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

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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

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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

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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

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Mitigation of a pressure	weir/hydropower
Hydromorphology	Continuity for organisms
Biology	Fish, Invertebrates
Physico-chemical
Other reasons for the project	hydropower generation

Measures

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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

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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File:Doc1.pdf

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Additional links and references

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Link	Description

Supplementary Information

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references: MannPower Consulting Ltd (2011. Hydropower installation at Totnes project proposal. MannPower Consulting:York.