Floods hold a prominent spot in the creation myths of many cultures, and today they kill more people every year than any other weather phenomenon. How much do you know about floods?
On May 31, 1889, after days of torrential rain, the South Fork Dam burst near Johnstown, sending the waters of Lake Conemaugh roaring downhill. The flash flood killed more than 2,000 people in a matter of minutes.
Art historians worked for years to restore Florence's art after the flood in 1966.
Muddy floods happen when heavy storms on cropland cause a great deal of runoff. They've increased in some areas because of new home construction and the planting of erosion-sensitive crops.
The massive Maeslantkering, which was completed in 1997, protects the port of Rotterdam in the Netherlands. As of July 2009, it hadn't yet been tested by a major storm.
The organization says the risk is 26 percent, compared to a 9 percent risk of fire damage.
According to Weather.com, 95 percent of people killed in flash floods tried to outrun the flood. What you should do is climb to higher ground out of the path of the flood.
It only takes 6 inches (15 centimeters) of fast-moving water to bring you down.
More than 1,000 of the levees failed, but all of the major cities were saved by flood walls.
Because of the failure of the city's levee system, 80 percent of New Orleans flooded.
After thunderstorms drenched Southeastern Ohio that day, three tributaries of the Ohio River flooded and sent a 15- to 20-foot (4.5- to 6-meter) wall of water into Shadyside, killing 26 people.