Case study:Butter Hill Phase 2

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Location: 51° 22' 16.38" N, 0° 9' 35.03" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Social benefits, Urban
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
Parent multi-site project	Case_study:River Wandle Restoration Project
This is a parent project encompassing the following projects	No

Before and After of Restoration Works © Wandle Trust

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".

The weir at Millpond Place was notched to restore natural flow to the upstream channel.   The over-wide and straightened channel was narrowed and a new bank line created with the help of volunteers by using chestnut faggot bundles pinned into place with chestnut stakes.

Silt from the channel was then moved behind the faggot bundles to create a new bank. Brash and topsoil were added to stabilise this new bank and 1000 native aquatic plants and three planted coir rolls were installed to further stabilise it with the help of volunteers.  

Seventy tonnes of gravel were added to the newly modified channel and carefully distributed to create riffles, pools and bars giving rise to a variety of new habitat areas for fish, invertebrates and plants.   Further habitat works were carried out in channel with volunteers, adding Large Woody Debris flow deflectors to diversify the flow. Two “Dragon’s Tooth” berms were created by installing logs and brash bundles. Almost 100 volunteers were involved over several weekends.

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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- Urban nature of the site

- Getting some local, neighbouring residents to understand and buy in to the project was difficult

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: River Wandle Restoration Project, River Wandle: Butter Hill Phase 1, 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) Project started Works started 2011/01/01 Works completed 2011/10/31 Project completed 2010/10/31 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 Fish Passage Biology Fish, Invertebrates Physico-chemical Heavy Metals Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir notched, Bank reprofiling, Introduction of gravel, Introducing large woody debris, Planting of native species Floodplain / River corridor Large scale planting of native species Planform / Channel pattern Channel narrowing Other Non-structural measures Management interventions Social measures (incl. engagement) Community consultation, Community Events 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