Case study:Water Quality Restoration River Dun- Canal Bypass Weirs

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Location: 51° 24' 26.41" N, 1° 33' 55.42" W

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Project overview

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Status	Complete
Project web site
Themes	Economic aspects, Environmental flows and water resources, Fisheries, Hydromorphology, Land use management - agriculture, Social benefits, Water quality
Country	England
Main contact forename	Oda
Main contact surname	Dijksterhuis
Main contact user ID
Contact organisation	British Waterways (BW) - now The Canal and River Trust (CRT)
Contact organisation web site
Partner organisations	Environment Agency (West Thames), Natural England, Action for the River Kennet (ARK), All part of the Kennet Catchment Partnership Group
Parent multi-site project
This is a parent project encompassing the following projects	No

A new bypass weir (Canal and Rivers Trust)

Project summary

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The Kennet and Avon canal and the River Dun run parallel and in a number of places use the same channel and connect via overspill weirs. There have been concerns about the condition of the River Kennet and the associated impact of canal water on the ecology of the Rivers Dun and Kennet. Poor water quality is caused by diffuse pollution, nutrient enrichment and slow flowing water. Objectives: From upstream to downstream, bypass weir structures adjacent to seven locks along the Kennet and Avon canal to improve water quality and environmental enhancement within the River Dun catchment (including the River Kennet and the Kennet & Avon Canal). This will effectively retain the turbid water in the canal avoiding discharge to the river. The project will result in a reduction of canal & river interaction in the Dun valley, reducing the impacts of rural diffuse pollution within the River Kennet SSSI and River Dun part of Freemans Marsh SSSI over several miles of watercourse. It will also contribute towards achieving good ecological status of the Rivers Dun and Kennet (currently moderate), particularly for fish, with the benefits particularly evident during early spring and throughout the summer when river ecology is at its most sensitive.

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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 Kennet and Avon Canal and Dun above Hungerford Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 176176 m <br />0.176 km <br />17,600 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB106039017390 Site Edit site Name WFD water body codes GB106039017390 WFD (national) typology WFD water body name Kennet and Avon Canal and Dun above Hungerford Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No National/international site designation UK - Site of Special Scientific Interest 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 Edit project background Reach length directly affected (m) 60006,000 m <br />6 km <br />600,000 cm <br /> Project started 2012/07/01 Works started Works completed Project completed 2015/03/01 Total cost category 1000 - 5000 k€ Total cost (k€) 1,2201,220 k€ <br />1,220,000 € <br /> Benefit to cost ratio Funding sources Defra Catchment Restoration Fund, Canal and River Trust funding 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 Pollution incident Hydromorphology Quantity & dynamics of flow Biology Fish, Invertebrates, Vertebrates, Macrophytes Physico-chemical Nutrient concentrations Other reasons for the project Suspended solids and algae Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Diversion of water flow Non-structural measures Management interventions Social measures (incl. engagement) Improved public access Other Economic benefits 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 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 RRC Monitoring table - River Dunn Additional documents and videos Upload additional documents CRF Project briefing note - River Dunn Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information