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	Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
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

The Logie Burn before (left; upstream end of first meander looking downstream) and after (right; same section of first meander)

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 are related to agricultural and drainage improvement over many decades that have also led to a deterioration of water quality in Loch Davan into which the Logie Burn flows.

During the 1960s, two meanders in a lower part of the channel were cut-off through the creation of a straight 180 m reach leading to a localised loss of morphological and habitat diversity. The restoration project aimed to re-connect the two old meanders that had filled in with fine sediment and organic material but which essentially remained intact. 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. It is expected that the reconnected meanders and newly created backwaters will help to capture nutrient rich fine sediment and in turn reduce its transfer into Loch Davan.

A monitoring program conducted by the James Hutton Institute, commenced in July 2011 to assess how the morphology, 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 morphological changes observed. In 2012, a control reach upstream was established to facilitate comparison of changes in the impact (re-meandered) reach with those that occurred within the existing, degraded stream.

The River Restoration Centre would like to thank Estelle Gill and Stephen Addy, from Scottish Natural Heritage and The James Hutton Institute respectively, for providing the information and photographs for this case study.

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	Logie Burn
WFD water body codes	23372
WFD (national) typology	Mid-altitude, Small, Calcareous
WFD water body name	Logie Burn / Loch Davan
Pre-project morphology	Straightened, Single channel
Reference morphology	Low gradient passively meandering, Single channel
Desired post project morphology
Heavily modified water body	No
National/international site designation
Local/regional site designations	National Reserve, National Park, SAC
Protected species present	Yes
Invasive species present	No
Species of interest	Brook lamprey, Atlantic salmon (Salmo salar), Brown trout (Salmo trutta)
Dominant hydrology
Dominant substrate	Fines, fine gravel, organic material
River corridor land use	Improved/semi-improved grassland/pasture, Broadleaf/mixed woodland (semi natural)
Average bankfull channel width category	5 - 10 m
Average bankfull channel width (m)	5.65.6 m <br />0.0056 km <br />560 cm <br />
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)	0.480.48 m <br />4.8e-4 km <br />48 cm <br />
Mean discharge category	0.1 - 1.0 m³/s
Mean annual discharge (m3/s)
Average channel gradient category	Less than 0.001
Average channel gradient	0.0016
Average unit stream power (W/m2)	3.44 3.44 W/m² <br />

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
Nutrient concentrations	No	Yes	No	Yes	No

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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July 2011

August 2011

October 2011

May 2012

June 2012

October 2012

July 2011

August 2011

October 2011

October 2012

July 2011

August 2011

October 2011

April 2011

November 2012

Additional documents and videos

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Additional links and references

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Link	Description
http://www.hydrology.org.uk/assets/2012%20papers/Addy 01.pdf	Addy, S.; Ghimire, S. and Cooksley, S. (2012) Assessment of the multiple benefits of river restoration: the Logie Burn meander reconnection project
http://www.snh.gov.uk/news-and-events/press-releases/press-release-details/?id=648	Scottish Natural Heritage (2012) Logie Burn back to its meandering ways
http://http://www.therrc.co.uk/2012%20Conference/Outputs/Gill%20Final.pdf	Gill, E.; Cooksley, S.; Janes, M. and Reid, C. (2012) The Logie Burn Restoration Project: In the RRC 13th Annual Conference

Supplementary Information

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