Case study:Merdian Water development site

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Location: 51° 36' 44.71" N, 0° 3' 5.13" W

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Project overview

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Status	Planned
Project web site
Themes	Economic aspects, Flood risk management, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	John
Main contact surname	Bryden
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations
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 development of the site is hugely constrained by flood risk, the development should removal all concrete banks and fully restore the channel, through this there is significant opportunity to reduce the risk of flooding to the surrounding areas, thereby enabling development. The areas which do flood can provide significant amenity and recreational value to the public. Site is current a poorly used industrial site, its outlined for development of 5,000 homes in the Enfield Local Development Framework, as part of the London, Stanstead, Cambridge Growth Area. The Pymmes and Salmons Brook confluence is located in the development, and the Lee Navigation runs through the centre of the site with the Lee Flood Relief Channel on the eastern boundary. All of the rivers are in poor condition and generally have concrete banks.

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Thames River basin London Subcatchment River name Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk) Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 131131 m <br />0.131 km <br />13,100 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106038027940 Other case studies in this subcatchment: Arnos Park - Pymmes Brook, Friary Park, Friern Barnet Former Sewage Works, Parks between A10 and Melville Gardens, Pymmes Brook and new river crossing point, Weir removal at Tile Kiln Park, Wilmer Way School Playing Field Site Edit site Name WFD water body codes GB106038027940 WFD (national) typology WFD water body name Pymmes Brook (upper channel with Muswell St & Bounds Grn Brk) 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) 3000 m3 km <br />300,000 cm <br /> Project started Works started Works completed Project completed Total cost category Total cost (k€) Benefit to cost ratio Funding sources Redevelopment of the surrounding area (106 agreements), Community Infrastructure Levy. 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 risk management, Urbanisation Hydromorphology Biology Physico-chemical Other reasons for the project Recreation Measures Edit Measures Structural measures Bank/bed modifications Removing of concrete structures Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Aesthetics 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