Case study:Chester Weir Notch

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Location: 53° 11' 11.08" N, 2° 53' 12.98" W

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Project overview

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Status	Complete
Project web site
Themes	Fisheries
Country	Wales
Main contact forename	Josh
Main contact surname	Robins
Main contact user ID	User:JoshRRC
Contact organisation	Natural Resources Wales
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:LIFE Dee River
This is a parent project encompassing the following projects	No

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In partnership with the Environment Agency, the aim of the work was to improve downstream passage for young salmon and sea trout as part of the multi-million-pound LIFE Dee River project, led by Natural Resources Wales (NRW). Located at the tidal limit of the Dee, Chester weir is 150 metres in length and 3 metres high. An existing canoe and fish gate was in place in the weir crest that had not functioned for over 20 years. Prior to the work, young fish were often delayed on their downstream journey by the weir, particularly at low flows in the spring when there was not enough water to help them pass over the structure. Unable to swim over such a large man-made barrier, fish would congregate above the weir and were more vulnerable to predation from birds and larger fish. Work to dismantle the existing gate and surrounding structure was carried out during low tides by experienced local contractors, using a pontoon to transport materials across the river. A new, specially fabricated stainless-steel gate was installed which is operated by a winch on the bank, allowing it to be opened and closed easily at key periods throughout the year.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body National/international site designation Local/regional site designations Protected species present Invasive species present 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 Works completed 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor 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 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