Case study:River Ebbw Bank Stabilisation

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Location: 51° 39' 19", -3° 8' 6"
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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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Image gallery


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River ebbw 005.jpg
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Ebbw June 2005 004.jpg
Green new literature.JPG
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Catchment and subcatchment

Catchment

River basin district Severn
River basin South East Valleys

Subcatchment

River name Ebbw R - conf Ebbw Fach R to Maes-glas
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 472
472 m
0.472 km
47,200 cm
Dominant geology Siliceous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB109056026910



Site

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) 80
80 m³/s
80,000 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2) 4.2
4.2 W/m²


Project background

Reach length directly affected (m) 800
800 m
0.8 km
80,000 cm
Project started 2005/01/02
Works started
Works completed
Project completed 2005/04/03
Total cost category 10 - 50 k€
Total cost (k€) 15
15 k€
15,000 €
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
Stakeholder engagement and communication
Works and works supervision
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bank stabilisation, Bank protection
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
[[]] No No No No No

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

Supplementary Information

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