As part of Charlotte-Mecklenburg Utilities' aggressive plan to prepare for stringent sanitary sewer overflow regulations, CDM planned, designed, and provided construction services for an 85-million-gallons-per-day (mgd) wet-weather pump station and screenings facility, a 30-million-gallon concrete lined storage basin, and an 85-mgd grit removal facility at the Irwin Creek wastewater treatment plant, which serves more than 55,000 customers. Highlights include numerous innovative design features, such as a compact, elevated submersible pump station that accommodated tight site constraints within a floodway and triplanar geocomposite mat that facilitated steep basin construction.
Flow equalization upgrades, which operate the system at controlled flow rates during wet-weather events, have reduced the volume and frequency of wet weather overflows by 94 percent.
CLIENT: Charlotte-Mecklenburg Utilities
LOCATION: Charlotte, North Carolina