Case study:Eden Crayfish Restoration Project

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Location: 54° 44' 25.72" N, 2° 45' 17.36" W

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Project overview

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Status	In progress
Project web site
Themes	Economic aspects, Habitat and biodiversity, Social benefits, Water quality
Country	England
Main contact forename	Joanne
Main contact surname	Backshall
Main contact user ID
Contact organisation	Eden River Trust
Contact organisation web site	http://www.edenriverstrust.org.uk/
Partner organisations	Defra, Environment Agency
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This project will improve the habitat and water quality of rivers within the Eden catchment in Cumbria. The River Eden is of international importance for its wildlife and is designated as a Special Area of Conservation (SAC). It sup-ports many significant species including white-clawed crayfish, salmon, trout, eel, bullhead, lamprey, otter, water vole, invertebrates of river shingle and water crowfoot. The Eden is the best remaining stronghold of the endan-gered white-clawed crayfish, which is threatened and declining across the UK and Western Europe. The Eden catchment comprises 98 water bodies. Under the Water Framework Directive (WFD) classification 59% of these fail to achieve Good Ecological Status and none of them are in “high” condition. Problems within the Eden are due to agriculture, sewage, septic tanks, urbanisation, invasive species and poor quality habitats along and within rivers. The project will restore more natural features in and around rivers and reduce the impact of diffuse pollution arising from agriculture. It aims to protect and expand populations of white-clawed crayfish as well as those of other valued river species.

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	Eden River
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body	No
National/international site designation	EU - Special Area of Conservation
Local/regional site designations
Protected species present	No
Invasive species present	Yes
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use	Intensive agriculture (arable)
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

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Reach length directly affected (m)
Project started
Works started
Works completed
Project completed
Total cost category	500 - 1000 k€
Total cost (k€)	550550 k€ <br />550,000 € <br />
Benefit to cost ratio
Funding sources	Defra

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

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Mitigation of a pressure	Agriculture, Urbanisation, Sewage, Invasive species
Hydromorphology
Biology
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor	Planting, Installing riverside fencing
Planform / Channel pattern
Other	producing 20 farm assessments in areas of crayfish populations; carrying out improvement work on 20 farms to reduce diffuse pollution; carrying out instream habitat improvements at 5 locations.
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other	There will be a greater under-standing and stewardship of the river environment amongst farmers and other land owners, volunteers and the general public.

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
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Physico-chemical quality elements

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quality elements

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	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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Supplementary Information

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