River Ebbw Bank Stabilisation

Installing VMax P550 Over Reinforced Soil SlopeRock Roll & Live Willow Toe Detail With VMax C350 AboveInstallation CompleteOne Year LaterSize Of Blockstone That Was Replaced With Bioengineered Solution On Over 1.5kmPart Of The Reach Seven Years Later
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Size Of Blockstone That Was Replaced With Bioengineered Solution On Over 1.5km

Salix worked with consulting geotechnical engineers to provide design and build proposals to stabilise over 800 metres of steep riverbank composed of highly erodible colliery shale. Initial proposals looked at the extensive use of large blockstone to stabilise the bank.

Salix wanted to explore the possibility of using greener and more cost effective bioengineering methods which would provide underlying engineering stability whilst providing an ecological resource and improving the visual landscape.

Bank gradient 1 in 1.5 Slope length 10-15m Water depth (1:100) 4m Velocity (1:100) 4.2m/sec Discharge (1:100) 80 cumecs

The toe of the bank was protected using a combination of Rock Rolls and living willow brushwood faggots. The upper bank was protected using two high performance erosion control mats,  VMax³ P550 and  VMax³ C350.

Independent research and thousands of applications across the world have shown these products to be able to withstand extremely high flow velocities (7.6m/s – P550 and 6m/s C350) when vegetated.

Even prior to vegetation establishment the “composite” fibre layer provides exceptional erosion control performance (3.8m/s – P550 and 3.2m/s – C350).

Details

Name: River Ebbw Bank Stabilisation
Client: Merrimans Ltd
Location: Risca, South Wales
Category: High Energy Rivers, Rivers & Water Courses

Case Study