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Morgan Sindall, as part of the MVB joint venture with VINCI Construction Grands Projets and Bachy Soletanche, is delivering the Lee Tunnel, Britain’s largest water engineering project for 20 years.
The £635 million project (worth more than £208 million to Morgan Sindall) involves the construction of a four-mile length of tunnel to prevent sewage discharges into the River Lee from the largest sewer overflow point at Abbey Mills Pumping Station in Stratford, East London. The seven-metre-diameter tunnel, the width of three London buses, will prevent more than 16 million tonnes of sewage mixed with rainwater overflowing into the river from the Victorian sewer network when it becomes overloaded. The tunnel will store and then transfer sewage to Beckton Sewage Treatment Works, which is being expanded to deal with the increased treatment volumes.
The Lee Tunnel, the first of two planned tunnels, marks a massive step forward in improving the quality of London's rivers and is an essential part of providing the capital with a 21st century sewerage system.
The project includes five shafts, which will be up to 75 metres deep. Tunnelling work started in 2012, and progress is in line with the schedule to meet the required completion date of 2015.
The MVB joint venture has strived to deliver a sustainable project, saving approximately 40,000 tonnes of carbon through design optimisation and achieving a waste diversion rate of 98 per cent. The team has offset disturbance in the estuary by constructing an intertidal habitat on Barking Creek - this 2,000 m2 area provides a breeding site for fish and invertebrates.
Many other measures such as environmental training, waste segregation, charity fundraising and habitat improvement have underpinned the sustainability objectives set out by the MVB joint venture.
The reduction of Combined Sewer Overflows (CSOs) discharging into the River Lee will ultimately improve water quality for wildlife, recreational users and residents of London.
Joint venture: Morgan Sindall, VINCI Construction Grands Projets, Bachy Soletanche