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	Wessex Chalkstreams Project
Contact organisation web site	http://www.wiltshirewildlife.org/what-we-do/wessexchalksstreams
Partner organisations	Wiltshire Chalk Streams, Environment Agency, Wessex Water, Natural England, Wiltshire Wildlife Trust, Chisenbury Fishing Syndicate, Cain Bio-Engineering Ltd
Parent multi-site project	Case_study:River Avon Stream project
This is a parent project encompassing the following projects	No

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).

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Image gallery

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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 (Upper) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 212212 m <br />0.212 km <br />21,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB108043022350 Other case studies in this subcatchment: Gunville Phase I, Longstreet A 91a, River Avon Habitat Enhancement, Fifield, West Amesbury Site Edit site 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 Edit project background 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 Edit reasons for restoration 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 Edit Measures 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 Edit Hydromorphological 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 Edit biological 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 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 Public use Yes Yes Improvement Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references 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-chisenbury-phase-i/ Cain Bio-Engineering Ltd - Case Study Phase I http://www.cainbioengineering.co.uk/case-studies/river-case-study-river-restoration-east-chisenbury/ Cain Bio-Engineering Ltd - Case Study Phase II Supplementary Information Edit Supplementary Information