Case study:Hesketh Out Marsh Managed Realignment

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Location: 53° 42' 48.02" N, 2° 50' 51.51" 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/49_hesketh.pdf
Themes	Economic aspects, Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Social benefits, Water quality
Country	England
Main contact forename	Georgina
Main contact surname	Fellows
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	RSPB, Natural England
Parent multi-site project
This is a parent project encompassing the following projects	No

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In the early 1980s, the intertidal saltmarsh habitat of Hesketh Out Marsh (Photo 1) was reclaimed from the Ribble Estuary for use as farmland (Map 1). Ownership of the land within Hesketh Out Marsh divided this enclosure into two parcels of land: Hesketh Out Marsh West (HOMW) and Hesketh Out Marsh East (HOME) (Map 2). In 2008, HOMW was reverted to intertidal saltmarsh when the Royal Society for the Protection of Birds (RSPB), in partnership with the Environment Agency, breached the outer flood embankment of this western half (HOMW). This breaching was possible by building a north–south cross-embankment separating the two parcels of land. Those works not only created 168ha of habitat – a nature reserve, owned and managed since by the RSPB – but also realigned the coastal margin for a more natural, robust and sustainable line of coastal flood defence. The challenge was then to do the same on the east The Hesketh Out Marsh realignment creates a total of 322ha of priority saltmarsh habitat which contributes to a more robust flood defence system, providing a 1 in 200 year standard of flood protection to 143 residential properties, 3 commercial buildings and 300ha of prime agricultural land.

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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 2014 Works started Works completed Project completed Total cost category Total cost (k€) £7.2m"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Flood Defence Grant-in-Aid, RSPB, WREN, Natural England 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