Case study:River Stour at Glen's weir (Throop fisheries)

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Location: 50° 45' 33" N, 1° 49' 57" W
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Project overview

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Status Complete
Project web site
Themes Fisheries
Country England
Main contact forename Matt
Main contact surname Carter
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
Completed project (Environment Agency, River Stour report doc, 2011)

Project summary

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The works completed by the Environment Agency contributed to the Stour achieving good ecological status under the Water Framework Directive. Aims were to:

-increase flow and natural scouring, to encourage self-cleaning of gravels

-enhance existing spawning areas up and downstream of Glens Weir

-increase parr and barbell habitat

-re-instate collapsed banks, re-profile weir pool to increase pool habitats

-provide fly refuge area

-reduce cattle poaching

Dredging in the 1970’s removed thousands of tonnes of gravel to reduce flood risk. This eliminated large areas of spawning habitat for many species of fish. In some places the river has re-naturalised, however routine dredging still takes place downstream as part of the Christchurch flood alleviation scheme. The project aimed to provide new spawning habitat in a previously dredged area. The location was selected based on data gathered by the Environment Agency, The Barbel Society and Ringwood & District Angling Association. Pre-project monitoring work was completed, with post-project monitoring taking place with the help of the RDAA and Barbel Society through catch data, electrofishing and red count data. Around 600 tonnes of Portland stone was used to complete the works; bank stabilisation, old weir structure, flow deflectors and in channel re-profiling. The area was also fenced to prevent cattle poaching, with a gate to allow angler access.

The works have lead to increased flows over the spawning area, and the creation of holding features for larger adult fish. Over 100m of river habitat has been restored. In the past the Stour has often been seen as second best compared with neighbouring rivers but this is now changing.

Monitoring surveys and results

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Lessons learnt

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Image gallery

Glen's Weir (EA report, 2011)
Deflector (EA report, 2011)
Weir (EA report, 2011)

Catchment and subcatchment


River basin district South West
River basin Dorset


River name STOUR (Lower)
Area category 1000 - 10000 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 9191 m
0.091 km
9,100 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB108043011040


Name Throop fisheries at Glen's weir
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology Over-widened, Over deepened
Reference morphology Low gradient passively meandering
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 Salmon, barbel
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) 100100 m
0.1 km
10,000 cm
Project started 2011
Works started
Works completed
Project completed 2011/08/01
Total cost category
Total cost (k€)
Benefit to cost ratio
Funding sources The Environment Agency

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

Reasons for river restoration

Mitigation of a pressure Flood protection maintenance works, Barriers to fish migration
Hydromorphology Flow velocities, Channel pattern/planform
Biology Fish
Other reasons for the project


Structural measures
Bank/bed modifications Bank restoration, Construction of a deflector consisting of stones, Placement of gravels, Creation of pools and riffles
Floodplain / River corridor
Planform / Channel pattern
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other project undertaken with The Barbel Society and The Ringwood & Distric Angling Association


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 Environment Agency- Throop fisheries enhancement progress report 2011

Supplementary Information

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