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	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, Sutton County Council, Environment Agency
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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This was the first phase in the larger River Wandle Restoration Project with the overall aim to establish a population of brown trout in the Carshalton arm of the River Wandle for the first time in over 80 years.

The overall objective of this larger project was to rehabilitate the Carshalton waterbody by improving habitat diversity and quality, fish passage, hydromorphology and water quality; with wild trout used as the indicator species for the river’s recovery.

In 2010, the gradual lowering of 3 the three stabilising weirs was undertaken in partnership with the EA to improve both fish passage and flow regime. The EA also installed a Larinier Fish Pass on a large weir at Butter Hill Bridge but due to unforeseen site restrictions the pass was ineffective without modification.

To compliment this work, the Wild Trout Trust (WTT) led a Practical Visit to enhance in-channel habitat and train Wandle Trust staff and 50 volunteers from the local community and TITT projects from around the country in river enhancement techniques. Large Woody Debris (LWD) was installed to produce good quality habitat for trout at all life stages: scoured spawning gravels, holding lies for adult trout and cover suitable for juvenile life stages of trout.

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 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