Charleston SC 1966 Tidal Flooding Days - 4; Charleston SC 2016 Tidal Flooding Days - 50

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Climate scientists view sea level rise as one of the most obvious signals of a warming planet. Sea water expands as it warms, and melting land-based ice sheets adds to rising water levels. There are neighborhoods that now flood on sunny days, but didn’t years ago even during especially high tides, according to the National Oceanic and Atmospheric Administration. And as sea levels continue to rise, the frequency, depth and extent of coastal flooding will continue to worsen, according to NOAA.

In 2016, Charleston saw 50 days of tidal flooding. Fifty years ago? Just four days. Flooding projections are set at about 25 percent above average for 2017-18 for areas including Wilmington, according to a recent NOAA report. Wilmington had 84 days of high-tide flooding in 2016, according to NOAA.

"It is important for planning purposes that U.S. coastal cities become better informed about the extent that high-tide flooding is increasing and will likely increase in the coming decades," according to the February 2018 NOAA report.

Sea levels rise and waters inundate storm drains and wash over flood barricades — flooding buildings and streets. While flooding impacts might be limited or not obvious in those area right now, stormwater systems are reported to be degraded, "increasing the risk of compound flooding during heavy rains," according to NOAA.

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http://www.newsobserver.com/news/technology/article210413904.html