Case study:Kentchurch Weir Removal

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Location: 51° 55' 25.48" N, 2° 51' 0.57" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England, Wales
Main contact forename	Peter
Main contact surname	Gough
Main contact user ID
Contact organisation	Natural Resources Wales
Contact organisation web site
Partner organisations	Atkins
Parent multi-site project
This is a parent project encompassing the following projects	No

The 2 metre high Kentchurch Weir, prior to removal. Courtesy of Atkins.

Project summary

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In 2008, EA Wales and Atkins completed a project to install a fish pass at Osbaston, downstream of Kentchurch Weir - to improve fish passage upstream. However, the 2 metre high Kentchurch Weir posed as a significant and impassable barrier to fish passage further upstream. A £100,000, 18 month-long project was undertaken, beginning in 2008, to remove this structure and open up the upper reaches of the Monnow.

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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 Severn River basin Wye Subcatchment River name R Monnow - conf Afon Honddu to conf R Wye Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 423423 m <br />0.423 km <br />42,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB109055029720 Other case studies in this subcatchment: River Monnow (Going Native) Site Edit site Name Monnow at Kentchurch Weir WFD water body codes GB109055029720 WFD (national) typology Mid, Medium, Calcareous WFD water body name R Monnow - conf Afon Honddu to conf R Wye Pre-project morphology High width:depth. Significant backwater upstream of impoundment. Reference morphology Desired post project morphology Heavily modified water body No National/international site designation 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) Project started Works started 2011/08/01 Works completed 2012/08/15 Project completed Total cost category 100 - 500 k€ Total cost (k€) 120120 k€ <br />120,000 € <br /> Benefit to cost ratio Funding sources UK European Fisheries Fund Operational Programme 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 Hydromorphology Biology Good ecological status, but weir removal to improve fish passage to upper reaches. Also, to improve habitat for macrophytes and macroinvertebrates. Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir removal, Weir modification Floodplain / River corridor Improving fish migration Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) 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 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 Bathymetric Survey Yes No No Yes No Sediment Contamination Assessment Yes No No Yes No 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 Considered to be the largest ever weir removal undertaken in Wales. Removal has allowed 160km of the Monnow catchment to be restored to its natural condition of flow and connectivity.