Case study:Bleinheim Palace Project

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Location: 51° 52' 39.49" N, 1° 29' 42.45" W

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Project overview

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

River Evenlode, post restoration

Project summary

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Due to their loss of spawning and nursery sites, rheophilic fish populations (especially barbel, chub and dace) the river Evenlode faced significant recruitment problems. These problems originate in the widening and dredging of the channel leaving it over-sized, with few features to provide habitat or refuge for juvenile fish. With local angling club membership dwindling, the project aimed to increase fish populations in the river through the introduction of a more diverse flow and the allowance of more frequent flooding.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Site

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Name	River Evenlode
WFD water body codes	GB106039029960
WFD (national) typology
WFD water body name	Evenlode (Bledington to Glyme confluence)
Pre-project morphology	High width:depth
Reference morphology	Sinuous, Pool-riffle
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	Quick run-off
Dominant substrate	Gravel, Sand, Cobble
River corridor land use	Extensive agriculture
Average bankfull channel width category	10 - 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	3.70 m3/s3,700 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	2000 m2 km <br />200,000 cm <br />
Project started	2005/09/01
Works started
Works completed	2006/03/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	140 k€140,000 € <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
Post-project management and maintenance
Monitoring

Reasons for river restoration

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Mitigation of a pressure
Hydromorphology	Substrate conditions, Width & depth variation, Continuity of sediment transport, Flow velocities
Biology	Fish: Species composition, Fish: Abundance
Physico-chemical
Other reasons for the project	Landscape enhancement, Recreation

Measures

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Structural measures
Bank/bed modifications	Planting, Creation of pools and riffles, Placement of spawning gravels
Floodplain / River corridor	Creation of backwater structures
Planform / Channel pattern	Channel narrowing
Other
Non-structural measures
Management interventions
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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River Evenlode, May 2006

Created side bars, May 2006

Backwater (for high water flows), May 2006

Water access for lifestock, May 2006

Spit in river, May 2006

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/evenlode blenheimpalace.pdf	River Restoration Centre Case Study

Supplementary Information

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