Case study:River Avon Stream project

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Location: 50° 48' 40", -1° 48' 32"
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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

Catchment

River basin district South West
River basin Hampshire Avon

Subcatchment

River name Hampshire Avon (Lower)
Area category 1000 - 10000 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 152
152 m
0.152 km
15,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Improved grassland
Waterbody ID GB108043015840



Other case studies in this subcatchment: Salisbury Avon Restoration Project, Salmonid, coarse fish and wetland bird habitat and flood plain linkage project, Hampshire Avon, Strategic Framework for Restoration of the River Avon (SFfRRA)


Site

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

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 €
Benefit to cost ratio
Funding sources European Commission, Heritage Lottery Fund (HLF), EU LIFE Programme

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

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

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


Monitoring

Hydromorphological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
[[]]

Biological 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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
[[]]

Any other monitoring, e.g. social, economic

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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