Case study:Butter Hill Phase 2

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Location: 51° 22' 16", -0° 9' 35"
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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


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Catchment and 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) 160
160 m
0.16 km
16,000 cm
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

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

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

Mitigation of a pressure
Hydromorphology Fish Passage
Biology Fish, Invertebrates
Physico-chemical Heavy Metals
Other reasons for the project


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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative

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

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative


Monitoring documents



Additional documents and videos


Additional links and references

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Supplementary Information

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