George Leslie Ltd

Key Facts

  • Client: Scottish Water
  • Engineer: March 2008 – April 2009
  • Contract value: £1,300,000

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Water Treatment Works

Mosside Works

The Pumping Station was constructed in 1961 and consists of a Dry Well and Wet Well chambers (which are separated by penstocks) and is covered by a brick building. The sewage drains from the collection inlet and flows to two identical sumps and is controlled by a penstock. The Pumping Station contains 3 no. Foul Sewage/Storm Pumps (Duty / Standby/Assist) which are installed in the Dry Well and are controlled by Variable Speed drives on a new MCC panel installed in the control building at ground level.

The pumps are controlled by the level in the wet wells and by the maximum flow allowable to be passed forward in the re laid rising main.

In the event of storm conditions that exceed the capability of the pumps to pass forward in the rising main, a new Storm Storage tank of 513m³ has been constructed at the site. The excess flow will gravitate to the Storm Tank via a powered Combined Storm Overflow (CSO) located in a chamber joined onto the sewer intake channel in the wet well. If the tank fills to capacity the emergency overflow will divert the overflow to Bog Burn via the new outfall.

The contents of the Storm tank are returned, by Storm Tank Return Pump, to the works inlet when the level in the wet wells in low enough to accept it. The flow returned to the inlet is monitored and recorded on a flow meter.

News updates


The overall project involves the off-site fabrication and installation of a new linkspan structure at Oban Ferry Terminal for client Caledonian Maritime Assets Ltd (CMal).

12th February 2019

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GL return to the Sound of Kerrera

GL making a return visit to the Sound of Kerrera off Oban, to undertake substantial repairs to the breakwater which suffered collision damage following an altercation with a workboat earlier this year.

14th December 2018

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Polmadie Bridge official opening……..

Michael Matheson MSP and Cabinet Secretary for Transport, Infrastructure and Connectivity covered all his portfolios at the official opening of the new Polmadie Footbridge giving pedestrian and cycle transport access,

18th September 2018

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George Leslie Ltd, Blackbyres Road, Barrhead, Glasgow, G78 1DU  |  |  +44 (0)141 881 9131