Case study:Logie Burn Restoration Project

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Location: 57° 5' 48.29" N, 2° 55' 19.68" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
Country	Scotland
Main contact forename	Estelle
Main contact surname	Gill
Main contact user ID
Contact organisation	Scottish Natural Heritage
Contact organisation web site	http://www.snh.gov.uk/
Partner organisations
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 Logie Burn is graded as poor for its ecological status due to diffuse sediment and nutrient inputs in addition to morphological alteration. These issues account for agricultural and drainage demand over many decades. To begin with, the Logie Burn was canalized and dredged of original bed material. Two meanders were cut-off as part of the engineering works for straightening and deepening the burn. In particular, straightening of the Logie burn had adverse effects on in-stream diversity and lowered the burn’s ability to filter out silt being carried downstream.

This project targeted 160 m reach of the Logie Burn and included the re-connection of the two old meanders that were previously sealed off from the main channel. The primary purposes of the re-connection were to restore morphology, improve habitat quality in the National Nature Reserve, improve water quality and reduce sedimentation in loch Davan, enhance riparian habitat diversity and demonstrate this meander restoration to river managers. Enhancement of in-channel nutrient storage also contributed to reduce fine sediment and nutrient(particularly P)transfer into Loch Davan.

A monitoring programme commenced in July 2011 to assess how the geomorphology, habitat, phosphorous storage and the flood attenuation capacity of the reach change over time. Topographical and sedimentary surveys were undertaken before and after the re-connection and will be repeated annually. In addition, stream flow is being continuously monitored to allow assessment of the flood attenuation capacity and to help understand the geomorphic changes observed.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name
WFD water body codes	23372
WFD (national) typology	Mid-altitude, Small, Calcareous
WFD water body name	Logie Burn / Loch Davan
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations	National Reserve
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Artificially regulated
Dominant substrate	Fines, fine gravel, organic material
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)	1.61.6 m³/s <br />1,600 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	250250 m <br />0.25 km <br />25,000 cm <br />
Project started
Works started	2011/09/09
Works completed	2011/10/15
Project completed
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources	Scottish Environment Protection Agency, Scottish Natural Heritage.

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

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Mitigation of a pressure	Land drainage
Hydromorphology	Continuity for organisms, Continuity of sediment transport, Quantity & dynamics of flow, Structure & condition of riparian/lake shore zones, Substrate conditions
Biology	Macrophytes
Physico-chemical	Nutrient concentrations
Other reasons for the project	Demonstrate this type of restoration to river managers

Measures

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Structural measures
Bank/bed modifications	Re-profiling, Revetmens with local species
Floodplain / River corridor	Creation of backwater structures, Creation of wetlands, Construction of perimeter fence was constructed to exclude cattle
Planform / Channel pattern
Other	The meanders were cleared of sediment, vegetation and organic debris
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Continuity of sediment transport	No	Yes	No	Yes	No

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Fish	No	Yes	Yes	No	No

Physico-chemical quality elements

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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

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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