Case study:Alkborough tidal defence scheme

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Project overview

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Status	Complete
Project web site	http://www.environment-agency.gov.uk/research/planning/108978.aspx
Themes	Flood risk management, Social benefits
Country	England
Main contact forename	Volker
Main contact surname	Stevin
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site
Partner organisations	Natural England, Associated British Ports, North Lincolnshire Council, Department for Environment, Food and Rural Affairs (Defra), Yorkshire Forward, Heritage Lottery Fund, European Union (EU)
Parent multi-site project
This is a parent project encompassing the following projects	No

Alkborough area

Project summary

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Alkborough Flats are on the south bank of the Humber Estuary, on the eastern side of the confluence between the River Trent and the River Humber. The site is around 440 hectares of agricultural land, of which approximately 375 hectares are protected by a flood embankment constructed in the late 1950s. The Alkborough tidal defence scheme increases the level of flood protection to an area stretching from the Humber Bridge to Goole up the tidal River Ouse and as far as Keadby Bridge on the tidal River Trent. The scheme features include a 20 metre-wide breach of the existing flood bank, a 1,500 metre length of lowered embankment or spillway and a new section of floodbank to protect assets at the edge of the site. The scheme has been designed to: reduce the impact of sea level rise; safeguard the internationally important nature conservation interest of the Humber by creating new wetland habitat; provide a focus for education and access opportunities for local communities.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Alkborough 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 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 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