Scottish Water starts £17M sewer scheme in Paisley
Scottish Water is about to embark on a £17M project to upgrade the wastewater infrastructure in Paisley. The scheme will improve the water quality and natural environment in two local rivers.
The project includes the construction of a one-mile long sewer, or wastewater tunnel, under the streets of Paisley and the installation of Combined Sewer Overflows (CSOs) in the town centre. These will substantially reduce the frequency of spills from the sewer network into the Espedair Burn and White Cart Water in storm conditions.
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 Paisley project, which is due to start on October 10, is expected to take two years to complete, and will improve river water quality in the two watercourses and, in turn, the River Clyde.
Amey, working for Scottish Water, will construct a large diameter interceptor sewer which will start at Bridge Street car park and go across the Watermill Hotel car park and Lonend before going along Saucel Street, beneath Saucelhill Park and the railway line near Canal Street Station, Espedair Street, Rowan Street and Kilncroft Lane/Neilston Road.
A new large, powered screen CSO will be installed on the opposite side of the White Cart Water from Paisley Abbey. Another CSO will be installed at Causeyside Street/Forbes Place, opposite Dunn Square.
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 the 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.
The new stretch of sewer will have a diameter of up to 1.5m and will be installed at depths of between 4m and 20m. It will be installed using the ‘closed face’ method, with pipe-jacking used to install the pipes behind a Microtunnel Boring Machine (MTBM). A total of 15 shafts will be installed along the sewer route, with the MTBM tunnelling between them.
This method will be much more efficient and less disruptive than using the open cut method of excavating, given the depths of the pipe and the urban location.
Amey will also install a launch chamber and divert two water mains before the main work starts.
Joanna Peebles, Scottish Water’s regional communities team manager, said: “This important project will significantly improve the environment on the White Cart and the Espedair Burn and, in turn, the River Clyde.”
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