Case study:Mains of Dyce

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Location: 57° 12' 49", -2° 11' 22"
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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.

Monitoring surveys and results

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Lessons learnt

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Catchment and 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

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

Reach length directly affected (m) 165
165 m
0.165 km
16,500 cm
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

Mitigation of a pressure culverted channel
Hydromorphology
Biology
Physico-chemical
Other reasons for the project housing development


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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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