Case study:River Dulais Restoration Project

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Location: 51° 54' 11.98" N, 3° 58' 13.08" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Wales
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations	Environment Agency Wales
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The River Dulais is typical of many local rivers, where unrestricted grazing, mostly by sheep, has resulted in a loss of bankside vegetation. Accordingly, there is reduced cover for fish, bank/bed instability and increased erosion. Traditionally, the approach was to extensively fence off rivers and introduce revetments, but this project looked to introduce the option of softer engineering and river restoration to the catchment.

A variety of techniques were used to restore the river, including bank grading and toe protection using live willow bundles. In deep stretches of the river with more powerful flow, upturned trees were installed to act as natural revetments. Trees were also planted to steady the banks, with all trees additionally providing further habitat.

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 Dulais
WFD water body codes	GB110060036210
WFD (national) typology
WFD water body name	Dulais - conf with Ddu to confluence with Tywi
Pre-project morphology
Reference morphology
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	0.01 - 0.1
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	500 m0.5 km <br />50,000 cm <br />
Project started	2004/05/01
Works started
Works completed
Project completed	2004/05/31
Total cost category	10 - 50 k€
Total cost (k€)	33 k€33,000 € <br />
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		3333 k€ <br />33,000 € <br />	Salix
Post-project management and maintenance
Monitoring

Supplementary funding information

Works split into €20k for revetment work and €13k for fencing

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Channel pattern/planform, Structure & condition of riparian/lake shore zones
Biology	Lack of vegetation, Macrophytes
Physico-chemical
Other reasons for the project	Promote soft-engineering/river restoration techniques

Measures

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Structural measures
Bank/bed modifications	Bank stabilisation
Floodplain / River corridor	Control of riparian vegetation, Creation of wetlands
Planform / Channel pattern	Channel narrowing
Other
Non-structural measures
Management interventions	Fencing
Social measures (incl. engagement)
Other

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

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 documents and videos

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Additional links and references

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Link	Description
http://www.therrc.co.uk/case studies/rrn%20issue%2023.pdf	River Restoration Centre news article

Supplementary Information

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