Case study:Inchewan Burn Bed restoration
To discuss or comment on this case study, please use the discussion page.
- 1 Project overview
- 2 Image gallery
- 3 Catchment and subcatchment
- 4 Site
- 5 Project background
- 6 Reasons for river restoration
- 7 Measures
- 8 Monitoring
- 9 Additional documents and videos
- 10 Additional links and references
- 11 Supplementary Information
|Project web site|
|Themes||Fisheries, Habitat and biodiversity, Hydromorphology|
|Main contact forename||Nick|
|Main contact surname||Elbourne|
|Main contact user ID||User:NickRRC|
|Contact organisation||River Restoration Centre|
|Contact organisation web site||http://www.therrc.co.uk|
|Parent multi-site project|
| This is a parent project
encompassing the following
During the creation of a bypass by the river, the burn was engineered by encasing it in gabion baskets to provide structural protection for the roadway piers. Reno mattresses were also used to prevent down-cutting by the burn. In the high-energy environment of the burn, the reno mattresses' protective PVC layer was eroded and the galvanised coating of the mattresses exposed, causing them to split open and the withheld material released. The remaining wire became a hazard for fish, snaring many. Additionally, the downstream gabions would often block surface water in low-flow conditions, with water simply flowing 'through' them in the gaps in between. Accordingly, fish migration was often blocked.
The restoration saw the removal of the reno mattresses and the introduction of boulders to create pools, diversify flow and collect sediment. These boulders were set in concrete to prevent their movement in high flows. Timber extraction of non-native conifer plantation. Planting of native broadleaf tree species. Local school children helped to plant the native broadleaf tree species.
Monitoring surveys and results
Catchment and subcatchment
Select a catchment/subcatchment
Cost for project phases
Reasons for river restoration
Hydromorphological quality elements
Biological quality elements
Physico-chemical quality elements
Additional documents and videos
RRC visit notes (2008):
The new bed has enabled free passage to the upper burn and has had a dramatic impact on the visual ‘eyesore’ previously viewed by users of the popular pathway. The construction of a step-pool bedrock and boulder bed has added stability to the channel and now allows a much freer movement of bed sediment.
The concept of needing to anchor the ‘key’ boulders into the engineered bed but burying this structural element under 500mm+ of placed material allowed concerns over structural stability, morphology and aesthetics to be integrated into a common solution.