The Rivanna Water & Sewer Authority Rivanna Tunnel Project is located in Charlottesville, Virginia. The project was design and constructed to help offset sewage overflow during heavy rainstorms. The project includes the excavation for a new tunnel and building a new pump station that will sit on a site near RWSA’s Moores Creek Wastewater Treatment Plant. The 1,600-foot long, 11-foot diameter tunnel will stretch from an area near Riverview Park in Charlottesville’s Woolen Mills neighborhood to the RWSA property. The new 60-inch sewer pipe and the pump station have the capacity to move 53 million gallons per day. The tunnel, which was excavated through solid rock, is located at approximately 60 feet below the surface for a large portion of its length, around 85 feet or more at its deepest levels and approximately 30 feet at the most shallow points.
Stiver Engineering provided the contractor with construction engineering through a support system for the 60″ diameter Hobas Pipe during the grouting phase of the 11 ft. diameter tunnel. Stiver Engineering provides pipe buoyancy calculations and pipe support design for contractors throughout the United States.