Case study:Inchewan Burn Bed restoration

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Location: 56° 33' 26.66" N, 3° 34' 45.15" W

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Project overview

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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

The restored Inchewan Burn

Project summary

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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.

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Image gallery

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The restored burn

The degraded reno mattresses

Low flow in the old wire bed

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Tay River basin Inchewan Subcatchment River name Inchewan Burn Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Urban, Woodland Waterbody ID Site Edit site Name Birnam WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Single channel, Straight, Embanked, Revetments Reference morphology Step-pool, Pool-riffle, Single channel Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present Yes Invasive species present No Species of interest atlantic salmon (Salmo salar) Dominant hydrology Quick run-off Dominant substrate Bedrock River corridor land use Urban, Woodland Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s Mean annual discharge (m3/s) Average channel gradient category 0.01 - 0.1 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 100 m0.1 km <br />10,000 cm <br /> Project started 2007/09/01 Works started Works completed 2007/11/01 Project completed Total cost category 50 - 100 k€ Total cost (k€) 100 k€100,000 € <br /> Benefit to cost ratio Funding sources Scottish Environment Protection Agency, Perth Council, Scottish Natural Heritage Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Perth Council John Monteith Stakeholder engagement and communication Perth Council John Monteith Works and works supervision Perth Council Post-project management and maintenance Perth Council Monitoring Perth Council John Monteith Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Hydromorphology Quantity & dynamics of flow, continuity of sediment transport, Flow velocities Biology Restore free passage for fish and promote fish spawning (ie. salmonids). Physico-chemical Other reasons for the project Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications Removal of artificial wire/stone bed, Replicated upstream boulder bed step/pool sequence 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 Other Non-structural measures Management interventions Social measures (incl. engagement) Student Education Other Local support Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish No Yes Yes No No Improvement Physico-chemical quality elements Edit Physico-chemical quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Any other monitoring, e.g. social, economic Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description http://www.therrc.co.uk/rrc case studies1.php?csid=52 River Restoration Centre Case Study http://www.therrc.co.uk/case studies/sepa article inchewan%20burn.pdf SEPA article http://www.therrc.co.uk/2012%20Conference/Outputs/Gilvear%202%20Final.pdf Inchewan Burn Post Project Appraisal: David Gilvear's presentation from the RRC 2012 Conference Supplementary Information Edit 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.