Thames Water Ring Main | |
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![]() 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]
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