Bad Flooding That Used to Hit NYC Every 500 Years Could Now Happen Every 5 Years: Study - NBC New York

Bad Flooding That Used to Hit NYC Every 500 Years Could Now Happen Every 5 Years: Study

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    NEWSLETTERS

    Experts Creating Plan to Protect NYC From Future Storms

    Experts sailed around the New York Harbor as they talked about their plans to protect the region from the next Sandy. Marc Santia reports.

    (Published Tuesday, Oct. 10, 2017)

    Within the next three decades, floods that used to strike the New York City area only once every 500 years could occur every five years, according to a new scientific study released just days before the fifth anniversary of Superstorm Sandy.

    The study, performed by researchers at several universities and published Monday in the Proceedings of the National Academy of Sciences, primarily blames the predicted change on sea-level rise caused by global warming.

    "This is kind of a warning," said Andra Garner, a Rutgers University scientist and study co-author. "How are we going to protect our coastal infrastructure?"

    The researchers based their analysis on multiple models that factored in predictions for sea level rise and possible changes in the path of future hurricanes.

    Rockaway Boardwalk Breaks Away, Power Lines Spark Fires

    [NY] Rockaway Boardwalk Breaks Away, Power Lines Spark Fires
    A part of a boardwalk floats through flooded streets in Rockaway Park, Queens, and power lines are knocked down on top of trees, sparking fires, after Sandy tore through.
    (Published Wednesday, Oct. 29, 2014)

    Many of the models had a dose of good news for the nation's largest city: Climate changes may mean that storms are more violent, but are also likely to swing further off-shore, meaning storm surge heights aren't likely to increase substantially through 2300.

    However, rising sea levels could mean that floods of 7.4 feet (2.25 meters) or more that struck the New York city area roughly once every 500 years before 1800, and which occur roughly every 25 years now, could happen once every five years between 2030 and 2045.

    Researchers made no recommendations on what public officials or others should do to prepare.

    "The idea is this kind of study we hope will provide information that people making those kinds of decisions can use," Garner said. "We know that when Sandy hit in 2012, of course, subways, tunnels flooded, power was knocked out, parts of the city were just really devastated so studies like this provide some warning."

    Other researchers included scientists from Penn State University, the Massachusetts Institute of Technology, Princeton University, Nanyang Technological University in Singapore, the University of Massachusetts Amherst and the Woods Hole Oceanographic Institution.

    The researchers said there is scientific consensus that global sea level will rise in the coming centuries, although it is not certain how high. They cautioned that sea-level rise at New York City could exceed 8 feet by the end of the century if, in a high-emissions future, the West Antarctic ice sheet rapidly melts.

    From the Archives: New York Awakens to Storm Damage

    [AP] New York Awakens to Storm Damage: Raw Video

    New York City awakened the day after Sandy to a flooded subway system, shuttered financial markets and hundreds of thousands of people without power. In one part of the city, a flooded underground parking garage led to a six-car pileup.

    (Published Saturday, Oct. 28, 2017)

    The study expects about 5 inches to 11 inches (12.7 centimeters to 27.9 centimeters) of sea-level rise likely in New York City between 2000 and 2030.

    The study examined sea level rise through the year 2300.

    "I think the study is valid, but year 2300 is a long way off," said Billy Sweet, an oceanographer for the National Oceanic and Atmospheric Administration who was not involved in it. "What is more certain is the amount of sea level rise likely to occur in the next 50 to 100 years or so and that storm surges from nor'easters and hurricanes will continue to pose a risk for New York City."

    Hurricane Sandy merged with two other weather systems into an unusual storm that devastated the oceanfront coastline and caused catastrophic flooding in New York and cities in New Jersey on Oct. 29, 2012. It was blamed for at least 182 deaths and $65 billion in damage in the U.S.

    State and city officials in New York say they are planning numerous projects to guard against future flooding, including fortifying utilities and transit facilities, and note other projects are still in the design stage.

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