Case study:Charlton St Peter A 8

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Location: 51° 18' 22", -1° 49' 42"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Flood risk management, Habitat and biodiversity
Country England
Main contact forename Mike
Main contact surname Porter
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.environment-agency.gov.uk
Partner organisations
Parent multi-site project

Case_study:Strategic Framework for Restoration of the River Avon (SFfRRA)

This is a parent project
encompassing the following
projects
No
River Avon

Project summary

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This reach is located at Charlton St Peter and is 1945m in length. The reach is designated SSSI but not SAC. There is good marginal habitat along both banks due to electric fencing being used to protect the banks from livestock. The upstream end of the channel is deeply incised with low floodplain connectivity as a result; the upstream end of the reach may have been dredged in the past. Ranunculus fluitantis is prevalent when the channel opens up and is not densely shaded. There is a private fishery nearby managed by the Rushall Estate. There is evidence that the channel downstream of Charlton St Peter has been dredged. This has resulted in the formation of some high levees adjacent to the channel, which cut off the river from the floodplain and over-shades it in places.

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Catchment and subcatchment

Catchment

River basin district South West
River basin Hampshire Avon

Subcatchment

River name Hampshire Avon (West)
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 202
202 m
0.202 km
20,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB108043022370



Other case studies in this subcatchment: France Farm (Phase 1) A 9


Site

Name
WFD water body codes GB108043022370
WFD (national) typology
WFD water body name Hampshire Avon (West)
Pre-project morphology
Reference morphology
Desired post project morphology
Heavily modified water body No
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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

Reach length directly affected (m) 1945
1,945 m
1.945 km
194,500 cm
Project started 2009/01/01
Works started
Works completed
Project completed
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Cost for project phases

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



Reasons for river restoration

Mitigation of a pressure Historic flood alleviation
Hydromorphology
Biology
Physico-chemical Land drainage, Agricultural improvement
Other reasons for the project Urbanisation & development causing channelisation (deepening/widening/straightening/embanking), The use of sluice and weirs (creating barriers and flow impoundment)


Measures

Structural measures
Bank/bed modifications Bed raising, Weir modification, Weir removal
Floodplain / River corridor Remeandering, Modifying bank protection, Lowering of embankments, Riparian planting
Planform / Channel pattern Channel narrowing, Fencing, Introducing large woody debris, Enhancing flow diversity, altering flow splits, Re-instatement of old course
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


Monitoring

Hydromorphological 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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Physico-chemical quality elements

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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



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Additional links and references

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Supplementary Information

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