Case study:Abbotts Hall Managed Realignment Scheme

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Location: The following coordinate was not recognized: 0.84556009184722; 51.78464759917050.The following coordinate was not recognized: 0.84556009184722; 51.78464759917050.

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Dave
Main contact surname	Smart
Main contact user ID
Contact organisation	Essex Wildlife Trust
Contact organisation web site	http://http://www.essexwt.org.uk/visitor centres nature reserves/abbotts hall farm/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Abbots Hall

Project summary

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The location of the project is in the North bank of the Salcott channel tributary of the Blackwater Estuary (Essex). The strategy was creation of new coastal (mudflat, saltmarsh, transitional grassland and grazing marsh) and freshwater habitats, together with the provision of natural flood defence. In order to achieve tidal inundation of the area available (49ha of the 85ha scheme are intertidal), five breaches were required along 3km of hard defences. The largest breach was 100m in width with a level of +1.5m OD (approximately MHWN), and the remaining four breaches between 10-20m (at higher levels). The main breach was included to moderate outflow by acting as a sill, reducing the tidal prism of the site, and controlling the phasing of exchange between Salcott Creek and the site itself. Phase 1 of the scheme was undertaken in 1996 and consisted of a regulated tidal exchange on part of the site (20ha). Pre-breach, a three year monitoring programme was undertaken to ensure appropriate scheme design for the site and to provide a baseline for determining its effects. Following realignment, a further five year monitoring programme was established to assess the effects and provide further information for the design of future schemes. Monitoring undertaken: Accretion / erosion.

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Image gallery

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The managed realignment at Abbotts Hall (shortly after first inundation;breaches circled in pink) - Google Earth derived aerial view

Water flowing into the site through the main breach (Taken by: C. Scot, ABPmer, 2004)

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 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