North Bristol Relief Sewer

Construction of a new 6.5km pipeline began in summer 2019 and is planned to finish by spring 2023. It will connect Bristol’s existing trunk sewer in Lawrence Weston to the Frome Valley relief sewer near Cribbs Causeway and will direct waste more efficiently around North Bristol to our water recycling centre in Avonmouth. The majority of the sewer has been constructed by tunnelling underground using a tunnel boring machine (TBM), reducing the need to dig trenches. Tunnelling will take place underneath key landmarks, including the M5 motorway and Network Rail’s Henbury Loop freight railway.