By Clément Bardot (Own work) [CC-BY-3.0], via Wikimedia Commons

Risk of Manhattan Flooding Increases 20-Fold

The chance of the Manhattan seawall overflowing is 20 times greater today than it was in 1844. Portland State University researchers came to the conclusion after collecting and analyzing tide information for the New York harbor. That data showed that major storms that now strike Manhattan about every 10 years cause bigger tides, potentially as high as 2 meters, than the “10-year” storm of the 1800s, which caused 1.7-meter-high tides. The results, published online this week in Geophysical Research Letters, indicate that both sea levels and storm surges are on the rise.

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