Thames Tideway Tunnel (Thames Water)
Project: Thames Tideway Tunnel
Client: Bazalgette Tunnel Ltd (on behalf of Thames Water)
Completion date: 2022
Purpose: Transfer sewage waste away from the River Thames, reducing the number of spills from Combined Sewer Overflows (CSOs) and improving environmental water quality in the river.
Details: The new 25km tunnel will lead from Acton in the west of London to Abbey Mills in the east, where it will link up with the Lee Tunnel and convey the sewage to Beckton Sewage Treatment Works. The tunnel will use gravity to transfer waste eastwards and will lie at depths of between 30 and 60 metres. Tunnel Boring machines will enter and exit the ground from three main drive sites: (Carnworth Road (Hammersmith & Fulham), Kirtling Street (Battersea) and Chambers Wharf (Southwark) and the tunnel construction is accordingly split into three sections: West, Central and East.
Key contractors: BAM Nuttall, Morgan Sindall, Balfour Beatty (west section); Ferrovial Agroman, Laing O'Rourke (central section); Costain, Vinci Construction Grand Projets, Bachy Soletanche (east section).
Project milestones: The first two TBMs were lowered into the ground in July 2018; Tunnelling is set to begin 2018; Secondary lining begins 2019; tunnelling ends 2021; system commissioning begins 2022; all works completed 2023.
Birmingham Resilience Project (Severn Trent)
Project: Birmingham Resilience Project
Client: Severn Trent
Completion date: mid-2019
Purpose: To provide an alternative to the Elan Valley Aqueduct (EVA) as a source of water for Birmingham, to be used for up to 50 days every other year during the maintenance periods for the EVA and to provide a solution in the event of an emergency scenario such as an unplanned shutdown of the EVA.
Details: A new river intake and pumping station will be built at Lickhill, north of Stourport, from which water will be transferred via a 25km long pipeline to Frankley Water Treatment Works in Birmingham. Frankley WTW is also being upgraded to accommodate the new source of water.
Key contractors: Barhale & North Midland Construction (pipeline); Doosan Enpure & North Midland Construction (Frankley Water Treatment Works upgrade).
Knostrop WWTW upgrade (Yorkshire Water)
Project: Knostrop WWTW upgrade
Client: Yorkshire Water
Completion date: 2020
Purpose: To expand sludge treatment capacity at the site, which serves Leeds, to support population growth in the region and the generation of sustainable energy.
Details: Replacing a sludge incineration plant built in 1993, the new facility will use anaerobic digestion to generate energy with the biogas feeding CHP engines, and will also feature a dewatering plant with a de-ammonification process. It will be capable of processing 131 tonnes of dry sludge daily, and will generate enough energy to fulfil 55% of the needs of the entire site.
Key contractors: Black & Veatch (project design), Sweco (process engineering - ammonia removal), Clugston Construction (civil engineering)
North Bristol Relief Sewer (Wessex Water)
Project: North Bristol Relief Sewer
Client: Wessex Water
Completion date: Spring 2022
Purpose: The 6.5km tunnel will reduce flood risk and increase stormwater storage capacity to accommodate ongoing and future developments in Bristol and South Gloucestershire.
Details: The tunnel will link the Frome Valley Relief Sewer to the Bristol Trunk Sewer, directing sewage around north Bristol to Wessex Water’s sewage treatment works in Avonmouth. Passing under the M5 motorway and the Henbury Loop freight railway, most of the tunnel will be built deep underground with some sections reaching as much as 30-metres below ground level.
Key contractors: J Murphy & Sons (principal contractor), AECOM (project design)