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A new report from the National Oceanic and Atmospheric Administration shows a grim outlook for high-tide flooding, with the next several decades expected to see sharp increases in annual nuisance floods.

Record-setting high-tide flooding occurred last year, forcing residents to deal with flooded shorelines, streets and basements. Without improved flood defense systems, this trend is expected to continue into 2022 and beyond, affecting coastal economies and infrastructure systems such as waste and stormwater management and roads.

The 2021 State of High Tide Flooding and Annual Outlook from NOAA shows the changes in high-tide flooding from May 2020 to April 2011 at 97 NOAA tide gauges along the U.S. coast and provides an outlook through April 2022 along with projections for the future.

High-tide flooding, also referred to as “nuisance” or “sunny-day” flooding, has become increasingly common due to rising sea level. When the high tide reaches levels between 1.5 to 2 feet above average, water begins to spill into the streets and bubble up from storm drains. As sea levels continue to rise, more damaging floods will begin to happen more regularly.

U.S. coastal communities saw twice as many high-tide floods in the last year than 20 years ago, with the trend of near-record sunny-day floods expected to continue for decades to come.

NOAA’s water level records emphasize particular locations of concern in Texas and Florida, with records also being broken in South Carolina and Georgia. Between May 2020 and April 2021, there were more than 20 days of high-tide flooding in Galveston and Corpus Christi, Texas, and Bay Waveland, Miss. Twenty years ago, that number would have been more like two or three days of high-tide flooding. Several other locations in Florida, Texas, South Carolina all tabulated between 10 and 20 days of sunny-day flooding last year, a gargantuan increase from the one or two days seen in these locations in 2000.

By 2030, long-term projections show seven to 15 days per year of high-tide flooding for coastal communities nationwide.

Credit: NOAA
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Story Image: Nuisance Flooding via NOAA

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U.S. High Tide Flooding Breaks Records