Case study:Hackbridge Restoration

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Location: 51° 22' 38.43" N, 0° 9' 37.93" W

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Project overview

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Status	In progress
Project web site	http://www.wandletrust.org/wp-content/uploads/2014/07/Culvers_Island_Info_for_Website_pdf.pdf
Themes	Fisheries, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	Bella
Main contact surname	Davies
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site
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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Potential for river floodplain restoration or bank reprofiling Currently playing field/sports pitches and open grass. This project is one of four sites in the Wandle River Restoration Project being delivered through the Defra Catchment Restoration Fund. Four weirs were removed and 125m of river narrowed using bioengineering techniques. An island was regraded and a backwater created with 250 tonnes of gravel used to enhance geomorphology and habitat along with 6000 plants planted by volunteers. Designs were developed based on detailed 2D flood modelling undertaken in conjunction with cbec eco-engineering. Practical works were deliverd during summer 2014 with appointed contractors, Cain Bioengineering.

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Lessons learnt

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Challenges: - Very urban nature of the site. Complex flood modelling and design was required. - Multiple underground utilities which had to be identified and avoided during the works. - Many and varied stakeholder needs and opinions.

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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 weir notch, King Georges Park, Medland Close, River Wandle... further results 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) 50 m0.05 km <br />5,000 cm <br /> Project started 2009/01/01 Works started Works completed 2009/01/01 Project completed Total cost category 1 - 10 k€ Total cost (k€) Benefit to cost ratio Funding sources Wandle Trust, EA 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 Hydromorphology Width & depth variation Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling, Deflectors, Installation of coir rolls 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