Scotland’s biggest sewer tunnel becomes operational


August 02, 2018 – Environment Secretary Roseanna Cunningham has inaugurated the £100m Shieldhall Tunnel, Scotland’s biggest sewer superstructure, in Glasgow.

Cunningham visited the Scottish Water control room where the country’s pipes and sewers are managed and monitored round the clock.

The Shieldhall Tunnel is expected to reduce flooding incidents and improve environmental conditions.


Stretching for 3.1 miles from Craigton to Queen’s Park via Bellahouston and Pollok parks, it is the flagship project in Scottish Water’s investment in the Glasgow area’s waste water infrastructure and the biggest since Victorian times.

A team of more than 100 workers from various countries constructed the tunnel over nearly two years using a tunnel boring machine (TBM) called ‘Daisy the Driller’, which weighed 1,000 tonnes and was longer than 14 buses.

The tunnel is expected to reduce pressure on the existing waste water network with 90,000m³ of extra storm water storage.

It is also expected to reduce the risk of flooding in Aikenhead Road and Curtis Avenue in Mount Florida and Robslee Drive, Robslee Road, Robslee Crescent and Orchard Park Avenue in Giffnock.

During the construction of the tunnel, more than 500,000 tonnes of earth, stone and clay were excavated and more than 3,200 six-segment concrete rings were installed. More than 90% of the material excavated was recycled.

The Shieldhall Tunnel will reduce the amount and frequency of waste water discharged from several combined sewer overflows (CSOs) and enable 90% of it to be treated at Shieldhall Waste Water Treatment Works before being discharged there.

Cunningham said: “The strategic importance of the Shieldhall Tunnel as part of the ongoing investment across Glasgow by Scottish Water cannot be understated. It’s a fantastic example of the capital investment programme delivering real long-term benefits for communities to reduce flooding, help deal with the impact of climate change and improve the environment.”

Scottish Water CEO Douglas Millican said: “As the Greater Glasgow area continues to develop, we are modernising our waste water infrastructure to support the needs of both existing and future customers.

“The completion of the Shieldhall Tunnel is a key part of that network modernisation.”



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