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New study finds ‘alarming’ high flood risk for 17 million Americans on Atlantic and Gulf coasts

Researchers used artificial intelligence and FEMA damage data to map flood exposure, finding 17.5 million people at very high risk and 17 million at high risk.

  • A new study published Wednesday in the journal Science Advances reveals 34.5 million residents along the U.S. Atlantic and Gulf coasts face high or very high flood risk, with researchers calculating 17.5 million at very high risk.
  • University of Alabama researchers utilized 16 distinct factors to determine flood risk, incorporating sinking land, pavement density, and social vulnerability including age and poverty levels.
  • New York City has 4.75 million people at high risk with more than 200,000 buildings likely damaged, while New Orleans faces threats to 99% of its population, affecting about 380,000 residents.
  • "When the next big storm hits New York City, people will get hurt, especially those socially vulnerable populations," said climate scientist Wanyun Shao, calling the numbers "shocking" and "alarming."
  • University of Virginia professor Venkataraman Lakshmi said flooding problems will intensify due to human-caused climate change, recommending natural infrastructure like wetlands and rain gardens to mitigate future risks.
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New study finds 'alarming' high flood risk for 17 million Americans on Atlantic and Gulf coasts

One of the most comprehensive studies ever of flood risk has determined that more than 17 million people in eight cities along the Atlantic and Gulf coasts are at the highest risk of being affected by flooding.

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The Columbian broke the news in Vancouver, United States on Wednesday, April 22, 2026.
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