Project Merit: Water Infrastructure


CH2M (Englewood, Colo.) for its role in the $1 billion Thames Water Lee Tunnel, the first section of the London Tideway Tunnels program to be built and the biggest upgrade to London’s sewerage system since Victorian times. The Lee Tunnel was commissioned in January 2016 – on time and within budget—bringing the UK into legal compliance with the European Community’s wastewater directives for rivers. Managed by CH2M since 2008, the project entailed designing, constructing and commissioning a 4.25-mile long, 23.5-foot internal diameter storage and conveyance tunnel for combined stormwater and sewage effluent. It also included intake, pump-out and overflow shafts, culverts and pumping and control equipment. By eliminating discharges from the Abbey Mills combined sewer overflow (CSO) to the River Lee, the Lee Tunnel alone will reduce the total wastewater discharges from all London’s CSOs to the River Thames by 40%.