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South Carolina: Risks & Trends

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Same standard as every other page on this site: every figure below is independently sourced, and figures that vary across sources, or measure genuinely different things, are flagged as such rather than collapsed into one number that looks more precise than the underlying data actually supports.

Hurricane Hugo (1989): record storm tides on the East Coast

MetricFigure
Landfall strength Category 4, 135-140 mph
South Carolina deaths 35 (13 direct, 22 indirect, including deaths from candle-caused house fires)
Damage $7 billion
Homes completely destroyed 9,302 (more than half mobile homes)
Homes with major damage 26,772
Charleston peninsula sustained winds/gusts 87 mph / up to 107 mph
Storm surge at McClellanville 20+ ft, the highest East Coast storm tide recorded to that point

The 2015 floods: a 1-in-1,000-year rainfall event

MetricFigure
Deaths 19 (9 in Richland County/Columbia)
Peak rainfall (Columbia, 17 hours) 17 in, wettest day on record
Peak rainfall, some areas ~30 in
Dams failed or breached ~50
Water rescues 1,500+
Roads/bridges closed 500+
Residents displaced 20,000+

Why the damage estimate for this event varies so widely across sources

South Carolina-specific damage estimates for the 2015 floods range from roughly $1.5 billion to as high as $12 billion depending on the source and what’s counted (direct property damage alone versus broader economic impact). Separately, USGS’s own post-event analysis found no clear evidence that streamflow itself reached 1,000-year-event levels at monitored gauges, even though the rainfall total met that threshold in several locations, rainfall probability and streamflow/flood discharge are related but distinct measurements, and they didn’t move in lockstep during this event.

What these two have in common

Hurricane Hugo and the 2015 floods, 26 years apart, both produced record-setting numbers by different measures, storm surge height and rainfall statistical rarity respectively, and both demonstrate that South Carolina’s combination of coastal exposure and inland river/dam infrastructure creates two genuinely distinct paths to catastrophic flooding.

Sources