Case study:Logie Burn Restoration Project: Difference between revisions
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|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 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 | 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 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 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. | ||
Revision as of 12:03, 13 March 2013
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Project overview
| 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
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 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.
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.
Monitoring surveys and results
Lessons learnt
Catchment and subcatchment
Site
| 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
| 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
Measures
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
| 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
| 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
| 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
| Element | When monitored | Type of monitoring | Control site used | Result | ||
|---|---|---|---|---|---|---|
| Before measures | After measures | Qualitative | Quantitative | |||
Monitoring documents
Image gallery
Additional documents and videos
Additional 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
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