Case study:River Kennet Restoration at Durnsford

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Location: 51° 25' 4.44" N, 1° 30' 27.86" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
Country	England
Main contact forename	Judy
Main contact surname	England
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Natural England
Parent multi-site project
This is a parent project encompassing the following projects	No

Overwide section immediately upstream of where works were completed. Courtesy of Google Earth (2013)

Project summary

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Restoration measures implemented along a 2000m section included profile regrading, introduction of large woody debris, removal of invasive species, placement of gravels, cutting trees back, re-connection to adjacent floodplain, creation of wetlands and narrowing of the channel to reintroduce sinuousity.

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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 Kennet and Pang Subcatchment River name Middle Kennet (Marlborough to Newbury) Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 264264 m <br />0.264 km <br />26,400 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB106039023172 Other case studies in this subcatchment: Eastridge Estate restoration project, Habitat Improvement: Stonebridge River Reserve, Og and Marlborough Fish Migration Site Edit site Name Denford Common WFD water body codes GB106039023172 WFD (national) typology WFD water body name Pre-project morphology Straight, Embanked, High width:depth Reference morphology Pool-riffle, Sinuous Desired post project morphology Heavily modified water body Yes National/international site designation Local/regional site designations Area of Special Conservation Interest Protected species present No Invasive species present No Species of interest Dominant hydrology Quick run-off Dominant substrate Cobble, Estuarine mud, Silt River corridor land use Extensive agriculture Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category 5 - 10 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) 9.759.75 m³/s <br />9,750 l/s <br /> Average channel gradient category Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 2000 m2 km <br />200,000 cm <br /> Project started 2009/10/01 Works started Works completed 2010/03/01 Project completed 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 Invasive species Hydromorphology Flow velocities, Substrate conditions, Channel pattern/planform, Continuity for organisms Biology Fish: Species composition, Fish: Abundance, Invertebrates Physico-chemical Other reasons for the project Recreation, Habitat enhancement Measures Edit Measures Structural measures Bank/bed modifications Regrading, Removal of invasive species, Cut back of trees, Depth variation, Introducing large woody debris, Introduction of gravel Floodplain / River corridor Connection to wider floodplain, Creation of wetland Planform / Channel pattern Channel narrowing, Adding sinuosity Other Non-structural measures Management interventions Management of organic and inorganic sediments Social measures (incl. engagement) Improved public access 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 Flow velocities Yes Yes Awaiting results Substrate conditions Yes Yes Awaiting results Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Fish: Abundance Yes Yes Improvement Fish: Species composition Yes Yes Improvement Invertebrates Yes Yes 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 Supplementary Information Edit Supplementary Information