Case study:River Wandle Restoration Project

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Location: 51° 22' 3.71" N, 0° 9' 45.58" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring
Country	England
Main contact forename	Tim
Main contact surname	Longstaff
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site	http://www.wandletrust.org/
Partner organisations	Environment Agency, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

Carshalton arm restoration, 2010 © T. Pike, Wandle Trust

Project summary

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Delivered in three phases on the stretch of the Upper Wandle, referred to as the Carshalton arm, between two public parks, the Grove (upstream) and Wilderness Island (downstream). Phase one works comprised weir notching and the creation of woody debris habitat for fish and invertebrates. The second phase focused on further habitat enhancement and weir removal. Phase three works looking at opportunities along the wider Carshalton section and associated maintenance and monitoring of project works continues in 2012, led by the Wandle Trust.

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Image gallery

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Trout spawning on the Carshalton arm, November 2012, © T. Longstaff (Wandle Trust)

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: Butter Hill Phase 1, River Wandle: Silt & SuDs, Wandle River Restoration Project: Hackbridge Site Edit site Name Butter Hill, Carshalton WFD water body codes GB106039017640 WFD (national) typology Low, Small, Calcareous WFD water body name Wandle (Carshalton Branch at Carshalton) Pre-project morphology Over deepened, Over-widened, Ponded, Straightened Reference morphology Pool-riffle Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Protected species present No Invasive species present No Species of interest Dominant hydrology Flashy, Artificially regulated Dominant substrate Gravel, Silt, Bedrock River corridor land use Average bankfull channel width category 2 - 5 m Average bankfull channel width (m) Average bankfull channel depth category 0.5 - 2 m Average bankfull channel depth (m) Mean discharge category 1 - 10 m³/s 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) 15001,500 m <br />1.5 km <br />150,000 cm <br /> Project started 2008/01/01 Works started 2010/01/01 Works completed 2012/09/01 Project completed 2012/12/01 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 Flood risk management, Barriers to fish migration Hydromorphology Channel pattern/planform, Continuity of sediment transport, Quantity & dynamics of flow, Substrate conditions, Width & depth variation Biology Invertebrates, Fish Physico-chemical Temperature Other reasons for the project Community demand Measures Edit Measures Structural measures Bank/bed modifications Introducting large woody debris, Bank re-grading, Creation of deflectors, Removal of weirs, Habitat diversification, Restoring riparian vegetation Floodplain / River corridor Control of invasive species Planform / Channel pattern Allow future natural channel changes to occur, Assessment and monitoring program, Channel naturalisation; Creation of new meandering channel, Establishment of fish passage, Improvement of channel morphology, Removal of a weir Other Non-structural measures Management interventions Social measures (incl. engagement) Awareness campaigns, 'Trout in the Town' project raising the awareness of the river's value in schools, Citizen participation in the restoration project, Communication and dissemination program of environmental problems in the area Other Public consultation, Participation in works, Participation in maintenance 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