From hurricanes, thunderstorms, and low-lying topography, Charleston is very prone to flooding. For years, frequent and damaging flooding events have affected access to essential medical care for Charleston’s three major medical centers. These floods interrupt critical care for patients in need, create unsafe conditions for employees, and limit emergency vehicle access. Through Community Development Block Grant Mitigation (CDBG-MIT) funding, the City of Charleston selected Davis & Floyd to strengthen the stormwater infrastructure for the area.

Our team developed an extension of the existing Spring/Fishburne deep tunnel system and drop shaft to drain the street-level stormwater collection system into the deep tunnel and pump systems of the US 17 Spring/Fishburne Drainage Improvements Project. The design solution for this project includes a new drop shaft, vortex structure, approximately 900 LF of new tunnel to connect the area to the existing stormwater tunnel system, and approximately 425 LF of surface collection piping and associated drainage structures. This project will serve as the collection point for stormwater runoff from the approximately 27-acre Ehrhardt Street water basin that currently experiences substantial rainfall-driven and tidally influenced flooding.

We worked with the hospitals in this district to provide flooding relief. We designed drainage improvements to allow these healthcare facilities to better serve our community.


  • Analysis & Modeling
  • Bidding & Bid Document Preparation
  • Construction Engineering & Inspection
  • Cost Estimating
  • Drainage Study
  • Drainage System Design
  • Easement Platting & Acquisition Support
  • Grant Administration Support
  • Permitting
  • Surveying
  • Utility Coordination