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New England Flood Trends

New England Flood Trends Matt Collins and William Armstrong (NOAA); Noah Snyder (Boston College) Data sources: USGS HCDN stream gauge records Timeframe: records average ~75 yrs through 2006 Variables: Annual floods—largest inst. peak of WY

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New England Flood Trends

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  1. New England Flood Trends Matt Collins and William Armstrong (NOAA); Noah Snyder (Boston College) Data sources: USGS HCDN stream gauge records Timeframe: records average ~75 yrs through 2006 Variables: Annual floods—largest inst. peak of WY Variables: POT/WY—# peaks over threshold per WY Location: 28 (23) New England watersheds Ongoing investigations in U.S. Mid-Atlantic and Atlantic Canada

  2. Annual Series Results • 25 of 28 gauges show ↑ magnitude trends • 10 (40%) have p<0.1

  3. POT/WY Results • 22 of 23 gauges show ↑ annual flood counts • 10 (45%) have p<0.1

  4. Annual flood magnitude trends

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