Case study:Weir upstream of Redbridge roundabout

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Location: 51° 35' 5.72" N, 0° 2' 27.58" E

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Project overview

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Status	Planned
Project web site
Themes	Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Rebecca
Main contact surname	O’Shea
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

Eel trap monitoring before the project

Project summary

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To remove the existing notched weir and regrade the bed to establish more natural processes on this stretch of river and improve marginal vegetation/ habitat as a result. This in turn will benefit fauna dependent on marginal and aquatic habitats and fish passage will be unrestricted. This length of river is largely owned by the EA and was straightened to accommodate the M11 and North Circular improvements. The channel was over-sized channel with flood embankments on both sides set back a few metres from the “first stage” riverbanks. The weir may have been installed to reduce the gradient. These channel modifications have resulted in a degraded stretch river in terms of both ecology and geomorphology.

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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, Land opposite Wanstead Park, River Roding at Ray Lodge Park, Valentines Park 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) Project started 2008/01/01 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 Barriers to fish migration, Flood risk management Hydromorphology Width & depth variation Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Weir removal 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