Case study:Plough Lane weir removal

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Location: 51° 26' 2.19" N, 0° 11' 26.53" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Flood risk management, Habitat and biodiversity
Country	England
Main contact forename	Tanya
Main contact surname	Houston
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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Primary objectives - Reprofile reach, improve instream diversity, naturalise the flow regime, introduce a pool-riffle sequence and reduce the backwater effect. Secondary objectives include to narrow the river channel, manage flood risk, improve water quality, introduce gravels and woody debris, improve fish stocks and passage for fish and eel. Complete removal of a weir on Plough Lane, and enhancement works.

Monitoring surveys and results

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Photographs pre-works
Fisheries survey
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Lessons learnt

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Outlined hydromorph and ecological objectives set. Seen to have a beneficial impact on reach profile, water level, flood risk, instream diversity, flow regime, spawning habitats and macrophytes/phytobenthos. Extremely positive impact on reducing the backwater effect, and in improving fish stocks and passage.

Image gallery

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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 Wandle (Croydon to Wandsworth) and the R. Gravney Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 282282 m <br />0.282 km <br />28,200 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039023460 Other case studies in this subcatchment: Beddington Park, Beddington Park Enhancements, Boulder Pool and Plough Lane, Durand Close, EDF Weir removal, Eel Pass over tilting weir at Ravensbury Park, Garratt Park, Hackbridge Restoration, Hackbridge weir notch, King Georges Park... further results Site Edit site Name WFD water body codes GB106039023460 WFD (national) typology WFD water body name Wandle (Croydon to Wandsworth) and the R. Gravney 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 2010/01/01 Works started Works completed 2010/01/01 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 Biology Fish Physico-chemical Nutrient concentrations Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Introducing large woody debris, Introduction of gravel Floodplain / River corridor Planform / Channel pattern Creation of pools and riffles 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