content@managingwater.co.uk Storm Water Management


Raising a Toast to SuDS on a Steep Scottish Mountain Highway


“a demonstration of how a SuDS solution can be implemented in a sensitive environment with difficult topography”


cottish Cairngorms Mountains famous for its whisky production have been tackled with an imaginative SuDS Solution from Hydro International which has averted potential road safety problems on the A95.


Poor drainage, flooding and freezing weather had led to a landslip and extreme surface degradation along a section of the narrow A95 that descends on a 10% gradient with tight bends to the picturesque village of Craigellachie on the River Spey, near Elgin.


Located immediately above the River Fiddich, a tributary of the River Spey and a Special Area of Conservation, the area is also world- renowned for the production of single malt whisky and is an important salmon fishery. Control of any surface water runoff would therefore have to include measures which maintained the clarity and purity of the water.


By working with Hydro International’s stormwater design team, BEAR Scotland specified a long term surface water drainage solution which delivered control of surface water flows and minimised any potential pollution from hydrocarbons into the watercourses below.


incorporated three Hydro-Brake® Flow Controls within pre-cast concrete weir wall chambers and a Downstream Defender® hydrodynamic vortex separator.


Investigations as part of Transport Scotland’s upgrade of this section of the A95 Aviemore to Keith Trunk Road, revealed that surface water flowing down the steep hillside had been infiltrating the road foundation structure along the 0.9km stretch near Craigellachie. The water flow had been washing away the aggregate layers and causing a loss of load bearing capacity, leading to premature wear, edge deterioration, and in one location a landslide that resulted in a retaining wall being constructed.


“Winters can be quite extreme in the Cairngorms,” explains Darren McLennan, Senior Engineer, BEAR. “Water freezing inside the road structure creates all sorts of problems.”


“Just addressing the road reconstruction without considering the water flow would have resulted in the erosion problem recurring in a few years time. We also couldn’t afford to have the water flowing over or under the


16


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For further information call the Hydro-Brake® hotline: 01275 337937 or visit www.hydro-int.com


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