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North Bristol Relief Sewer Project

Event organised by The British Tunnelling Society

25 May 2023

This event has now ended

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J Murphy & Sons commenced construction of a new 6.5km pipeline for Wessex Water in summer of 2019. Now completed it connects Bristol’s trunk sewer in Lawrence Weston to the Frome Valley relief sewer near Cribbs Causeway and will direct waste more efficiently around North Bristol to the water recycling centre in Avonmouth.

5.5km of 2.85m diameter segmentally lined tunnel has been completed using an EPB TBM with the remaining 1km predominantly constructed using open cut methods.

The presentation will overview the project, and initial optioneering that was carried out to develop the scheme and, discuss progress and achievements to date.



Murphy is a leading global, multi-disciplined engineering and construction company founded in 1951 that improves lives by delivering world-class infrastructure.


Dominic Barlow

Dominic Barlow

J. Murphy & Sons Ltd

senior project manager

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Dominic Barlow

Dominic studied at the University of Exeter’s Camborne School of Mines. He was awarded the Sir Thomas Harding Mine Surveying Prize in the year 2000, and graduated B Eng. (Hons) ACSM in Mineral Surveying and Resource Management in 2001.

Since leaving university, Dominic has predominately worked within the tunnelling industry, delivering projects within several industry sectors including, road, water, power and rail. Dominic has utilised many techniques of tunnel construction, ranging from large diameter TBM bores through to Sprayed Concrete Lining of tunnels and chambers at various diameters.

Notable projects Dominic has worked on include Heathrow’s Airside Road Tunnel and T5 tunnels for the HEX and PicEX. The Lower Lea Valley Cable Tunnels for the 2012 Olympics. The United Utilities Preston 7 UID’s scheme and others within the water and power sectors.

Dominic joined Murphy’s in 2006, he initially worked on the LLVCT Tunnels, and progressed from this position to become Tunnel Manager working on multiple tunnelling projects, prior to becoming the Senior Project Manager on the North Bristol Relief Sewer.

Adam Evenden

Adam Evenden

J Murphy & Sons Ltd

project engineer

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Adam Evenden

Adam studied for a BEng in Mining Engineering at Camborne School of Mines and graduated in 2014 and is a Chartered member of the Institute of Materials Minerals and Mining.

He has worked in the tunnelling for the past 8 years, predominantly on TBM tunnel drives in London. He started as a graduate shift engineer for J Murphy and Sons working on the New Cross to Wellclose Square Deep Cable Tunnel. Following this he joined Ferrovial for two and half years as a shift engineer/ shift manager working on the Northern Line Extension and Tideway Central. He then re-joined Murphy in 2019, as a Senior Engineer working on the North Bristol Relief Sewer project. He has since been in the work winning team as part of BMJV for the Lower Thames Crossing tender.

For more information please contact:

Shelly-Ann Russell