Case study:River Avon Stream project

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Location: 50° 48' 39.60" N, 1° 48' 32.40" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Monitoring, Water quality
Country	England
Main contact forename	Jenny
Main contact surname	Wheldon
Main contact user ID
Contact organisation	Natural England
Contact organisation web site
Partner organisations
This is a parent project encompassing the following projects	River Avon at East Chisenbury

Avon at Amesbury, post-restoration works in 2009

Project summary

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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	River Avon
WFD water body codes	GB108043015840
WFD (national) typology
WFD water body name	Hampshire Avon (Lower)
Pre-project morphology	Single channel, Straight, Embanked
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
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Quick run-off
Dominant substrate	Bedrock
River corridor land use	Urban, Extensive agriculture
Average bankfull channel width category	10 - 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	5 - 10 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)
Project started	2002/12/01
Works started
Works completed
Project completed
Total cost category
Total cost (k€)	1000 k€1,000,000 € <br />
Benefit to cost ratio
Funding sources	European Commission LIFE-Nature programme, Heritage Lottery Fund (HLF).

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	Reservoir impoundment
Hydromorphology	Channel pattern/planform, Width & depth variation, Quantity & dynamics of flow
Biology	Fish: Abundance, Invertebrates, Macrophytes
Physico-chemical
Other reasons for the project	Bank erosion, Habitat enhancement

Measures

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Structural measures
Bank/bed modifications	Planting, Depth variation, Soft erosion solutions, Weir removal
Floodplain / River corridor	Creation of wetlands, Connection to wider floodplain
Planform / Channel pattern	Intriduction of sinuousity
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other	Consultation, Participation in design

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
Fish: Abundance		Yes		Yes		Awaiting results
Invertebrates		Yes		Yes		Awaiting results
Macrophytes		Yes		Yes		Awaiting results

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

Supplementary Information

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