Lee Tunnel, London – United Kingdom

In a nutshell, the Lee Tunnel consists of 5 large diameter shafts with a combined capacity of 350,000 cu. metres, connected by a 7 km long tunnel.


To the east of London, on the banks of the Thames, the Morgan Sindall, VINCI Construction Grands Projets and Bachy Soletanche Joint Venture has built the Lee Tunnel, a major project in terms of both its size and its environmental purpose. The project, initiated by Thames Water Utilities Limited, enable the sewer system to better handle excess runoff during periods of heavy precipitation and ensure more efficient wastewater treatment.


Thames Water Utilities Limited



General contractor

Morgan Sindall, VINCI Construction Grands Projets et Bachy Soletanche (MVB)

Completed in 2013, the 5 shafts – the largest ever built in the United Kingdom – were built using diaphragm walls.

The largest of the shafts has a 1.80 metre thick wall and is 41 metres in diameter and 98 metres deep. A fibre-reinforced concrete is applied to form a lining over the diaphragm wall. A slurry pressure tunnel boring machine was connected the shafts to each other. The Joint Venture was in charge of designing and installing the MEICA equipment and pumps required to manage the sewage.