Thames Tideway Tunnel: Protecting, Using and Changing the Shape of the River Thames
This article examines how the Thames Tideway Tunnel project addresses London’s historic combined sewer overflows while reshaping the River Thames with sensitivity to heritage, ecology, and public benefit. Designed to intercept 39 million m³ of sewage annually, the tunnel mitigates pollution at 34 key sites. The project’s integration with the river was central: from minimising visual and hydrological impacts through 3D modelling, to transporting 5.9 million tonnes of materials by barge—reducing road traffic, emissions, and urban disruption.
Construction relied on complex logistics, including bespoke cofferdams and berthing solutions for varied tidal conditions. Tideway implemented a River Transport Strategy, pioneering emissions studies and safety protocols, including a marine Code of Practice and tug master validation programme. This approach fostered long-term improvements in river operations and workforce training, including the launch of the Thames Skills Academy.
Beyond infrastructure, the scheme created new public realm spaces across seven sites, with foreshore structures designed to enhance access, ecology, and the riverscape. The use of durable, locally inspired materials and subtle design elements connects these sites to their contexts and the tunnel beneath.
The project exemplifies a holistic approach to urban infrastructure, integrating engineering, environment, and legacy.
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This paper appeared in the Proceedings of the Institution of Civil Engineers – Civil Engineering, the flagship journal of the Institution of Civil Engineers, published by Emerald Publishing Limited.
Image credit: Tideway