Case study:River Dart (Totnes) hydropower

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Location: 50° 26' 19.90" N, 3° 41' 25.66" W

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Project overview

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Status	Planned
Project web site
Themes	Hydropower
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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Totnes broad and long weir historically directed flow into a mill leat. At the northern end of the weir a pool-and-transverse type fish pass is currently in a state of disrepair and is supplied with an excessive flow rate to facilitate fish movement. A proposal is currently being considered to install a hydropower scheme on part of the existing weir structure comprising a pair of Archimedean screw turbines. The scheme would also encompass an additional Larinier type fish pass, alongside the repair of the existing pool-and-traverse fish pass. Underwater cameras and a fish counter would estimate Salmon and Trout migration to spawning grounds in the Upper Dart. The weir itself currently has an uneven crest which would be repaired by installing a plate to the crest to improve the direct flow of water over the weir. The electrical generation will be used by the King Edward VI Community College, which is one of the largest schools in Devon. A small classroom complex is proposed for the site next to the weir to be used by a KEVICC educational trust. The project cost is estimated to be in the region of £1 million.

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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 South West River basin South Devon Subcatchment River name Dart Area category 100 - 1000 km² Area (km2) Maximum altitude category 200 - 500 m Maximum altitude (m) 477477 m <br />0.477 km <br />47,700 cm <br /> Dominant geology Siliceous Ecoregion Great Britain Dominant land cover Improved grassland Waterbody ID GB108046008350 Site Edit site Name Totnes weir WFD water body codes WFD (national) typology WFD water body name Pre-project morphology Low gradient passively meandering, Broad and long weir 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 Broadleaf/mixed woodland (semi natural), Intensive agriculture (arable), Urban 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 more than 10000 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 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 weir/hydropower Hydromorphology Continuity for organisms Biology Fish, Invertebrates Physico-chemical Other reasons for the project hydropower generation Measures Edit Measures Structural measures Bank/bed modifications existing pool-and-traverse fish pass repair/alteration and new Larinier fish pass Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Local college (King Edward VI) will be powered by hydropower scheme Other Building classroom next to project site as part of KEVICC educational project 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 references: MannPower Consulting Ltd (2011. Hydropower installation at Totnes project proposal. MannPower Consulting:York.