Case study:Waldringfield Flood Defence Scheme, Suffolk

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Location: 52° 3' 14.85" N, 1° 19' 49.22" E

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/58_waldringfield.pdf
Themes
Country	England
Main contact forename	Karen
Main contact surname	Thomas
Main contact user ID
Contact organisation	Water Management Alliance
Contact organisation web site	http://www.wlma.org.uk/
Partner organisations	Waldringfield Flood Defence Group, East Suffolk Internal Drainage Board, Environment Agency
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Following the tidal surge of December 2013, the businesses and residents of Waldringfield in Suffolk (Map 1) formed the Waldringfield Flood Defence Group. Working with the East Suffolk Internal Drainage Board, the Group has achieved a more resilient flood defence for the community along 1km of estuary frontage. The Group raised funds through the Coastal Communities Fund and other funding routes to pay for the works. The work began in February 2015 and consisted of 2 phases. Phase 1 (south section) involved raising the brick wall to protect village properties fronting the estuary, along with a counterwall to separate this part of the flood cell from the north section. Phase 2 (north section) involved raising and widening the clay embankment together with saltmarsh restoration. The Phase 2 design and build project aimed to create a higher wall, with a wider crest width and gentle back slope to withstand overtopping and breaching in the future. In addition, by winning all the material from the farmland behind the wall, a new freshwater wetland was created. This wetland provided delivered suitable alternative habitat for water voles within a year of its construction. The East Suffolk Internal Drainage Board also designed and delivered a saltmarsh restoration pilot as part of the scheme to add further natural flood protection to the wall. The project was officially launched on 1 December 2015 and has been praised locally as a great model of partnership working. This project is a demonstration of what can be achieved at relatively low cost on rural flood defences. Through a partnership approach incorporating both traditional and working with natural processes (WWNP) measures, significant improvements have been made to flood risk management for approximately 20 properties and a well-used public footpath, along with the creation of freshwater habitat and restoration of saltmarsh. Early monitoring results demonstrate that simple and relatively inexpensive brushwood structures can increase sediment accumulation within areas of eroded saltmarsh, providing benefits to both flood defence and habitat.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Deben Estuary 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 2015 Works started Works completed Project completed Total cost category Total cost (k€) £1.6m"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Coastal Communities Fund, Flood Defence Grant-in-Aid, Waldringfield Flood Defence Group 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 Flood and coastal erosion protection Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor 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