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CIVIL ENGINEERING

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BCI AWARDS/ 2005

CHINGFORD SOUTH WATER TREATMENT WORKS Chingford South Water Treatment Works was a rapid response to the prediction that London's north-eastern suburbs could run short of water despite the earlier huge investment in the London Ring Main. Up to 60 megalitres a day of additional treated water was needed in a hurry as the most immediate fix to the twin challenges of leakage and the needs of a population passing seven million.

Plentiful untreated water was available in the huge reservoir system in the Lea Valley but there was not much space left in which to squeeze a new treatment works. So the new plant had to be crammed into a 1.5ha triangular plot bounded by the River Lea diversion channel, a pumping station and the A110 trunk road.

This was also a site of special scientific interest, a natural flood plain and would also have become an un-natural flood plain if the works disturbed several very large mains or the adjacent embankment of the William Girling Reservoir.

To design and build the works, Thames Water brought together three of its contracting partnership teams plus about 100 subcontractors. Off-site prefabrication was used where possible. The whole team was totally focused on first delivering water to supply in less than a year, with peripheral tasks such as permanent access roads and landscaping following. The key supply target was achieved and the job completed under its original budget.

For projects valued between £3 million and £50 million. Sponsored by New Civil Engineer THE TEAM Client Thames Water Utilities Cost £42 million Principal designer Thames Water Engineering Contractor MJ Gleeson Other firms MWH, WS Atkins, Faber Maunsell, Purac, Morrison Construction, Barhale, FSD, Hillcrest, Massey, Skanska, Sheet Piling UK, Weir Pumps, Bedford Pumps, Chemviron, Portarcell, Annord

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