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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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

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Severn River basin Bristol Avon and North Somerset Streams Subcatchment River name R Marden - conf Abberd Bk to conf unnamed trib Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 114114 m <br />0.114 km <br />11,400 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB109053022060 Site Edit site Name River Marden at Calne WFD water body codes GB109053022060 WFD (national) typology WFD water body name R Marden - conf Abberd Bk to conf unnamed trib 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 Edit project background 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 Edit reasons for restoration 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 Edit Measures 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 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 Fish No Yes Yes No No Improvement 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 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 Edit Supplementary Information