Case study:River Avon Restoration Project

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Location: 51° 18' 25.01" N, 1° 48' 35.80" W

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/3_avon.pdf
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Water quality
Country	England
Main contact forename	Alasdair
Main contact surname	Maxwell
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The River Avon is one of the most important river systems in the UK, supporting internationally and nationally important habitats and species. The river is designated as the River Avon System Site of Special Scientific Interest (SSSI). The SSSI covers the River Avon, its major tributaries and parts of the floodplain. The River Till, a tributary of the River Wylye, is designated as a separate SSSI. Habitats associated with the river include swamp, wet woodland and wet grassland habitats. The River Avon System SSSI and River Till SSSI are also designated internationally through the Habitats Directive as a Special Area of Conservation (SAC). The SAC supports internationally rare and threatened species. The lower reaches of the River Avon and its floodplain, one of the largest expanses of unimproved floodplain grazing marsh in Britain, are designated as the Avon Valley (Bickton to Christchurch) SSSI. The area is also a Ramsar site and a Special Protection Area (SPA). It supports a complex mosaic of wetland habitats including fens, mires, wet grassland, wet woodland and unimproved floodplain grassland. Important species include populations of breeding and over-wintering wetland birds, and rare wetland plants and insects. A strategy was developed to determine the issues affecting the river's geomorphological functioning and associated condition of the various designations. Based on this strategy, the River Avon Restoration Project was developed to identify measures to restore the river on a reach-by-reach basis. The Environment Agency agreed with Natural England to undertake the more complex measures and reaches, with the Project Board supporting project partners and other interest groups to put in place less complex measures where required. The River Avon Restoration Project is primarily a catchment-scale river restoration strategy. However, some of the individual completed projects can also be considered as delivering Natural Flood Management (NFM) benefits. This is because they are principally Working with Natural Processes (WWNP), creating a more naturally connected and functioning river and floodplain.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Avon WFD water body codes WFD (national) typology WFD water body name 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) Project started 2011 Works started Works completed Project completed Total cost category Total cost (k€) £4.3m"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Wessex Flood Defence Grant-in-Aid 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 Hydromorphology Channel pattern/planform Biology Physico-chemical Other reasons for the project Landscape enhancement Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Lowering of embankments, Removal of embankments Planform / Channel pattern 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