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

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Location: 50° 45' 33.32" N, 1° 49' 56.84" 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 projects	No

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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Image gallery

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Glen's Weir (EA report, 2011)

Deflector (EA report, 2011)

Weir (EA report, 2011)

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 Dorset Subcatchment River name STOUR (Lower) Area category 1000 - 10000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9191 m <br />0.091 km <br />9,100 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB108043011040 Other case studies in this subcatchment: River Stour at Glen's weir (Throop fisheries) Site Edit site Name Throop fisheries at Glen's weir WFD water body codes GB108043011040 WFD (national) typology WFD water body name STOUR (Lower) 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 Edit project background Reach length directly affected (m) 100100 m <br />0.1 km <br />10,000 cm <br /> Project started 2011 Works started Works completed Project completed 2011/08/01 Total cost category Total cost (k€) Benefit to cost ratio Funding sources 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 Monitoring Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood protection maintenance works, Barriers to fish migration Hydromorphology Flow velocities, Channel pattern/planform Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank improvement, Creation of gravel deflectors, Creation of pools and riffles, Introduction of gravel Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other project undertaken with The Barbel Society and The Ringwood & Distric Angling Association 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 http://www.environment-agency.gov.uk/static/documents/Leisure/Throop Fisheries Enhancement PR.pdf Environment Agency- Throop fisheries enhancement progress report 2011 Supplementary Information Edit Supplementary Information