Environment

Are Flood Levels in U.S. Midwest 5 Feet Too Low?

"The official calculations for the '100-year' flood level at St. Louis are about 5.5 feet too low," says Robert Criss, "primarily because they neglect both the tendency for the flood levels to increase over time and the increased volatility we're seeing with extreme weather swings." (Phil Roussin/CC BY-NC-ND 2.0)
"The official calculations for the '100-year' flood level at St. Louis are about 5.5 feet too low," says Robert Criss, "primarily because they neglect both the tendency for the flood levels to increase over time and the increased volatility we're seeing with extreme weather swings." (Phil Roussin/CC BY-NC-ND 2.0)

Federal agencies may be underestimating historic 100-year flood levels on rivers in the midwestern United States by as much as five feet, a new study...




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