Case study:Charlton St Peter A 8

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Location: 51° 18' 21.85" N, 1° 49' 42.27" W

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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 Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this 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) 202202 m <br />0.202 km <br />20,200 cm <br /> 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 Edit 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 Edit project background Reach length directly affected (m) 19451,945 m <br />1.945 km <br />194,500 cm <br /> Project started 2009/01/01 Works started Works completed Project completed Total cost category Total cost (k€) 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 Edit reasons for 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 Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information