Case study:River Wandle Restoration Project

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Location: 51° 22' 3.71" N, 0° 9' 45.58" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring
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	Environment Agency, Wild Trout Trust
Parent multi-site project
This is a parent project encompassing the following projects	No

Carshalton arm restoration, 2010 © T. Pike, Wandle Trust

Project summary

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Delivered in three phases on the stretch of the Upper Wandle, referred to as the Carshalton arm, between two public parks, the Grove (upstream) and Wilderness Island (downstream). Phase one works comprised weir notching and the creation of woody debris habitat for fish and invertebrates. The second phase focused on further habitat enhancement and weir removal. Phase three works looking at opportunities along the wider Carshalton section and associated maintenance and monitoring of project works continues in 2012, led by the Wandle Trust.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Subcatchment:Wandle Other case studies in this subcatchment: River Wandle: Butter Hill Phase 3

Site

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Name	Butter Hill, Carshalton
WFD water body codes	GB106039017640
WFD (national) typology	Low, Small, Calcareous
WFD water body name	Wandle (Carshalton Branch at Carshalton)
Pre-project morphology	Over deepened, Over-widened, Ponded, Straightened
Reference morphology	Pool-riffle
Desired post project morphology
Heavily modified water body	Yes
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	No
Species of interest
Dominant hydrology	Flashy, Artificially regulated
Dominant substrate	Gravel, Silt, Bedrock
River corridor land use
Average bankfull channel width category	2 - 5 m
Average bankfull channel width (m)
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category	1 - 10 m³/s
Mean annual discharge (m3/s)
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	15001,500 m <br />1.5 km <br />150,000 cm <br />
Project started	2008/01/01
Works started	2010/01/01
Works completed	2012/09/01
Project completed	2012/12/01
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

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Mitigation of a pressure	Flood risk management, Barriers to fish migration
Hydromorphology	Channel pattern/planform, Continuity of sediment transport, Quantity & dynamics of flow, Substrate conditions, Width & depth variation
Biology	Invertebrates, Fish
Physico-chemical	Temperature
Other reasons for the project	Community demand

Measures

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Structural measures
Bank/bed modifications	Introducting large woody debris, Bank re-grading, Creation of deflectors, Removal of weirs, Habitat diversification, Restoring riparian vegetation
Floodplain / River corridor	Control of invasive species
Planform / Channel pattern	Allow future natural channel changes to occur, Assessment and monitoring program, Channel naturalisation; Creation of new meandering channel, Establishment of fish passage, Improvement of channel morphology, Removal of a weir
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)	Awareness campaigns, 'Trout in the Town' project raising the awareness of the river's value in schools, Citizen participation in the restoration project, Communication and dissemination program of environmental problems in the area
Other	Public consultation, Participation in works, Participation in maintenance

Monitoring

Hydromorphological quality elements

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quality elements

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

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
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Physico-chemical quality elements

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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

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

Monitoring documents

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Image gallery

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Trout spawning on the Carshalton arm, November 2012, © T. Longstaff (Wandle Trust)

Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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