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Wycombe Marsh

GE-WM (16-9)

St James Homes appointed JNP Group as their civil, structural and environmental consultants on a new housing development on the site of Thames Water’s redundant High Wycombe Sewage Treatment Works (STW) adjacent to the River Wye in Buckinghamshire.

High Wycombe STW was decommissioned in 2004 following the diversion of flows to a new STW at Little Marlow. Effluent from High Wycombe’s population of 85,000 now travels 4km in a gravity sewer inside a 2.75m diameter service tunnel that has been cut up to 90m deep under the Buckinghamshire hills, at a cost of £56m.

Fully treated effluent was traditionally discharged into the River Wye, so to maintain the hydrological and ecological balance a compensation flow of 300 L/s of ‘clean’ water is now pumped back from Marlow into the River Wye.

This phased development will eventually comprise 350 new dwellings, a community building and a number of B1 industrial units.

JNP Group services provided:

  • Full Geo-Enviromental Site Investigation.
  • Remedation strategy.
  • Negotiations & approval with the Environment Agency & Wycombe District Council.
  • Validation of remediation.
  • Project management of demolition & remediation.

Project Value: £70m

Client: Thames Water/ St James Homes

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