Floodwater is easily contaminated with sewage, oil and chemicals after hurricanes.
Images of horror, hope and humanity brought home the scope of the storm’s devastation.
The then-Baltimore Mayor pitched in to help New Orleans.
Bush said he was there to remind the country what strong leadership means.
Obama compared the recovery of New Orleans after Katrina to America's ongoing recovery from the recession of 2007.
David Spielman's photographs capture scenes of post-Katrina destruction in New Orleans.
In the wake of Hurricane Katrina, opportunistic, bureaucratic, racist and politicized rebuilding plans kicked New Orleans when it was down.
After Katrina, a Canadian millionaire tried to create an agrarian Shangri-la.