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Challenges in River Restoration: A Consultant's Perspective

Understand the need for detailed information in river restoration projects, obstacles in transitioning from concept to construction, disparities in engineering and geomorphology, issues with natural processes acceptance, constraints, and challenges with contractors.

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Challenges in River Restoration: A Consultant's Perspective

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  1. Problems and issues encountered on river restoration projects – a consultants view Sally German, Senior Fluvial Geomorphologist, Arup

  2. Appreciation of the need for detailed information • The level of detailed information needed to develop a comprehensive design is often under estimated by the client – esp in the early stages of the project - therefore little budget to undertake geomorphological surveys/investigations to provide robust case for design parameters

  3. Translation of concept to construction drawing • Difficult to present complex and diverse features in a ‘proper’ engineering drawing (and contractors not experienced in undertaking this type of work) – often results in the need for a high level of specialised on-site supervision

  4. Engineering design issues • Disparities between designing features geomorphological vs engineering • Bed material – scour calcs to cope with 1in200yr flows vs ‘typical bed material’ or sediment size determined using sed transport rates • Bank slopes – natural slopes vs geotechnical stability • Structures in the channel – appropriate size vs engineering robustness (i.e. ability to withstand extreme conditions to ensure life of feature and reduce risk to flooding d/s if dislodged)

  5. Acceptance of natural processes occurring • Sediment accumulation and erosion – acceptance (by client) that these processes may occur

  6. Constraints on design • Issues relating to physical constraints – laterally due to development on the bank or the presence of a structure – design needed to manage this if risk considered high

  7. Contractors – in the ground • Getting contractors to be more ‘natural’ with excavations – i.e not getting everything flat/level • Getting contractors to understand the importance of relative levels of the long profile – not just the cross-section – are v important – hard bed needs to be right

  8. Tregaron - before

  9. Tregaron - during

  10. Tregaron - after

  11. Beam Parklands - before

  12. Beam Parkland - during

  13. Beam Parkland - after

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