Case study:River Ebbw Bank Stabilisation

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Location: 51° 39' 18.52" N, 3° 8' 5.89" W

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Project overview

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Status	Complete
Project web site	http://salixrw.com/project/river-ebbw-bank-stabilisation
Themes
Country	Wales
Main contact forename	David
Main contact surname	Holland
Main contact user ID
Contact organisation	Salix River & Wetland Services Limited
Contact organisation web site	http://www.salixrw.com
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Following restoration

Project summary

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This project aimed to stabilise a highly erodible bank consisting mainly of colliery shale by using a green, visually appealing method. Rock rolls and live willow bundles (faggots) were placed to protect toes. The upper bank was protected using high performance erosion control mats and native willow cutting. Locally occurring riverside grasses and rushes were planted to revegetate the marginal areas.

The River Restoration Centre would like to thank David Holland from Salix River & Wetland Services Limited for providing the information and photographs for this case study.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name	River Ebbw
WFD water body codes	GB109056026910
WFD (national) typology	Mid, Medium, Siliceous
WFD water body name	Ebbw R - conf Ebbw Fach R to Maes-glas
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	Yes
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	10 - 100 m³/s
Mean annual discharge (m3/s)	8080 m³/s <br />80,000 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)	4.2 4.2 W/m² <br />

Project background

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Reach length directly affected (m)	800800 m <br />0.8 km <br />80,000 cm <br />
Project started	2005/01/02
Works started
Works completed
Project completed	2005/04/03
Total cost category	10 - 50 k€
Total cost (k€)	1515 k€ <br />15,000 € <br />
Benefit to cost ratio
Funding sources	Merrimans Ltd

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design
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Works and works supervision
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
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Measures

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Structural measures
Bank/bed modifications	Bank stabilization and erosion protection
Floodplain / River corridor
Planform / Channel pattern
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Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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quality elements

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

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
[[]]	No	No	No	No	No

Physico-chemical quality elements

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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

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

Monitoring documents

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Image gallery

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Additional links and references

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Link	Description
http://salixrw.com/files/salixrw/case-studies/River%20Ebbw%20.pdf	Salix Case study:River Ebbw Bank Stabilisation

Supplementary Information

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