Case study:Braid Burn at Inch Park

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Location: 55° 55' 46", -3° 9' 13"
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Project overview

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Status Complete
Project web site
Themes Flood risk management, Habitat and biodiversity
Country Scotland
Main contact forename Richard
Main contact surname Jeffries
Main contact user ID
Contact organisation SEPA
Contact organisation web site http://www.therrc.co.uk
Partner organisations AECOM
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Braid Burn flooding, Inch Park, March 2010

Project summary

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The artificial burn corridor had little character, with very poor habitat possessing low diversity in species. The restoration project was implemented to improve the environment on the burn corridor and reduce the risk of flooding (to a 1 in 200 year event). During a 2010 flood event the project proved to successfully limit flood waters to designated flood areas.

The works comprised a two stage flood defence scheme with the first stage being a low bund to withhold a 1 in 20 year event. The second stage works involved the construction of clay embankments and sheet pile and concrete walls clad in stone recovered from the park’s boundary wall creating 190,000m³ of flood reservoir storage.

Environmental improvements included lowering artificially raised banks and the concrete channel was replaced with sinuous meanders to restore the watercourse. Wetland areas were created to provide habitat variety.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Before works - April 2006
Opening new meanders - Jan 2009
Completed channel - Feb 2009
Two years post restoration - May 2011
Wetland area - May 2011
Wetland area in flood - March 2010
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Catchment and subcatchment

Catchment

River basin district Scotland RBD
River basin Forth

Subcatchment

River name Braid Burn
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology Siliceous
Ecoregion Great Britain
Dominant land cover
Waterbody ID



Site

Name Braid Burn
WFD water body codes 3500
WFD (national) typology Low, Small, Calcareous
WFD water body name Braid Burn (Upstream Dreghorn Barracks to Portobello)
Pre-project morphology Artificial channel, Straightened
Reference morphology Sinuous
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations Urban Wildlife Site
Protected species present No
Invasive species present Yes
Species of interest Otter (Lutra lutra)
Dominant hydrology
Dominant substrate Gravel
River corridor land use Urban, Parkland
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) 320m
0.32 km
32,000 cm
Project started 2009/01/01
Works started
Works completed
Project completed 2012/08/01
Total cost category more than 10000 k€
Total cost (k€) 40000 k€
40,000,000 €
Benefit to cost ratio
Funding sources 40000 k€ as part of a wider regeneration project

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 Flood risk management
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Embankment creation
Floodplain / River corridor Floodplain reconnection
Planform / Channel pattern Adding sinuosity
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

Link Description
http://www.therrc.co.uk/case studies/braid%20burn%20at%20inch%20park.pdf River Restoration Centre Case Study
http://www.therrc.co.uk/MOT/Final Versions (Secure)/1.10 Braid Burn.pdf River Restoration Centre Manual of Techniques (detailed technical) case study

Supplementary Information

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