Case study:Inchewan Burn Bed restoration: Difference between revisions
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|Project summary=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. | |Project summary=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. | 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. | ||
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{{Image gallery}} | {{Image gallery}} | ||
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|Average channel gradient category=0.01 - 0.1 | |Average channel gradient category=0.01 - 0.1 | ||
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{{ | {{Project background | ||
|Reach length directly affected= | |Reach length directly affected=100 m | ||
|Project started=2007/09/01 | |||
|Works completed=2007/11/01 | |||
|Total cost category=50 - 100 k€ | |||
|Project started= | |Total1 cost=100 k€ | ||
|Funding sources=Scottish Environment Protection Agency, Perth Council, Scottish Natural Heritage | |||
|Investigation and design Lead organisation=Perth Council | |||
|Investigation and design Other contact forename=John | |||
|Works completed= | |Investigation and design Other contact surname=Monteith | ||
|Stakeholder engagement Lead organisation=Perth Council | |||
|Stakeholder engagement Other contact forename=John | |||
|Stakeholder engagement Other contact surname=Monteith | |||
|Total cost category= | |Works and supervision Lead organisation=Perth Council | ||
|Post-project management and maintenance Lead organisation=Perth Council | |||
|Total1 cost= | |Monitoring Lead organisation=Perth Council | ||
|Monitoring Other contact forename=John | |||
|Funding sources= | |Monitoring Other contact surname=Monteith | ||
|Investigation and design Lead organisation= | |||
|Investigation and design Other contact forename= | |||
|Investigation and design Other contact surname= | |||
|Stakeholder engagement Lead organisation= | |||
|Stakeholder engagement Other contact forename= | |||
|Stakeholder engagement Other contact surname= | |||
|Works and supervision Lead organisation= | |||
|Post-project management and maintenance Lead organisation= | |||
|Monitoring Lead organisation= | |||
|Monitoring Other contact forename= | |||
|Monitoring Other contact surname= | |||
}} | }} | ||
{{Motivations | {{Motivations | ||
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{{Measures | {{Measures | ||
|Bank and bed modifications measure=Removal of artificial wire/stone bed, Replicated upstream boulder bed step/pool sequence | |Bank and bed modifications measure=Removal of artificial wire/stone bed, Replicated upstream boulder bed step/pool sequence, | ||
|Floodplain / River corridor=Removal of non-native species, | |Floodplain / River corridor=Removal of non-native species, Large scale planting of native species, | ||
|Planform / Channel pattern=In-channel placement of boulders to provide flow diversity | |Planform / Channel pattern=In-channel placement of boulders to provide flow diversity | ||
|Wider stakeholder / citizen engagement=Local | |Social measures=Student Education, | ||
|Wider stakeholder / citizen engagement=Local support, | |||
}} | }} | ||
{{Hydromorphological_quality_elements_header}} | {{Hydromorphological_quality_elements_header}} | ||
Latest revision as of 13:37, 1 November 2018
Location: 56° 33' 26.66" N, 3° 34' 45.15" W
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Project overview
| Status | Complete |
|---|---|
| Project web site | |
| Themes | Fisheries, Habitat and biodiversity, Hydromorphology |
| Country | Scotland |
| 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 |
| Partner organisations | |
| Parent multi-site project | |
| This is a parent project encompassing the following projects |
No |
Project summary
Edit project overview to modify the project summary.
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
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Lessons learnt
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Supplementary InformationEdit Supplementary Information 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.
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