Case study:River Wandle: Butter Hill Phase 1

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Location: 51° 22' 13.42" N, 0° 9' 35.44" W

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Project overview

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Status	Planned
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Dave
Main contact surname	Bartlett
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations	Wandle Trust, Wild Trout Trust, Sutton County Council
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Reduction in height of three weirs and habitat creation in preparation for the reintroduction of a population of Wandle Trout. Fish pass on Butterhill Mill. In-stream diversity, weir adjustment and habitat connectivity. Fish pass on large weir sluice. Failing WFD for fish pass due to impassible nature of the river, and the prime trout habitat in the area is currently inaccessible. A lack of native trout and suitable connected habitat. Designing for low flow and climate change. Previously deculverted and restored stretch of the Wandle ecologically isolated by the weir at Butter Hill Mill.
Possible constraints - Historic structures and urban environment
Next steps - Fish pass design to be confirmed, dates for volunteers to complete in-stream restoration. One weir still to reduce in height; Larinier fish pass needing adjustments

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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: Silt & SuDs, Wandle River Restoration Project: Hackbridge 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) 360 m0.36 km <br />36,000 cm <br /> Project started 2009/01/01 Works started Works completed Project completed Total cost category 10 - 50 k€ Total cost (k€) Benefit to cost ratio Funding sources Environment Agency, Thames Water Wandle River Restoration Fund, DEFRA 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 Hydromorphology Continuity for organisms, Quantity & dynamics of flow Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir improvement Floodplain / River corridor Planform / Channel pattern Installation of fish pass 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