Our projects

Helping Scottish Water reduce flooding

Alnwickhill Road, Edinburgh

Scottish Water had a problem with flooding in Edinburgh, where pressure-relieving valves that were not working had led to bursts.  These valves had been the cause of major flooding in the area.

Scottish Water needed our groundworks support to help the installation of two new Pressure Reducing Valves (PRVs) and connecting pipework for Alnwickhill site, which was constructed by George Leslie Ltd.


kN/m maximum bending moment


bespoke design


by 13.5m by 4.5m deep excavation


Working in partnership with George Leslie and Scottish Water to relieve flooding problems in Edinburgh
Designing a bespoke solution for a huge excavation to deliver 2 new pressure relieving valves
Delivering a successful project in one of the main thoroughfares in Edinburgh

Products used on this project

The challenge

We faced a number of challenges on the project, as it was located next to one of the main thoroughfares into Edinburgh, and was close to a new housing estate.

The project team needed a large open excavation in a bid to reduce the construction programme, due to the potential impact of further bursts.

The large excavation measured 18.3m by 13.5m by 4.5m deep, with a clear opening needed for the new valve chamber and connecting pipework to be installed.

Our solution

To manage this large excavation and the maximum bending moment of 1950kN/m, we used our Supershaft Plus solution in the design as it is one of the industry's leading bracing systems.

We also provided ladder access platforms to meet the specific client requirements, helping the project move along as safely and effectively as possible.

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