Reviewing Flooding from January through March 2021April 21, 2021
Stormwater flooding on Line Street in the Westside Community.
So far, it’s been a relatively quiet year for flooding in the Charleston area. As of April 20th, there have been seven (7) tides that have exceeded the tidal flooding threshold (MLLW = 7-feet), with five (5) of them occurring in January and two (2) of them in March. Of the seven (7) flood tides, the highest was peaked at 7.23-feet MLLW on March 3rd, which is classified as a minor flood. That’s not entirely surprising, as January, February, & March have historically averaged the 3rd, 2nd, and 1st lowest number of flood tides. As the chart below shows, the first quarter of 2021 was tide the fourth highest number of tidal floods we’ve seen in Charleston Harbor.
We also saw an intense rainfall on the afternoon of March 18th that resulted in flooding across the area, particularly across the Charleston Peninsula. Officially, a record daily maximum rainfall of 2.16-inches was recorded at Waterfront Park, breaking the old record of 1.83-inches set in 1969. The photos below are from the Westside and North Central areas of the peninsula. The floods resulting from this rainfall were not as bad as the ones we saw in September of 2020, and as Sarah Williams pointed out in an Instagram comment, it was first stormwater flooding event in six (6) months.