Case study:Mains of Dyce

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Location: 57° 12' 49.37" N, 2° 11' 22.06" W

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Project overview

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Status	Complete
Project web site
Themes	Hydromorphology
Country	Scotland
Main contact forename	Hamish
Main contact surname	Moir
Main contact user ID
Contact organisation	cbec eco engineering
Contact organisation web site	http://www.cbecoeng.co.uk/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Mains of Dyce, newly completed. Photograph courtesy of cbec eco engineering

Project summary

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SEPA required the culverted channel to be “re-daylighted”. The overarching aim was to restore catchment scale processes as much as possible, taking a long term sustainable rather than quick fix approach. Constraints on the scale of restoration included: large housing development close by, lack of a catchment scale management plan, lack of funding and knowledge. Housing developer initially carried out works, resulting in an unstable channel design. Two one in ten year flooding events which occurred in 2009 caused severe incision of the channel up to 2.7 meters, which in total was estimated to have removed 539m3 of material. cbec eco engineering was subsequently contracted to re-design the channel. Step-pool design was chosen based on modelling. Works included bed and bank profiling, and step construction from boulders and smaller cobbles/gravels. Monitoring has indicated that channel design is stable.

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Image gallery

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district North East Scotland River basin Don Subcatchment River name Don Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Dominant land cover Intensive agriculture (arable), Improved/semi-improved grassland/pasture, Broadleaf/mixed woodland (semi natural) Waterbody ID Site Edit site Name Mains of Dyce WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Closed culvert Reference morphology Open culvert Desired post project morphology Heavily modified water body No National/international site designation Local/regional site designations Protected species present No Invasive species present No 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) 165165 m <br />0.165 km <br />16,500 cm <br /> Project started 2009/08/01 Works started Works completed Project completed 2010/09/01 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 culverted channel Hydromorphology Biology Physico-chemical Other reasons for the project housing development Measures Edit Measures Structural measures Bank/bed modifications step pool 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