Case study:Wandle River Restoration Project: Hackbridge

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Location: 51° 22' 37.67" N, 0° 9' 37.40" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Social benefits
Country	England
Main contact forename	Tim
Main contact surname	Longstaff
Main contact user ID	User:Pollygwenbryant
Contact organisation	Wandle Trust
Contact organisation web site	http://www.wandletrust.org
Partner organisations	London Borough of Sutton (LBS)
Parent multi-site project	Case_study:River Wandle Restoration Project
This is a parent project encompassing the following projects	No

Hackbridge Restoration © Wandle Trust

Project summary

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This project is one of four sites delivered through the Defra Catchment Restoration Fund.

Designs were developed based on detailed 2D flood modelling undertaken in conjunction with cbec eco-engineering. Practical works were delivered during Summer 2014 with appointed contractors, Cain Bioengineering.

  The work started with the removal of old toe-boarding from around the edge of Culvers Island. The island was re-profiled with a new bank line created using hazel faggot bundles secured with chestnut stakes and backed with coir netting. Sediment from the channel was then placed behind the new bank line.  

  The weir structures either side of the island were removed and the river channel narrowed using a combination of chestnut posts and hazel faggot bundles or gabion stone.

  A causeway was built to create a backwater pond area using coir geotextile layered over a bed of stone and weighed down with gravel and sediment and planted with aquatic plants. The new island banks were re-graded to create a gradually sloped bank to which a variety of aquatic vegetation was planted with a team of 60 volunteers over three days.

  Variations in depth, width and the introduction of gravel, small boulders and Large Woody Debris have all provided a diversity of habitats and increased the flow diversity of the channel throughout the site.

Monitoring surveys and results

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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.

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 (Carshalton Branch at Carshalton) Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 160160 m <br />0.16 km <br />16,000 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039017640 Other case studies in this subcatchment: Butter Hill Phase 2, River Wandle Restoration Project, River Wandle: Butter Hill Phase 1, River Wandle: Silt & SuDs Site Edit site Name WFD water body codes GB106039017640 WFD (national) typology WFD water body name Wandle (Carshalton Branch at Carshalton) 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 2012/09/01 Works started 2015/03/01 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 Hydromorphology Quantity & dynamics of flow,  Width & depth variation Biology fish passage, fish habitat, invertebrates, plants Physico-chemical improved oxygenation Other reasons for the project enhanced aesthetics Measures Edit Measures Structural measures Bank/bed modifications Weir removal, Habitat diversification Floodplain / River corridor Marginal wetland berms created Planform / Channel pattern Increase in-channel hydromorphological diversity Other Non-structural measures Management interventions Social measures (incl. engagement) Community involvement, 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