- Sector:Water & Utilities
- Client:Thames Water
- Location:North London
The Thames Water Ring Main (TWRM) in London is an 80km long, 2.5m diameter tunnel built between 1988 and 1994 to take water from five treatment works and transfer flows via pumping stations housed in shafts along the route. It is a major part of London’s water supply infrastructure and carries an average daily flow of 0.3 x109 gigalitres – a little under one-sixth of the capital’s daily demand.
Barhale was appointed by Thames Water to carry out refurbishment works at Barrow Hill Shaft, one of a total of 22 on the ring main. Located at St. Edmunds Terrace on the edge of Primrose Hill in North London, Barrow Hill is the deepest of the shafts at 80m deep and also the biggest with a four way tunnel connection at its base.