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FEMA flood maps may underestimate true risk of US flooding

"National flood maps are underestimating the risk for tens of millions of people in the United States. That’s the conclusion of researchers presenting a new study December 11 at the American Geophysical Union’s fall meeting. [FEMA] estimates that about 13 million people live in a “1-in-100-year” floodplain zone, a region that has a 1 percent chance of flooding in any given year. But the agency’s risk assessment largely focuses on larger streams and rivers, and lacks assessments of risk along smaller tributaries. FEMA’s calculations “miss a lot of the risk,” says Oliver Wing, a geographer at the University of Bristol in England." - Excerpt from ScienceNews.

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