In late January 2007 CRL were awarded the contract to carry out the refurbishment of Bowden Service Reservoir, near Chippenham in Wiltshire.

The works included both external and internal refurbishment. The reservoir consisted of 2(two) compartments and to minimize any disruption to the local water supply, only one compartment could be worked on at a time whilst the other compartment had to remain ‘live’. Coupled with this restriction, not only was the programme extremely tight, but the works were required to be carried out in the cold months during February and March.

The external refurbishment works included:

• Removal of all the topsoil and overburden covering the reservoir using a long reach excavator
• Waterproofing of the Reservoir roof using Dualseal membrane (circa 600 m2)
• Installation of an extensive deckdrain system over the entire Reservoir roof
• Installation of new duct runs for telemetry around the Reservoir gully

Due to the short contract duration it was necessary for the works to be carried out to both the externals and internals of the reservoir simultaneously.

The Internal works included:

• Over-pumping of the clean water between the tanks to minimize wastage
• Concrete repairs to the soffit of the reservoir
• Installation of over-banding to all the reservoir expansion joints           
• Application of a protective waterproof coating  (Sikatop Seal 107) to the soffit of the reservoir
• Final cleaning of the reservoir compartment on completion of the works ready for chlorination by the Client

Contract Value: £260,000.00

Client: Wessex Water Services