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Welcome to Salix!

Welcome to Salix! Bioengineering – the use of vegetation and natural/man made materials in Civil Engineering construction for surface soil protection, slope stabilisation, watercourse and shoreline protection. Richard Edwards. Typical Issues and Problems.

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Welcome to Salix!

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  1. Welcome to Salix! Bioengineering – the use of vegetation and natural/man made materials in Civil Engineering construction for surface soil protection, slope stabilisation, watercourse and shoreline protection Richard Edwards

  2. Typical Issues and Problems • Incorrect choice of product/solution (Willow spiling/soil filled geotextiles) • Concept that bioengineering is always a soft solution (Hard/soft combine) • Bioengineering can only be used in low energy rivers (Not true) • No performance data with bioengineering materials (There is!) • Long term performance • Maintenance issues (standard get out clause even within the EA) • Not involved till it’s too late (ECI vital) • General civil contractors used on frameworks rather than specialists

  3. Bioengineering correct choice • Challenge soft and hard engineering • Study failures. Why? • Right technique for problem • Undermines confidence • Once bitten twice shy.... Soil erosion control and habitat creation

  4. Bioengineering can be a combination of hard and soft. Replacing four tiers of blockstone

  5. Mobile Gravel/Cobble Bed Cobble Bed Degradation/Bed Down cutting Shading Very Steep/High Energy Blockstone Proposed

  6. Bioengineering Solution

  7. Bioengineering Solution

  8. BioEngineering Solution

  9. 6 weeks on

  10. Slopes Cut & Prepared in Colliery ShaleGrass & Legume Mix Sown Case study 2 River Ebbw – High Energy Blockstone Replacement

  11. High Performance Composite-TRM installed NAG P550 over prepared surface

  12. High Performance C-TRM with Rock Roll & Willow Fascine Toe Live Willow and rock roll toe revetment

  13. Completed Installation Completed Installation

  14. 4 m/s flood! One flood event onto unprotected slopes

  15. Blockstone v bioengineering One year later.

  16. Blockstone v bioengineering Five years later.

  17. Blockstone v bioengineering Five years later....

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