Case study:River Avon at East Chisenbury

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Location: 51° 16' 12.00" N, 1° 48' 32.36" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Monitoring, Social benefits, Spatial planning
Country	England
Main contact forename	John
Main contact surname	Rattray
Main contact user ID
Contact organisation	Wiltshire Wildlife Trust
Contact organisation web site
Partner organisations	Wiltshire Chalk Streams, Environment Agency, Wessex Water, Natural England, Wiltshire Wildlife Trust, Chisenbury Fishing Syndicate, Cain Bio-Engineering Ltd
This is a parent project encompassing the following projects

Restored channel - berm feature installed to narrow channel. Courtesy of the River Restoration Centre.

Project summary

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The River Avon and its major tributaries are recognised as a Special Area of Conservation for their rare habitats and species, including flowing water vegetation (eg. ranunculus and water-crowfoot), Atlantic salmon, Bullhead, brook and sea lamprey, water vole and otter.

The restoration project at East Chisenbury is part of the Wessex Chalk Streams PRoject (WCSP), which began in 1999 - a partnership between the Wiltshire Wildlife Trust, Natural England, the Environment Agency, Wessex Water and the Wiltshire Fishery Association. the project is focused on restoring river and wetland habitat, while helping to achieve targets under the Wiltshire & Swindon and Wessex Water Biodiversity Action Plans (BAPs).

The project at East Chisenbury was completed in two phases:

• Phase 1 (2005): Trial project to restore a 70m reach below Compton Bridge which had been subject to heavy dredging - Total Cost: £30,000.

• Phase 2 (2009): Restoration of a 650m reach upstream of Compton Bridge. Involved use of successful 'coir net' technique to re-introduce sinuosity and hydromorphological function to the overwide channel.

• Further information regarding aims, objectives, project successes and pre/post restoration project photos are available in the attached Wessex Chalk Streams Project report (see bottom of page).

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)

Catchment

River basin district	South West
River basin	South Devon

Subcatchment

River name	Avon
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	500 - 1000 m
Maximum altitude (m)	513513 m <br />0.513 km <br />51,300 cm <br />
Dominant geology	Siliceous
Ecoregion	Great Britain
Dominant land cover	Improved grassland
Waterbody ID	GB108046004940

Site

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Name	East Chisenbury
WFD water body codes	GB108043022350
WFD (national) typology	Low, Medium, Calcareous
WFD water body name	Hampshire Avon (East)
Pre-project morphology	High width:depth, Single channel
Reference morphology	Sinuous, Pool-riffle
Desired post project morphology
Heavily modified water body	Yes
National/international site designation	EU - Special Area of Conservation
Local/regional site designations	SSSI (Site of Special Scientific Interest)
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Quick run-off, Groundwater
Dominant substrate	Gravel
River corridor land use	Extensive agriculture, Urban
Average bankfull channel width category	5 - 10 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)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	720 m0.72 km <br />72,000 cm <br />
Project started	2005/01/01
Works started	2006/01/01
Works completed	2009/01/01
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	120 k€120,000 € <br />
Benefit to cost ratio
Funding sources	Wessex Chalk Streams Project, Environment Agency

Cost for project phases

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

Reasons for river restoration

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Mitigation of a pressure	Flood defence
Hydromorphology	Width & depth variation, Flow velocities, Substrate conditions, Channel pattern/planform
Biology	Fish: Abundance, Invertebrates: Abundance, Macrophytes
Physico-chemical
Other reasons for the project	Bank erosion, Habitat enhancement

Measures

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Structural measures
Bank/bed modifications	Introduction of LWD, Deflectors, Tree works, Bed raising using hurdle, Marginal planting
Floodplain / River corridor	Reconnection to the riparian zone
Planform / Channel pattern	Narrowing, Introduction of LWD deflectors
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
Width & depth variation		Yes	Yes			Improvement
Flow velocities		Yes	Yes			Improvement
Substrate conditions		Yes	Yes			Improvement

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
Fish: Abundance	Yes	Yes		Yes		Improvement
Macrophytes	Yes	Yes		Yes		Improvement
Invertebrates: Abundance	Yes	Yes		Yes		Improvement

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
Public use		Yes	Yes			Improvement

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://publications.environment-agency.gov.uk/pdf/GESW0910BSTR-E-E.pdf	WFD Status for Hampshire Avon (Middle) - See P. 1308.
http://www.youtube.com/watch?v=4goBfNnmS4s	Youtube Video: Wessex Chalk Streams Project
http://www.cainbioengineering.co.uk/case-studies/river-case-study-river-restoration-east-chisenbury/	Cain Bio Engineering - Case Study

Supplementary Information

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