Six drop structures are included within the design to accommodate as much gravity flow to the tunnel as practical and economical.
Final design services for a 96-inch diameter, 6.8 mile long tunnel at a slope of 0.1%.
The tunnel’s main objective is to intercept flows and to take offline the interim Fenton Wastewater Treatment Facility (WWTF).
The tunnel will be constructed entirely in rock and is part of Metropolitan St. Louis Sewer District’s (MSD) Project Clear.
