Case study:Hesketh Out Marsh Managed Realignment

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Location: 53° 42' 48", -2° 50' 52"
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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
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Project summary

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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



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
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Protected species present
Invasive species present
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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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
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Works and works supervision
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Reasons for river restoration

Mitigation of a pressure Flood and coastal erosion protection
Hydromorphology
Biology
Physico-chemical
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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

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Before measures After measures Qualitative Quantitative

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Monitoring documents



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Supplementary Information

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