Case study:River Marden at Calne

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Location: 51° 26' 17.13" N, 2° 0' 15.09" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management, Habitat and biodiversity, Social benefits
Country	England
Main contact forename	Paul
Main contact surname	Jolliffe
Main contact user ID
Contact organisation	Nicholas Pearson Associates
Contact organisation web site	http://www.npaconsult.co.uk/
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

Plan of restored reach

Project summary

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Following the demolition of a town centre factory, the River Marden through Calne flowed in a straight concrete channel and two small weirs barred the passage of fish. Urban regeneration, and the resultant redevelopment of the site, meant that the river had to be diverted south of its existing course and the opportunity was taken to improve the character of the river and create a public amenity.

The diversion was undertaken in the form of a double meander so that natural geomorphological features such as shoals, riffles and pools could be incorporated, along with public access to the river and the creation of a variety of sustainable, attractive habitats for flora and fauna.

The scheme has been a success and the river is now a focal point of the town and the centerpiece for the towns annual duck race!

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Site

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Name	River Marden at Calne
WFD water body codes	GB109053022060
WFD (national) typology
WFD water body name
Pre-project morphology	Straightened, Artificial bed
Reference morphology	Bedrock cascade, Sinuous
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
Dominant substrate	Chalk
River corridor land use	Urban
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

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Reach length directly affected (m)	100100 m <br />0.1 km <br />10,000 cm <br />
Project started	1999/03/01
Works started
Works completed
Project completed	1999/09/30
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

Supplementary funding information

Exact costs for the project are not available but would have been "considerable" given the works required

Reasons for river restoration

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Mitigation of a pressure	Urbanisation
Hydromorphology	Channel pattern/planform, Quantity & dynamics of flow
Biology	Fish
Physico-chemical
Other reasons for the project	Community demand, access to the river, urban regeneration/development

Measures

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Structural measures
Bank/bed modifications	Bedrock cascades and outcrops, Creation of pools and riffles, Creation of shoals/berms
Floodplain / River corridor	Public access to the river
Planform / Channel pattern	Remeandering, weir removal
Other	Replacement existing culvert with twin culvert
Non-structural measures
Management interventions
Social measures (incl. engagement)	Improved public access, Focal point for local events
Other

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
	Before measures	After measures	Qualitative	Quantitative
Fish	No	Yes	Yes	No	No	Improvement

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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River Marden before restoration looking downstream

River Marden before restoration looking upstream

Re-meandered channel and riverside access - 2012

Scheme holding up well in floods - 2012

Calne charity duck race - 2007

Additional documents and videos

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Additional links and references

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Link	Description
http://www.therrc.co.uk/pdf/manual/MAN 1 5.pdf	RRC Manual of River Restoration Techniques entry - Creation of meandering channel and replacement of concrete weirs
http://www.therrc.co.uk/pdf/manual/MAN 5 4.pdf	RRC Manual of River Restoration Techniques entry - Installation of simulated bedrock outcrops
http://www.therrc.co.uk/pdf/manual/MAN 8 5.pdf	RRC Manual of River Restoration Techniques entry - Urban riverside access

Supplementary Information

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