Case study:River Wandle: Butter Hill Phase 1

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Location: 51° 22' 5.14" N, 0° 9' 43.56" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	England
Main contact forename	Bella
Main contact surname	Davies
Main contact user ID
Contact organisation	Wandle Trust
Contact organisation web site	http://www.wandletrust.org
Partner organisations	Wandle Trust, Wild Trout Trust, Environment Agency, London Borough of Sutton
Parent multi-site project	Case_study:River Wandle Restoration Project
This is a parent project encompassing the following projects	No

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Project summary

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This Project is part of a larger scheme with the overall aim of establishing a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years. For more background on this larger scheme, please refer to the parent project "River Wandle Restoration Project".

This project was delivered in three phases working with the Environment Agency, the Wild Trout Trust and local volunteers.   The first phase involved lowering three small weirs, which were a potential barrier to fish trying to move upstream to spawn, and restoring the natural flow of the river in this section.

The second phase involved a ‘Practical Visit’ from the Wild Trout Trust through which Wandle Trust staff and over 50 volunteers were trained in simple river enhancement techniques. Woody debris was secured in the channel to vary the flow and create local scour on the river bed, increasing habitat diversity. Cover logs were raised off the riverbed and anchored to enable fish to take cover underneath when vegetation is sparse in winter.

The final phase incorporated the Environment Agency installing a Larinier fish pass on the large 1.8 m high weir at Butter Hill.

Monitoring surveys and results

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Please see the parent project (River Wandle Restoration Project) for the final results on this work, combined with the other phases.

Lessons learnt

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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 2010/01/01 Works completed 2011/12/31 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 modification Floodplain / River corridor Planform / Channel pattern Creation of fish passes 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