The Frome Valley relief sewer provides additional capacity for new developments in areas such as Yate, Emersons Green, Bradley Stoke and Filton, where thousands of new homes are being built.
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 recent phase, completed in 2019, involved building a 5km long, 1.8m diameter sewer pipe running from Iron Acton, north of Frampton Cotterell, and then westwards to Bradley Stoke.
The new sewer diverts waste water flows from South Gloucestershire to Bristol water recycling centre (sewage treatment works) at Avonmouth via a route around the north of Bristol, rather than alongside the Frome Valley and through the centre of Bristol.
Diverting the flows provides additional capacity for the new developments and significantly reduces 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 North Bristol relief tunnel which will transfer flows directly from the north of Bristol to Avonmouth water recycling centre (sewage 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 and be complete by 2023.