Case study:Brecon Weir Modification

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Status	In progress
Project web site
Themes	Fisheries, Urban
Country	Wales
Main contact forename	Josh
Main contact surname	Robins
Main contact user ID	User:JoshRRC
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Contact organisation web site
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Parent multi-site project	Case_study:Four Rivers for LIFE
This is a parent project encompassing the following projects	No

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The scheme, delivered by Natural Resources Wales’s (NRW) Four Rivers for LIFE Project, will see a new smolt (young salmon) pass installed in the weir. Brecon Weir is currently recognised as a significant obstruction to young salmon migrating downstream on their journey to the sea. Once completed, the new smolt pass will help young salmon and other fish species to move freely down the river.

Recent fish tracking work has shown that Brecon Weir can significantly delay salmon smolts on their downstream migration in the spring, especially in low flows, making them more vulnerable to disease and predation. Accumulations of smolts have been observed around the weir during spring low flows. A new smolt pass will be installed in the face of the weir which will improve the hydraulics and flow velocities for fish passing the weir. The design will include a u-shaped notch, a bell mouth pass entrance, and an approach ramp.

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Location: 51° 57' 0.11" N, 3° 23' 55.28" W

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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