If a new study led by the University of Bristol is to be believed, 41 million Americans are at risk from flooding rivers, according to phys.org. That's more than three times than the current estimate of 13 million people.
The Bristol study is based on a new high-resolution model that maps flood risk across the entire continental U.S., whereas the existing regulatory flood maps produced by the Federal Emergency Management Agency (FEMA) cover about 60% of the continental U.S.
The increase in numbers of those at risk is a result of the expanded coverage of the map combined with its ability to estimate flooding on small streams — something that wasn't adequately captured in previous flood-risk models, according to the study's researchers.
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