Case study:Sandwich Tidal Defence Scheme

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/55_sandwich.pdf
Themes	Estuary, Flood risk management, Habitat and biodiversity, Marine
Country	England
Main contact forename	Sandwich Town
Main contact surname	Defences Scheme
Main contact user ID
Contact organisation	Sandwich Town Defences Scheme
Contact organisation web site	http://www.gov.uk/government/publications/sandwich-town-tidal-defences/sandwich-town-tidal-defences
Partner organisations	Environment Agency, Kent County Council, Pfizer
Parent multi-site project
This is a parent project encompassing the following projects	No

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Sandwich is a historic town and civil parish on the right bank of the River Stour in Kent (Map 1). A major inundation in the Sandwich and Deal area occurred in January 1953 when a North Sea surge – 4.7m Ordnance Datum (OD) at Pegwell Bay – caused the banks of the River Stour to overtop and breach, resulting in extensive flooding. A surge event occurred in 1976, estimated 1 in 25 (4% annual exceedance probability, AEP) and again in 1983, estimated 1 in 10 to 1 in 5 (10% to 20% AEP), causing flooding at Sandwich Quay with 16 properties suffering direct flooding. A scheme was constructed in 2015 to reduce the risk of flooding to the local community and businesses.

The scheme provided a 1 in 200 standard of protection to both banks with 50 years of sea level rise included in the design. This protects 486 homes and 94 commercial properties in Sandwich (Photo 1). It cost £21.7 million, with £11.5 million provided in partnership funding from Kent Country Council and Pfizer.

The scheme consisted of 14.4km of strengthening and improving the existing tidal river defences, and creation of a 240ha tidal flood relief area between Sandwich and the mouth of the River Stour. Part of this enabled the creation of 20ha of new Biodiversity Action Plan (BAP) habitat, which includes a mosaic of wetland habitats.

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Location: 51° 17' 24.62" N, 1° 22' 28.21" E

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 2013 Works started Works completed Project completed Total cost category Total cost (k€) £21.7m"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Flood Defence Grant-in-Aid, Pfizer, Kent County Council 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 Salt marsh and mudflat restoration 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