Water Conveyance Tunnels

WSP designs and manages the construction of water and wastewater tunnels, aqueducts, CSO tunnels and offshore outfalls, and deep shafts in all ground conditions.




Putting Our Experience to Work for You

WSP designs and manages the construction of water-supply tunnels, aqueducts, CSO tunnels and offshore outfalls, and deep shafts in all ground conditions. Our experience includes geotechnical investigations and assessments; ground improvement and tunneling design, including TBM, SEM and micro-tunneling; tunneling in gassy or contaminated ground; and seismic engineering to keep water tunnels operable in the event of earthquakes or other disasters.

We offer comprehensive services for developing water conveyance systems, including planning, design and construction management. In addition to conveyance tunnels, our experience includes pipelines, pump stations, flow control facilities, shafts and special structures related to water and wastewater conveyance.

Our projects include the Boston Harbor Outfall Tunnel, the largest-diameter rock-tunneled outfall in the world, and the award-winning East Side and West Side CSO tunnels in Portland, Oregon. WSP managed the design and construction of the Singapore Deep Tunnel Sewerage System, which comprises 30 miles of deep tunnels and 105 miles of link sewers. On that project, our tunneling engineers oversaw six construction contracts using eight TBMs operating simultaneously.