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Paisley environmental project progressing

24 July 2017

Scottish Water is making good progress with a key phase of a project to improve its waste water infrastructure in Paisley.

Work is continuing with the construction of a key part of a one mile-long waste water tunnel, or sewer, under the streets of Paisley. 

Contractors Amey, working for Scottish Water, are constructing a large diameter interceptor sewer which willform the major part of the £17m Scottish Water project which will improve the water quality and natural environment in two local rivers.

The project, which includes the installation of Combined Sewer Overflows (CSOs) in the town centre, will substantially reduce the frequency of spills from the sewer network into the Espedair Burn and White Cart Water in storm conditions.

Last Thursday, a pre-cast concrete cover or cover slab for a CSO was lifted into place in the Causeyside Street/St Mirren Street area.

The cover, which is about 6 metres by 5 metres in size and weighs 22 tonnes, was lifted into place by a 250 tonne crane.

Brian Boland, the project manager, said: “We carried out the work to lift the cover slab into place on Thursday evening, off-peak, to minimise any disruption to road traffic in the area.

“The lifting operation went well and the cover slab is now in place covering the new CSO chamber which has an integrated powered screen. This part of the project is progressing well and we will continue to work closely with local businesses to help minimise any disruption. We thank them for their continuing patience and understanding.”

The investment, which is the biggest of its kind Scottish Water has ever made in Renfrewshire, is part of the company’s £250m, five-year programme of work, launched in 2013, to improve river water quality and the natural environment and tackle flooding across the Greater Glasgow area. 

The overall investment, which includes the Shieldhall Tunnel in south west Glasgow, is the biggest in the Greater Glasgow area’s waste water infrastructure in more than a century.

The project in Paisley started last October and is expected to take two years to complete.

The new sewer will prevent spills by intercepting the overflows from CSOs currently spilling to the Espedair Burn. It will then transfer these flows downstream to a new CSO being built near Bridge Street/Mill Street. The sewer will, therefore, completely remove the spills from the Espedair Burn.
The new infrastructure will fundamentally alter the performance of the drainage catchment in Paisley and retain a lot more of the storm flows in the sewer network, which ultimately go to the Laigh Park Waste Water Treatment Works, meaning storm spills to the White Cart Water will also be substantially reduced.

More information on the investment is available here:

Combined Sewer Overflows (CSOs)

CSOs are designed to spill in heavy weather and allowed to do so under SEPA regulations. They are a feature of most existing sewerage systems where surface water i.e. rainwater from roofs, yards and roads and foul (sewage & trade) effluent flows are combined in one sewer. With increasing rainfall, the combined sewer reaches its hydraulic capacity and a release mechanism is required in order to prevent flooding or inundation of areas (including domestic property and commercial premises) with dilute sewage.