George Leslie Ltd

Key Facts

  • Client: Scottish Water
  • Engineer: Atkins
  • Conditions of contract: NEC 3 Option C
  • Contract value: £465,000
  • Duration of works: Nov 2012 - July 2013

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Water Supply & Pipeline Work

Mossfennan Chamber Stabilisation

Mossfennan Chamber is one of the key overflow chambers to control flows on the Talla Aqueduct which provides the principal raw water supply for Edinburgh. Built-in to a steep slope, surveys had indicated movement in the chamber and this project was to stabilise the chamber relieve the external ground pressure, and thus maintain the integrity of the aqueduct.

The Design & Build solution involved installing a waterproofed bored pile retaining wall and capping beam secured with rock anchors on the hillside immediately above the chamber, and constructing mass concrete buttress walls on the other three sides with a new precast concrete roof slab to remove all external loading and thus protect the aqueduct itself.

Significant temporary works were required to ensure the integrity of the aqueduct was maintained throughout construction and this included a temporary piling platform which itself was supported on temporary tubular piling, and a sealed working platform within the chamber to prevent possible pollution of the aqueduct during the concrete work.


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