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eight2O

eight2O is the largest alliance in the water sector. The partners involved are Thames Water and two design and build joint ventures made up of Costain, Atkins, Black & Veatch (CABV); and Skanska, MWH and Balfour Beatty (SMB). MWH also leads programme control and IBM is the technology innovation partner.

The alliance brings together global expertise from multiple sectors – including Thames Water – aligned around a common set of outcomes and a shared vision. eight2O is a place where all partners put in their best people, practices and techniques to deliver innovative, sustainable solutions. This brings greater value for money and benefits to Thames Water customers and a stable return.
Together, the alliance will carry out £1.75bn of capital investment work during the AMP6 period (2015-2020), with the potential to extend the contract to 2025.
eight2O
Thames Water

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Holloway Storm Relief Sewer (2021)

In the 1850s, London’s population was approximately two million. In 1858, predicting population growth, Sir Joseph Bazalgette constructed a combined sewerage system collecting both wastewater from homes and businesses, and rainwater run-off, to serve a population equivalent of four million. Now, with London’s population approaching nine million, the sewerage network can become overloaded during severe […]

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Battersea Shaft Pumping Station (2020)

The Thames Water Ring Main (formerly the London Water Ring Main) is a major part of London’s potable water supply infrastructure. Originally constructed between 1988 and 1993, it forms a 50-mile ring of mostly 2.54 m (100”) diameter concrete pipeline to transfer potable water from water treatment works in the River Thames and Lea catchments […]

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Childrey Warren WTW Abstraction Closure (2020)

During AMP4, Thames Water Utilities Ltd (TWUL) undertook low flow investigations for the Letcombe Brook, in the Wantage area of Oxfordshire. It was determined that the abstraction at Childrey Warren Water Treatment Works (WTW) was having an adverse impact on the river flows and the local environment. A subsequent review of options which included augmentation, […]

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Childrey Warren WTW Abstraction Closure (2019)

During AMP4, Thames Water Utilities Ltd (TWUL) undertook low flow investigations for the Letcombe Brook, in the Wantage area (Oxfordshire). It was determined that the abstraction at Childrey Warren Water Treatment Works (WTW) was having an adverse impact on the river flows and the local environment. A subsequent review of options which included augmentation, works […]

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Waterworks Bridge Reconstruction (2019)

Waterworks Bridge is an oblique three-span structure of approximately 30m length crossing the Waterworks River in Stratford, East London and forms a key part of the Greenway footpath and cycleway providing access to/from the Queen Elizabeth Olympic Park from the south-east. Most significantly, Waterworks Bride houses a section of the Northern Outfall Sewer (NOS). Built […]

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Euston 42” Trunk Main Diversion (Phase 1) (2018)

High Speed 2 (HS2) Phase 1 will intersect a large number of critical third-party assets along its 190km route, with a significant impact on several of the UK’s water and wastewater companies. In London, approximately 50kms of Thames Water’s buried assets are affected by construction of the new railway, including a number of highly strategic […]

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Highworth WwTW (2018)

Highworth Wastewater Treatment Works (WwTW) is located at Pentylands Lane, Highworth to the northeast of Swindon. The treatment works currently serves a population of approximately 10,000 customers, with an average daily flow of 1,720m3 per day and a peak flow of 55 l/s. The works is Royal HaskoningDHV’s first full-scale Nereda plant in the UK. […]

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Island Barn Reservoir Remedial Works (2018)

Island Barn Reservoir is located in West Molesey near Hampton Court on the Surrey/London border. The reservoir is a non-impounding reservoir and is retained by an earth fill embankment with puddle clay core approximately 10.8m high and 2,700m long. The reservoir has a stated capacity of 4,191,000m3 and a surface area of 489,700m2, when full […]

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King’s Scholars’ Pond Sewer (2018)

There was evidence of significant internal degradation and deterioration of the King’s Scholars’ Pond Sewer in the vicinity of the Baker Street tube station London Underground tunnel. Degradation included significant cracking of the sewer brickwork as a consequence of considerable settlement of the LUL railway tunnel beneath. The sewer is situated beneath a key artery […]

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Lockwood Reservoir (2018)

Lockwood Reservoir is one of ten Walthamstow reservoirs in north London and makes up part of Walthamstow Wetlands; Europe’s largest urban wetland nature reserve. It is also a Site of Special Scientific Interest (SSSI) and a Special Protected Area (SPA). The Wetlands attract 250,000 visitors a year and is a key site in London for […]

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New Malden Trunk Mains (2018)

New Malden pipe-track contains 3 (No.) 30” and 1 (No.) 48” trunk mains, with the oldest main being nearly 170 years old. The mains feed the Surbiton supply zone and serve as bulk transfer mains to supply south-west London. Kingston Council is going to build a new cycleway over the track; however, these mains are […]

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Nine Elms, Battersea Growth & SuDS (2018)

The Nine Elms redevelopment area within Battersea includes 21,000 new dwellings, office, leisure and retail space creating 8000 new jobs including the new US Embassy, a relocated New Covent Garden Market site and the Northern Line extension. An integrated water management study completed by Thames Water (TW) in partnership with the Greater London Authority, ARUP […]

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Sheeplands WTW (2018)

Sheeplands WTW is a groundwater treatment plant supplying an average of 12Ml/d to the Bowsey Hill Service Reservoir and local district zones. The site comprises of three boreholes, a ‘blending’ raw water supply main received from Harpsden WTW, a nitrate removal plant, GAC vessels, sodium hypochlorite storage and dosing, sodium bisulphite storage and dosing, single […]

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Thames Water UPM Scoping Studies (2018)

The Environment Agency (EA) identified a number of waterbodies which were deemed to be at risk of deterioration or failure to achieve the Water Framework Directive (WFD) ‘good’ status due to the impacts from wet weather discharges from the urban wastewater network. Seventeen of these waterbodies were within the Thames Water region and the risk […]

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Axford & Ogbourne WTWs (2017)

Thames Water Utilities Ltd (TWUL), in consultation with the Environment Agency (EA) committed to cease Kennet Aquifer abstraction at Ogbourne WTW and reduce abstraction at Axford WTW by 31st March 2017. The Ogbourne licence has been reduced to zero whilst the Axford licence has been changed to a sliding scale dependent on flows in the […]

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Basingstoke Sludge Treatment Centre (2017)

The Basingstoke Sludge Treatment Centre (STC) incorporates liquid and caked, raw sludge import facilities together with thermal hydrolysis and anaerobic digestion plant which will process 53tDS/day of sludge from Basingstoke, Farnham, Fleet, Guilford and Newbury. This will fulfil Thames Water’s strategy to cease unsustainable liming activities at the four satellite sites up to the 2036 […]

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Mogden STW (2017)

Mogden Sewage Treatment Works is the second largest in the UK. The first phase was built between 1931 and 1935 at a cost of £1.7 million and covers an area of 55 hectares. The facility treats wastewater from a population equivalent of 1.9 million across a 60 square mile catchment area of north and west […]

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Walton Eel Screens (2017)

In January 2010 the Eels (England and Wales) Regulations 2009 came into force which gave the Environment Agency new powers to protect and to conserve the population of eels in the rivers of England and Wales. The abstraction point for Thames Water’s Walton Advanced Water Treatment Works in Walton, Surrey, removed a maximum of 900ML/D […]

What we do:

Civil Engineering: Project Delivery (Tier 1)

Consultants: Project Delivery

Process Engineering: Project Delivery (Tier 1)