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Euston 42” Trunk Main Diversion (Phase 1)

Diverting a large water main in a challenging, densely populated urban environment

  • London, United Kingdom

    London, United Kingdom

Careful route selection and innovative design significantly reduced disruption and health & safety risks in central London

High Speed 2 (HS2) Rail Phase 1 will impact approximately 50 km of Thames Water’s pipes in London. This includes a 42” diameter cast iron trunk main, affected in several places by extensive upgrades at and around Euston Railway Station.

Constructed in 1925, the water main was one of the top five most critical obstacles along HS2’s route and required a 2 km diversion to accommodate it. However, finding a route through the utility congested streets of London and identifying connection points to the rest of the existing main presented a significant challenge. During Phase 1 our team worked closely with Thames Water and HS2, to develop an innovative solution that improved buildability, reduced construction health & safety risks and minimised disruption.

The team analysed utilities’ record drawings, non-intrusive surveys and trial holes reports to identify a route that avoided busy road junctions, deep excavations and used connection points at existing structures. By specifying a boltless ductile iron pipe system for ease of construction and carrying out digital assembly rehearsals using 4D BIM, the design team saved hundreds of hours of confined space working and effectively communicated health and safety risks to the workforce. 

At a Glance

  • Thames Water
Expert Spotlight

Jamie Woods, Regional Director, Water Cycle

Collaboration has always been at the heart of my approach – not just in technical delivery, but also business leadership.
Jamie Woods Regional Director, Water Cycle Read More

Jamie Woods

Regional Director, Water Cycle

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