Cambridge WWTW

As part of the renewal and upgrade of Cambridge’s WWTW works, WJ were called in to efficiently lower the groundwater level. A challenge which we more than rose to.

Having carried out initial preliminary investigation, four new 40m diameter Final Settlement Tanks (FSTs) and associated pipework were constructed without any groundwater cut-off measures. We determined that the excavations would support the use of battered side support with formation levels reaching up to 4.5m below ground level.

WJ enabled construction with a successfully lowering of the groundwater level by more than 2.5m, achieved by the installation of 215 wellpoints installed by rotary drilling techniques which completed around 40 well points a day. Split into two systems, the wellpoints allow continual access to the works area, each system run with duty and standby pumps (due to a quick groundwater recharge rate). No sheet pile cut-offs were required to control groundwater levels, which reduced the time of the project and made the client a significant saving. Always a popular combination, one that we strive to deliver with confidence to each and every one of our clients.

This was completed for the AMP5 framework period for Skanka through the One Alliance Partnership, who delivered £1bn of Anglian Waters capital infrastructure projects in which Cambridge WWTW was a part. We’re now in the AMP6 period and wish to remain working with the alliance to assist in the delivery of the £1.2bn of design and build schemes for the next 5 years.

For further information on the One Alliance Partnership, please click HERE.


  • LOCATION: Cambridge
  • CLIENT: Skansa Jacobs JV
  • MAIN COINTRACTOR: Skansa Jacobs JV

Project Scope

  • Sand

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