Case study:Mill Road Weir, Pontypool

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Location: 51° 42' 38.32" N, 3° 2' 58.38" W

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Project overview

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Status	Planned
Project web site
Themes	Fisheries, Habitat and biodiversity
Country	Wales
Main contact forename	Hywel
Main contact surname	Abbott
Main contact user ID	User:Hywel Abbott
Contact organisation	Groundwork Wales
Contact organisation web site	http://groundworkwales.org.uk/
Partner organisations	Natural Resources Wales
This is a parent project encompassing the following projects

Photo of weir before work carried out

Project summary

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Healthy Rivers will install a fish pass ramp on the weir to improve fish migration upstream. Currently the weir poses a barrier to upstream fish migration particularly to smaller fish. The ramp in the centre of the weir will create an attractive flow of water and will reduce the need for migrating fish to leap out of the water to get over the weir. Healthy Rivers will also install eel mats on a wing wall beside the weir to improve access upstream for elvers.

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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 South East Valleys Subcatchment River name Afon Lwyd - source to conf Dowlais Bk Area category 10 - 100 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 575575 m <br />0.575 km <br />57,500 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Acid Grassland Waterbody ID GB109056032910 Site Edit site Name Mill Road Weir WFD water body codes GB109056032912 WFD (national) typology WFD water body name Afon Llwyd Pre-project morphology 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 Parkland and housing Average bankfull channel width category 5 - 10 m Average bankfull channel width (m) Average bankfull channel depth category Less than 0.5 m Average bankfull channel depth (m) Mean discharge category Mean annual discharge (m3/s) Average channel gradient category more than 0.1 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 1010 m <br />0.01 km <br />1,000 cm <br /> Project started 2016/01/02 Works started Works completed Project completed Total cost category 1 - 10 k€ Total cost (k€) Benefit to cost ratio Funding sources Natural Resources Wales Cost for project phases Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname Investigation and design Less than 1 k€ Groundwork Wales Hywel Abbott Stakeholder engagement and communication Less than 1 k€ Groundwork Wales Hywel Abbott Works and works supervision 1 - 10 k€ Groundwork Wales Hywel Abbott Post-project management and maintenance Natural Resources Wales Monitoring Natural Resources Wales Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barrier to fish migration Hydromorphology Heavily modified Biology poor Physico-chemical Other reasons for the project improve fish migration Measures Edit Measures Structural measures Bank/bed modifications Weir modification 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