Thames Tideway Tunnel: Design Responsibilities, Phases and System-wide Design Challenges
This paper outlines the design responsibilities, phased development, and system-wide challenges of the Thames Tideway Tunnel, part of a broader solution to address London’s most polluting combined sewer overflows (CSOs). Delivered by Tideway through NEC3 design and construct contracts, and coordinated with Thames Water, the project included over 20 shafts and 14 tunnels.
The authors describe how Tideway retained responsibility for hydraulic and air management design, while contractors delivered detailed designs for site-specific elements. The integration of engineering structures into the urban environment was guided by design principles and stakeholder engagement, including a heritage interpretation strategy and public art programme.
Innovations included compact tangential vortex drop shafts, vertical deaeration systems for air release, and a novel methodology for ventilation and odour control. A six-stage gated design assurance process, supported by a Design Authority and independent oversight, ensured quality and consistency across diverse contractors.
The project demonstrates how early development of system-wide specifications, collaborative design assurance, and attention to legacy and public realm have contributed to the successful delivery of one of London’s most ambitious infrastructure programmes.
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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