina, and a decade later, the renamed Mercedes-Benz Superdome. (Photo by Bill Haber/Gerald Herbert/AP Photo)

This combination of September 1, 2005 and August 14, 2015 photos shows flood victims in a pickup truck as hundreds of others wait for evacuation at the Ernest N. Morial Convention Center in New Orleans in the aftermath of Hurricane Katrina, and the same site a decade later. Nearly 2,000 people died because of the storm, mostly in New Orleans, 80 percent of which was flooded for weeks. One million people were displaced. (Photo by Eric Gay/Gerald Herbert/AP Photo)

This combination of September 4, 2005 and July 30, 2015 photos show a makeshift tomb at a New Orleans street corner, concealing a body that had been lying on the sidewalk for days in the wake of Hurricane Katrina, and the same site a decade later with an artist's memorial to the woman known as Vera. (Photo by Dave Martin/Gerald Herbert/AP Photo)

This combination of September 3, 2005 and July 29, 2015 aerial photos show the 17th Street Canal flood wall breach and the Lakeview section of New Orleans flooded by Hurricane Katrina and the same area a decade later. (Photo by Haraz N. Ghanbari/Gerald Herbert/AP Photo)

This combination of September 1, 2005 and July 29, 2015 aerial photos show buses parked in a lot flooded by Hurricane Katrina in downtown New Orleans, and the same area a decade later. (Photo by Phil Coale/Gerald Herbert/AP Photo)

This combination of September 3, 2005 and July 29, 2015 aerial photos show downtown New Orleans flooded by Hurricane Katrina, and the same area a decade later. (Photo by David J. Phillip/Gerald Herbert/AP Photo)

This combination of August 30, 2005 and July 29, 2015 aerial photos shows the Lower Ninth Ward of New Orleans flooded by Hurricane Katrina and the same area a decade later. Before Katrina, the Lower Ninth Ward was a working-class and predominantly African-American neighborhood just outside the city's historic center. (Photo by David J. Phillip/Gerald Herbert/AP Photo)

This combination of September 11, 2005 and July 29, 2015 aerial photos show the Lower Ninth Ward of New Orleans flooded by Hurricane Katrina and the same area a decade later. (Photo by David J. Phillip/Gerald Herbert/AP Photo)

This combination of September 2, 2005 and August 14, 2015 photos shows damage to a railroad track in Waveland, Miss., from Hurricane Katrina, and the same site a decade later which is undergoing repairs to drainage pipes underneath the track which were washed out in the historic storm. (Photo by Marcio Jose Sanchez/Gerald Herbert/AP Photo)

This combination of September 2, 2005 and Friday, August 14, 2015 photos shows the steeple from the Main Street Methodist Church blown down during Hurricane Katrina in Bay St. Louis, Miss., and the restored church a decade later. (Photo by M. Spencer Green/Gerald Herbert/AP Photo)

This combination of August 30, 2005 and August 14, 2015 photos shows Odell Harville walking past debris from Hurricane Katrina on Lameuse St. in Biloxi, Miss., and the same site a decade later. The storm caused major damage to the Gulf Coast from Texas to central Florida. (Photo by Jay Reeves/Gerald Herbert/AP Photo)

This combination of September 1, 2005 and July 29, 2015 photos show Harry and Silvia Pulizzano walking across debris from Hurricane Katrina in search of Silvia's brother's home in Waveland, Miss., and the same site a decade later. (Photo by John Bazemore/Gerald Herbert/AP Photo)