Another Milestone For Wandsworth Super Sewer

As it's announced that whole project now on track for 2025 completion

The new shaft cover beams. Picture: Tideway London
The new shaft cover beams. Picture: Tideway London

The Dormay Street section of the Wandsworth Super Sewer is another step closer to completion following this month’s installation of two beams to hold the shaft cover.
As the Wandsworth branch of the London Super Sewer moves nearer the finishing line, it was announced last week that the entire Thames Super Sewer Project is on track for a 2025 completion. Following the most substantial review of the programme since 2018, and taking into account the impact of the Pandemic on the build, Tideway’s interim report also confirms an approximate one per cent increase in costs, equating to £39 million. The whole project is on track to come in at £4.2bn, but the estimated £20-£25 annual cost range for Thames Water bill payers remains unchanged.

The two beams at Dormay Street were precast off site and installed in one day using a 200 tonne mobile crane. The cover slab is scheduled to be poured in the next couple of months and will sit on top of the beams to close off the shaft.

The Dormay Street site from the air
The Dormay Street site from the air. Picture: Tideway London

The Dormay Street site is being built on existing Thames Water land between King George’s Park and the Carnwath Road Super Sewer site by the Thames in Fulham, and is being used to connect the existing local combined sewer overflow to the main Super Sewer tunnel.

Project Manager for Dormay Street and King George’s Park, Stephen Lakis, said: “With the casting of the cover slab and closure of the shaft, work at Dormay Street will change focus to the mechanical, electrical, instrumentation, control and automation (MEICA) equipment installation, and then to the testing and commissioning phase.”

The Thames Super Sewer project is designed to capture more than 95 per cent of the sewage spills that enter the river from London’s Victorian sewer system. It will have a significant impact on the water quality, making it a more healthy environment for wildlife to survive and flourish.
The Wandsworth branch of the Super Sewer has been dug out by ‘Charlotte’, one of the six tunnel boring machines being used for the mammoth project. Last year Charlotte completed the construction of the Frogmore Connection Tunnel which will take sewage overflows from King George’s Park through the Dormay Street site and then beneath the Thames and into the main tunnel at Carnwath Road where it will be transferred to East London for treatment, rather than polluting the waterways.

The Dormay Street Tideway site is being constructed on local land where the River Wandle joins the Thames at Bell Lane Creek, where the existing annual sewage discharge into the creek often amounts to a huge two million tonnes.

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December 7, 2021