Case study:River Dart (Totnes) hydropower

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Location: 50° 26' 20", -3° 41' 26"
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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
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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.

Community Involvement:
- Local college (King Edward VI) will be powered by hydropower scheme
- Building classroom next to project site as part of KEVICC educational project

Monitoring surveys and results

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Lessons learnt

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Catchment and 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) 477
477 m
0.477 km
47,700 cm
Dominant geology Siliceous
Ecoregion Great Britain
Dominant land cover Improved grassland
Waterbody ID GB108046008350



Site

Name Totnes weir
WFD water body codes GB108046008350
WFD (national) typology
WFD water body name DART
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

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

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


Measures

Structural measures
Bank/bed modifications Larinier fish pass, Creation of fish passes, Creation of fish passes
Floodplain / River corridor
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Student Education, Engagement with schools
Other


Monitoring

Hydromorphological quality elements

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

Biological quality elements

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

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

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


Monitoring documents



Additional documents and videos


Additional links and references

Link Description

Supplementary Information

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