Case study:Marine Colliery river blockage

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Location: 51° 43' 7.31" N, 3° 9' 45.46" W

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Project overview

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Status	Complete
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://www.groundworkwales.org.uk
Partner organisations	Natural Resources Wales
This is a parent project encompassing the following projects

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A large tree has fallen across the river channel and become trapped against the main trunk sewer that crosses the river. The branches of the trapped tree had collected a large quantity of floating debris including plywood sheet, tree branches, large items of litter, shopping trolleys, tyres, furniture and large amounts of small litter items.The build of debris had created a dam in the river channel creating an impassable barrier to fish migration and a major eye sore in the river. An excavator was used to remove the blockage and transport 8 tonnes of rubbish from the site. Removing the blockage has made over 5km of the River Ebbw accessible to migrating salmon. The salmon now have access to some excellent spawning habitats upstream of the obstruction.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Marine Colliery WFD water body codes GB109056032900 WFD (national) typology WFD water body name Ebbw R - source to conf Ebbw Fach R 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 Yes Species of interest Dominant hydrology Dominant substrate River corridor land use 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 Average channel gradient Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 3030 m <br />0.03 km <br />3,000 cm <br /> Project started 2015/08/26 Works started Works completed Project completed 2016/09/14 Total cost category Less than 1 k€ 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 Less than 1 k€ Groundwork Wales Hywel Abbott Stakeholder engagement and communication Less than 1 k€ Groundwork Wales Hywel Abbott Works and works supervision Less than 1 k€ Groundwork Wales Hywel Abbott Post-project management and maintenance Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Biology Moderate Physico-chemical Other reasons for the project Poor aesthetics Measures Edit Measures Structural measures Bank/bed modifications Excavator used to remove blockage 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