Case study:Dunruchan Farm Peatland Restoration Project

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Location: 56° 18' 22", -3° 57' 40"
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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
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encompassing the following
projects
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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



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)
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Average bankfull channel depth (m)
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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

Mitigation of a pressure Flood risk management
Hydromorphology
Biology
Physico-chemical
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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

Element When monitored Type of monitoring Control site used Result
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Monitoring documents



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Supplementary Information

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