Case study:Land opposite Wanstead Park

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Location: 51° 34' 22.82" N, 0° 2' 38.16" E

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Project overview

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Status	Planned
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	David
Main contact surname	Watts
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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Realigning of the flood bund against the A406 to reconnect the Roding with 12 Ha of its floodplain and to create wetland features. The past positioning of a bund adjacent to the Roding as a flood defence measure has resulted in the river being detached from its natural floodplain. An area of approx. 6Ha of allotments lies landward of the bund of this 500m stretch. It is proposed to remove this bund and reposition it adjacent to the A406 embankment thus reinstating this 6Ha as functional floodplain.
Flood capacity would be increased as a result of the scheme. This should not pose an issue from a flood risk perspective as these features lie predominately in the floodplain currently unutilised for flooding episodes therefore minimal maintenance of this habitat should not affect the current level of protection. Effective design should ensure the proposals remain a valuable wildlife resource for as long a time period as possible. This project should have priority as it highlighted in the Roding FRM Strategy.

Contamination is unknown. However it can be assumed that the flood bund is of sound, clean material and the first stage of the project could be to simply move the bund. It ties in with the extension of the Roding Valley Way footpath/ cycle path, which LB Redbridge is keen to push. Meetings have already been held. Part of the 12 Ha is a football pitch used by local schools, the use of this would need to be respected.

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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 Roding, Beam and Ingrebourne Subcatchment River name Roding (Cripsey Brook to Loxford Water) Area category 100 - 1000 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 124124 m <br />0.124 km <br />12,400 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB106037028180 Other case studies in this subcatchment: Chigwell Brook, Fresh Wharf, River Roding at Ray Lodge Park, Valentines Park, Weir upstream of Redbridge roundabout Site Edit site Name WFD water body codes GB106037028180 WFD (national) typology WFD water body name Roding (Cripsey Brook to Loxford Water) 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) 500 m0.5 km <br />50,000 cm <br /> Project started 2008/01/01 Works started Works completed Project completed Total cost category 500 - 1000 k€ 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 Flood risk management, Riparian development Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Bund removal, Creation of wetland 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