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 187 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 occur 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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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

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Scotland RBD River basin Dee (Scotland) Subcatchment River name Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Dominant land cover Waterbody ID Site Edit site 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 UK - National Parks, Special Area of Conservation"UK - National Parks, Special Area of Conservation" is not in the list (All - multiple designations across the site, International - Biosphere Reserves, International - Geoparks, International - RAMSAR site, International - World Heritage Site, EU - Biogenetic Reserves Network, EU - European Diploma Site, EU - Special Area of Conservation, EU - Special Protected Area, EU - WFD protected area (drinking water, shellfish etc.), ...) of allowed values for the "Site designation" property. Local/regional site designations National Reserve 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 Edit project background 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 The James Hutton Institute Stephen Addy Reasons for river restoration Edit reasons for restoration 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, lampreys, Atlantic salmon Physico-chemical Nutrient concentrations Other reasons for the project Demonstrate this type of restoration to river managers Measures Edit Measures Structural measures Bank/bed modifications Re-profiling, construction of bunds, small wooden revetments to prevent excessive bank erosion Floodplain / River corridor Creation of backwater structures, Creation of wetlands, Construction of perimeter fence to exclude cattle Planform / Channel pattern Re-meandering of main stream Other The meanders were cleared of sediment, vegetation and organic debris Non-structural measures Management interventions Social measures (incl. engagement) Other A information board has been erected at the site Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Flow velocities Yes Yes No Yes Yes Awaiting results Quantity & dynamics of flow Yes Yes No Yes No Awaiting results Width & depth variation Yes Yes No Yes Yes Awaiting results Substrate conditions Yes Yes No Yes Yes Awaiting results Continuity of sediment transport Yes Yes No Yes No Awaiting results 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 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 Nutrient concentrations Yes Yes No Yes Yes Awaiting results 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.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 Edit Supplementary Information