Case study:Rhymney Great Wharf

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Location: 51° 29' 58.35" N, 3° 5' 24.59" 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/57_rhymney.pdf
Themes	Flood risk management, Habitat and biodiversity
Country	Wales
Main contact forename	Huw
Main contact surname	Alford
Main contact user ID
Contact organisation	Natural Resources Wales
Contact organisation web site	http://naturalresources.wales/?lang=en
Partner organisations	Atkins
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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The Severn Estuary foreshore has international importance, reflected by the following designations: Site of Special Scientific Interest (SSSI), Special Protection Area (SPA), possible Special Area of Conservation (pSAC) and Ramsar. The site itself is located seaward of the Wentlooge Sea Defences, where the upper, vegetated saltmarsh is referred to as the 'wharf' and the lower unvegetated foreshore as the 'mudflats'. The Wentlooge Sea Defences (Map 1) protect an area of low-lying land, of which approximately 32km2 lies below mean high water springs (MHWS). The wharf acts as part of the sea defence by reducing the incident wave energy on the embankments themselves. Study of the foreshore highlighted that the wharf had been eroding locally at a fairly constant rate over a long period. In 2003, pockets of erosion were in close proximity to the flood defence embankment and as such continued erosion was predicted to undermine the embankment by the year 2008. As an immediate mitigation against further erosion of the wharf, thus protecting the defences, it was decided to use harder, more traditional engineering in the form of blockstone and rip-rap. As a longer term strategy, polder were used in an effort to regenerate the mudflats and increase protection to the wharf scarp. The works that were carried out have effectively stopped/slowed the erosion of the wharf, thus: • maintaining the ecologically important land • preventing the undermining of the defences and maintaining their function • protecting ~30km2 of agricultural land, business and numerous communities within the Wentlooge Levels

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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 Works started Works completed Project completed Total cost category Total cost (k€) £1.6m"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Welsh Government 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