Case study:Dunruchan Farm Peatland Restoration Project

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Location: 56° 18' 21.83" N, 3° 57' 40.28" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Water quality
Country	Scotland
Main contact forename	Laurence
Main contact surname	Belleni
Main contact user ID
Contact organisation	River Forth Fisheries Trust
Contact organisation web site	http://www.fishforth.co.uk/rfft/
Partner organisations	Scottish Government, Scottish Natural Heritage, Drummond Estates, Dunruchan Farm
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Allan Water catchment has 3 Potentially Vulnerable Areas to flood risk as determined in the National Flood Risk Assessment 2009. The scoping study for this project used hydrological modelling that identified the Knaik subcatchment as contributing on average 23% of the flood peak which occurs in the most downstream PVA in the catchment. Hillsides with fast flow pathways due to hill grips is one reason the Knaik subcatchment has such an impact on the Allan Water flood peak. The project identified an area of the Knaik subcatchment where extensive hill grips were present and work was possible. By using measures such as peat dams and wooden sediment traps, fast water conveyance was attenuated and the blanket bog habitat was restored. The Dunruchan Farm Peatland Restoration Project restored 48.2ha of extensively drained upland blanket bog at just under 300m altitude by using approximately 790 peat dams, 10.4km (10,365m) ditch and gully reprofiling, 6 wooden sediment traps, one 10m bund, 30m worth of in-ditch bunds and 7 plastic dams. Research opportunities to look into the impact of the project on downstream flood risk and wider ecosystem benefits are currently being investigated. The Knaik subcatchment covers 39km² while the restored area is 0.482km² (1.2%), and so the effect may only be local. If the project's impact is considered as part of a wider network of NFM measures in the Allan Water catchment, however, the cumulative impact may be more significant.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name River Knaik, Allan Water WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Dominant substrate River corridor land use Average bankfull channel width category Average bankfull channel width (m) Average bankfull channel depth category Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started 2015 Works started Works completed Project completed Total cost category Total cost (k€) £37k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Scottish Natural Heritage, Scottish Government Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Stakeholder engagement and communication Works and works supervision Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Surface drainage systems improved Non-structural measures Management interventions Social measures (incl. engagement) Other 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 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 Supplementary Information Edit Supplementary Information