| Thames Water Ring Main | |
|---|---|
.jpg) Ring Main shaft and pump house at New River Head | |
| Overview | |
| Type | Urban water infrastructure |
| Status | Operational |
| Locale | Greater London |
| Construction Period | 1988 - 1993, 2007 - 2010 |
| Website | http://www.thameswater.co.uk |
| Owner | Thames Water |
| Technical | |
| Tunnel length | 80 km (50 mi) |
| Capacity | 1.8 Gl/d (gigalitre / day)[1] |
| Depth | 10–65 m (33–213 ft) |
| Tunnel diameter | 2.54–2.91 m (8.3–9.5 ft) |
| Cost of construction | £248m (initial construction)[2] |
The Thames Water Ring Main (TWRM, formerly the London Water Ring Main) is a system of approximately 80 km (50 mi) of concrete tunnels which transfer drinking water from water treatment works in the Thames and River Lea catchments for distribution within central London.
A major part of London's water supply infrastructure, the initial ring was constructed by Thames Water between 1988 and 1993 at a cost of £248 million (equivalent to £638 million in 2023), and when completed, it was the longest tunnel in the UK.[2][3] Two extensions were constructed between 2007 and 2010.[1]
- ^ a b Cite error: The named reference
timelineswas invoked but never defined (see the help page). - ^ a b Bensted, I H (January 1994). "Historical Perspective and Corporate Overview". Proceedings of the Institution of Civil Engineers - Civil Engineering. 102 (6): 1–8. doi:10.1680/icien.1994.27264. ISSN 0965-089X. Retrieved 30 July 2022.
- ^ "London Ring Main turns 25". Thames Water. 15 November 2019. Retrieved 30 July 2022.