Case study:Ty Mawr

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Location: 51° 53' 41.86" N, 3° 29' 16.37" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology
Country	Wales
Main contact forename	Josh
Main contact surname	Robins
Main contact user ID	User:JoshRRC
Contact organisation
Contact organisation web site
Partner organisations
Parent multi-site project	Case_study:Four Rivers for LIFE
This is a parent project encompassing the following projects	No

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Project summary

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The scheme focussed on a stretch of the River Tarell, an important tributary of the River Usk SAC (Special Area of Conservation), and aimed to restore the river’s natural processes by re-introducing wood into the river channel.

Led by the Natural Resources Wales (NRW) Four Rivers for LIFE project and the River Restoration Centre (RRC) – the scheme is part of a wider nature restoration project by the National Trust at their site. Much of the upper part of the River Tarell catchment flows through land under National Trust ownership at their Ty Mawr Farm site in the Brecon Beacons.

The work saw 40 trees winched into a 600 metre stretch of the river channel to create 14 large wood structures. These were strategically positioned to encourage floodplain reconnection and improve habitat, whilst maintaining access for migratory fish.

The trees were wedged into the riverbank to minimise the risk of them becoming displaced during high flows. Ash dieback had affected a significant number of trees in the area, so these were the first trees to be used in the scheme.

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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 Usk Subcatchment River name Afon Tarell - source to conf R Usk Area category 10 - 100 km² Area (km2) Maximum altitude category 500 - 1000 m Maximum altitude (m) 856856 m <br />0.856 km <br />85,600 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB109056033070 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