Water spills into New Orleans' Lower Ninth Ward through a failed floodwall along the Industrial Canal on Aug. 30, 2005, a day after Hurricane Katrina tore through the city Pool/AFP/Getty Images hide caption

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A truck drives on top of a levee that protects a soybean field in New Madrid County, Mo., when the Mississippi River floods. Kristofor Husted/KBIA hide caption

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Roy Presson (C) embraced his daughters Catherine (L) and Amanda on Tuesday as they stood on the edge of State Highway HH looking out at their family farm in Wyatt, Mo. The Presson home and 2,400 acres of land that they farmed was flooded when the Army Corps of Engineers blew a massive hole in a levee at the confluence of the Mississippi and Ohio Rivers to help save the town of Cairo, Ill. Scott Olson/Getty Images hide caption

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