Case study:The Taw River Improvement Project (TRIP)

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Location: 51° 4' 38", -4° 10' 0"
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Project overview

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Status In progress
Project web site
Themes Fisheries, Flood risk management, Habitat and biodiversity, Land use management - agriculture, Water quality
Country England
Main contact forename Laurence
Main contact surname Couldrick
Main contact user ID
Contact organisation North Devon Biosphere Reserve, Westcountry Rivers Trust
Contact organisation web site http://www.wrt.org.uk/
Partner organisations Farming and Wildlife Group South West, Devon Wildlife Trust, Silvanus
This is a parent project
encompassing the following
projects
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Project summary

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TRIP is a partnership project that will use CRF funds to manage restoration work to deliver habitat improvements in the Taw catchment. The partnership, led by the Westcountry Rivers Trust, has been carrying out river restoration and addressing the causes of Water Framework Directive issues together for many years.

The outcomes of the project are the following:

  • Water quality management – More con-sistent supply of better water quality;
  • Improved biodiversity - increased hab-itat biodiversity and renaturalisation;
  • Social - Improved leisure environment for angling and recreation;
  • Economic - Improved fisheries and spawning for commercial stocks;
  • Flood attenuation and management - Increased wetted and wooded areas; Counteract climate change - Carbon sequestration through wetland sinks.

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 North Devon

Subcatchment

River name TAW / TORRIDGE
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion Great Britain
Dominant land cover
Waterbody ID GB540805015500



Site

Name Taw river catchment
WFD water body codes GB540805015500
WFD (national) typology
WFD water body name TAW / TORRIDGE
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 No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use Intensive agriculture (arable)
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 2012/07/01
Works started
Works completed
Project completed 2015/03/31
Total cost category 1000 - 5000 k€
Total cost (k€) 2332
2,332 k€
2,332,000 €
Benefit to cost ratio
Funding sources Catchment Restoration Funds

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 Barriers to fish migration, Flood risk management
Hydromorphology Continuity for organisms, Structure & condition of riparian zones
Biology Fish
Physico-chemical Nutrient concentrations
Other reasons for the project Economic, Social, Climate change mitigation


Measures

Structural measures
Bank/bed modifications Marginal planting, Gravel augmentation
Floodplain / River corridor Creation of a flood expansion area
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Improved leisure environment for angling and recreation
Other Participation in works


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

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Supplementary Information

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