Case study:Bowston Weir Removal

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Location: 54° 21' 51.71" N, 2° 46' 31.47" W

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Project overview

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Status	In progress
Project web site
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits
Country	England
Main contact forename	Peter
Main contact surname	Evoy
Main contact user ID	User:South Cumbria Rivers Trust
Contact organisation	South Cumbria Rivers Trust
Contact organisation web site	http://scrt.co.uk
Partner organisations
Parent multi-site project	Case_study:Cumbria River Restoration Strategy
This is a parent project encompassing the following projects	No

Bowston weir removal

Project summary

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Bowston weir is the first weir to be removed on the River Kent Site of Special Scientific Interest and Special Area of Conservation (SSSI/SAC). Bowston weir removal forms part of the Cumbria River Restoration Strategy (CRRS) which aims to restore the three Cumbrian SSSI/SAC rivers to their natural form and function and help them achieve Favourable Condition.

Monitoring surveys and results

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1. Baseline data includes fish surveys and other ecological parameters, topographical and bathymetrical surveys, drone surveys and walk over fluvial audits. 2. Post-removal data collection continued immediately after the weir removal to track the immediate change in river processes and hydrological conditions. 3. Continued collection and analysis following geomorphologically effective flow events has provided valuable monitoring data to identify positive changes in the river dynamics, improved sediment flux through the system, enhancement to the now varied ecosystem.

Lessons learnt

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SCRT created a Local Community Engagement Plan with local representatives which explained how, what and when we would communicate with local stakeholders and the public. This was extremely effective in setting out our engagement responsibilities and ensured a standardised approached to our communications.

Image gallery

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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 Kent & Leven River basin North West Subcatchment River name River Kent Area category Area (km2) Maximum altitude category Maximum altitude (m) Dominant geology Ecoregion Dominant land cover Waterbody ID Other case studies in this subcatchment: Lake District Foundation - Building future environmental investment Site Edit site Name Bowston weir WFD water body codes GB531207312000 WFD (national) typology Estuarine WFD water body name River Kent Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body Yes National/international site designation EU - Special Area of Conservation Local/regional site designations SSSI (Site of Special Scientific Interest) Protected species present Yes Invasive species present No Species of interest white-clawed crayfish (Austropotamobius pallipes), Freshwater pearl mussel (Margaritifera margaritifera), bullhead (Cottus gobio), water crowfoot (Ranunculus aquatilis), water-milfoil (Myriophyllum alterniflorum), reed canary-grass (Phalaris arundinacea) 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) 10001,000 m <br />1 km <br />100,000 cm <br /> Project started 2016/06/16 Works started 2022/06/20 Works completed 2022/07/19 Project completed 2020/09/30 Total cost category 1000 - 5000 k€ Total cost (k€) Benefit to cost ratio Funding sources Cumbria River Restoration/European Regional Development Fund Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design 5000 - 10000 k€ Stakeholder engagement and communication 1000 - 5000 k€ Works and works supervision more than 10000 k€ Post-project management and maintenance more than 10000 k€ Monitoring 5000 - 10000 k€ Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration, Flood risk management, Navigation Hydromorphology Continuity of sediment transport, Continuity for organisms, Freshwater flow regime, Channel pattern/planform, Quantity & dynamics of flow Biology Fish, Invertebrates: Diversity Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications removal of dams, Rock ramp construction Floodplain / River corridor Planform / Channel pattern Channel naturalisation Other Non-structural measures Management interventions Social measures (incl. engagement) Engagement with a wide range of stakeholders 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 Channel pattern/planform Yes Yes Yes Yes No Improvement Continuity of sediment transport Yes Yes Yes Yes No Improvement Quantity & dynamics of flow Yes Yes Yes Yes No Improvement Continuity for organisms No Yes No Yes No 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 [[]] No No No No No 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 Flood risk management Yes Yes Yes Yes No Improvement Bat Survey Yes No No No No Awaiting results Bathymetric Survey Yes Yes Yes Yes No Improvement general assessment of habitat quality and diversity (repeat photography) Yes No No No No Awaiting results 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