Lowcountry firm has plans to fight flooding on Sullivan’s Island

SeamonWhiteside was selected to address flooding on Sullivan’s Island.

Water pooling on the road.

The drainage improvement project is expected to get underway in 2025.

Photo provided by SeamonWhiteside

Lowcountry-based design firm SeamonWhiteside (SW+) is looking to improve flooding issues on Sullivan’s Island. The group was selected for two projects, the Stormwater Master Plan and the Drainage Improvement Project.

The Stormwater Master Plan aims to support the town in enhancing long-term coastal resilience for at least the next 50 years.

The Drainage Improvement Project is a federally funded project awarded through the SC Rural Infrastructure Authority. SW+ will work with Terracon for environmental permitting and geotechnical engineering + GPA Professional Land Surveyors for site measurements.

The project will include the following:

  • Upgrading existing pipes
  • Installation of tide gates to improve capacity and prevent tidal flooding
  • Stormwater treatment devices to improve water quality
  • Techniques to promote natural drainage

The project is expected to get underway in 2025 and be finished by the end of 2026.

More from CHStoday
The bread type is more popular than ever. We’re here to help you find the best loves in the Holy City, or to start making your own.
We asked readers to send us photos of their Charleston-resident pets, and they delivered. Here’s our roundup of Holy City pups.
Dozens of local eateries are taking part, and we’re here to give you the lowdown on the Lowcountry’s best deals.
Different cities and regions have plenty of localized menu items. Now it’s time for cookies to join the fray.
Bookmark this guide for a curated list of events taking place each month that we’re most looking forward to.
Dining in the Holy City is always a fresh experience, with new restaurants popping up all the time — and more on the way.
Hit the road and head to Savannah — we’re sharing all the details about what to do and eat, plus where to stay.
The concept is taking over South Korea’s capital city. We’re thinking about where we’d copy it in the Holy City.
Ever spotted the Holy City on the silver screen? We have.
Charleston is among the hottest real estate markets heading into 2026, so we wanted to investigate.