Case study:Burn of Balmaleedy Restoration, Marykirk

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Location: 56° 46' 50.60" N, 2° 30' 28.16" W

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Project overview

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Status	In progress
Project web site
Themes	Flood risk management
Country	Scotland
Main contact forename	Richard
Main contact surname	Bryan
Main contact user ID	User:Rbryan
Contact organisation	Aberdeenshire Council
Contact organisation web site	http://www.aberdeenshire.gov.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Looking downstream on realigned section of the Burn of Balmaleedy

Project summary

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This is a summary of a project undertaken by Aberdeenshire Council to restore a section of the Burn of Balmaleedy, upstream of the village of Marykirk. The restoration aims to restore the natural fluvial morphology of the section of the burn to reduce sediment mobilisation and transport, bringing benefits for flood management in the local area.

The Burn of Balmaleedy is a small tributary of the River North Esk. The burn flows roughly 3km southwest from its source into Marykirk, where it passes through two culverts under the A937. It then flows a further 1km along a low gradient section to the south to join the main river. From anecdotal evidence, a 300m section of the watercourse was previously straightened in the mid-late 1990’s. The canalised section of the burn exhibited a steep gradient, accelerating flows through the reach, resulting in channel incision (down to a depth of 3m) and bank erosion. This led to an increased amount of sedimentation occurring downstream in Marykirk, particularly around the A937 culverts and in the low gradient section of the watercourse. As a result, the conveyance of the channel has been greatly reduced, increasing flood risk in Marykirk and to the A937.

The project aims are:

    •	To restore the natural fluvial morphology of a previously straightened 300m section of the Burn of Balmaleedy
    •	To reduce the mobilisation and downstream transportation of sediment 
    •	To reduce flood risk in and around Marykirk  

The Burn of Balmaleedy Restoration Project has been undertaken by Aberdeenshire Council. SEPA's Water Environment Fund has also contributed to the problem by providing some of the funding.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present Species of interest Dominant hydrology Dominant substrate 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) Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 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 Supplementary Information Edit Supplementary Information