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  • Frome Valley relief sewer

    We are investing around £15 million in building a new sewer which will ensure our system copes with ongoing and future development in North Bristol and South Gloucestershire.

    The Frome Valley relief sewer will enable us to provide a additional capacity for new developments in areas such as Yate, Emersons Green, Bradley Stoke and Filton, where thousands of new homes are being built.

    Frome valley sewer map

    Frome valley sewer map key

    The first sections of the Frome Valley relief sewer were laid in areas of North Bristol and Yate in South Gloucestershire in the 1980s and 1990s.

    The next phase is to construct a 5km long, 1.8m diameter sewer pipe that will run from Iron Acton, north of Frampton Cotterell, and then westwards to Bradley Stoke. Most of the work will be carried out in fields rather than roads.

    Once built, the sewer will divert waste water flows from South Gloucestershire to Bristol sewage treatment works in Avonmouth via a route around the north of Bristol, rather than alongside the Frome Valley and through the centre of Bristol.

    Diverting the flows will provide additional capacity for the new developments and significantly reduce the risk of sewer flooding in the area.

    The Frome Valley relief sewer is one of many projects included in our £2 billion investment programme to maintain and improve services between 2015 and 2020.

    As part of our sewerage strategy beyond 2020, long-term planning has already started on the Trym Relief tunnel which will transfer flows directly from the North of Bristol to Avonmouth sewerage treatment works.

    The tunnel will start at Bristol Golf Club and pass deep beneath Catbrain, Henbury and Lawrence Weston. Construction is expected to start in late 2019 for completion by 2023.

    What does the work involve?

    Excavation of our access shaft is now complete and we have been successfully tunnelling towards the M4. We have now moved onto the next phase in our work which will involve tunnelling under the motorway. To ensure this important work goes smoothly we will be revising our construction working hours to 24 hours a day, seven days a week between Wednesday 13 and Friday 22 September.

    During this period of work:

    • we will do everything we can to ensure minimal disruption while we carry out our night work as quickly as possible.
    • only essential maintenance and construction activities will be carried out between 6pm and 7 am.
    • material deliveries and removal of excavated material will be limited to normal working hours.
    • lighting will be positioned to minimise impact on local housing.
    • acoustic sound barriers will be used where required.

    Once we have installed the sewer under the M4, we will revert to our normal working hours.

    While we carry out the work we will take care to protect the natural habitats and environment of the local wildlife. Once our work is complete we will return the area to the condition we found it.

    We apologise in advance for any inconvenience this work may cause.

    Frome Valley access map

     Schedule of work

    Planned works: Monday 15 January to Friday 26 January     

    Completion of manholes and in Three Brooks local nature reserve, Bradley Stoke 

    Sewer pipe laying between Swan Lane and Perrinpit Road (fields only)    

    Sewer pipe laying between Bristol Road and Cog Mill Road (fields only)   


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