Case study:Logie Burn Restoration Project: Difference between revisions

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{{Project overview
{{Project overview
|Status=Complete
|Status=Complete
|Themes=Habitat and biodiversity, Hydromorphology, Monitoring
|Themes=Flood risk management, Habitat and biodiversity, Hydromorphology, Monitoring, Water quality
|Country=Scotland
|Country=Scotland
|Main contact forename=Estelle
|Main contact forename=Estelle
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|Project picture=Logie Burn (before and after) II.jpg
|Project picture=Logie Burn (before and after) II.jpg
|Picture description=The Logie Burn before (left; upstream end of first meander looking downstream) and after (right; same section of first meander)
|Picture description=The Logie Burn before (left; upstream end of first meander looking downstream) and after (right; same section of first meander)
|Project summary=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.
|Project summary=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.  


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.
During the 1960s, two meanders in a lower part of the channel were cut-off through the straightening of a 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 programme 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.
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 accordingly, for providing the information and photographs for this case study.
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.
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{{Case study subcatchment}}

Revision as of 14:58, 15 March 2013

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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 straightening of a 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
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
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


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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