Case study:Old Station Beat restoration, River Test at Bossington

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Location: 51° 4' 20", -1° 30' 36"
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Project overview

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Status Complete
Project web site
Themes Environmental flows and water resources, Fisheries, Habitat and biodiversity, Hydromorphology, Monitoring
Country England
Main contact forename Peter
Main contact surname Easton
Main contact user ID User:Cain Bio-Engineering
Contact organisation Cain Bio-Engineering Ltd
Contact organisation web site http://www.cainbioengineering.co.uk/
Partner organisations Environment Agency, Bossington Estate, Natural England
Parent multi-site project

Case_study:Test and Itchen River Restoration Strategy

This is a parent project
encompassing the following
projects
No
Clean gravels and excellent spawning habitat after channel narrowing ©RRC June 2014

Project summary

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The River Test is a chalk stream renowned worldwide for its excellent trout fly fishing. The reaches of the Test flowing through the Bossington Estate have been dredged and impounded by weirs leaving them wide, deep and silty with resulting low velocities and poor fish stocks.

Cain Bio-Engineering Ltd. produced designs for the five reaches that flow through the Bossington Estate. In partnership with the Estate and the Environment Agency, Cain Bio-Engineering Ltd. supervised the installation, based on 450m of channel narrowing on the Old Station Beat. The restoration was constructed using a variety of techniques, including woody deflectors and gravel fronted berms.

Monitoring surveys and results

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The restored reach provides a range of flow velocities and habitats with a reported increase in wild brown trout and a reduction in the Estate’s necessity to stock. The pre and post-restoration macro-invertebrate communities have been monitored by Southampton University, with results expected in Autumn 2014.

Lessons learnt

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Image gallery


River Test - Bossington Estate (before 1) ©Cain Bio-Engineering Ltd.
River Test - Bossington Estate (after 1) ©Cain Bio-Engineering Ltd.
River Test - Bossington Estate (before 2) ©Cain Bio-Engineering Ltd.
River Test - Bossington Estate (after 2) ©Cain Bio-Engineering Ltd.
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Catchment and subcatchment

Catchment

River basin district South East
River basin Test and Itchen

Subcatchment

River name River Test
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 180
180 m
0.18 km
18,000 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB107042022740



Other case studies in this subcatchment: Improving conservation condition of the National Trust managed river test SSSI


Site

Name Old Station Beat
WFD water body codes GB107042022740
WFD (national) typology
WFD water body name River Test
Pre-project morphology Impounded, Over deepened, Over-widened, Ponded
Reference morphology Run-glide, Sinuous
Desired post project morphology Run-glide, Sinuous
Heavily modified water body No
National/international site designation
Local/regional site designations SSSI (Site of Special Scientific Interest)
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology
Dominant substrate
River corridor land use
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) 450
450 m
0.45 km
45,000 cm
Project started
Works started
Works completed
Project completed
Total cost category 10 - 50 k€
Total cost (k€) 40
40 k€
40,000 €
Benefit to cost ratio
Funding sources Environment Agency, Bossington Estate

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Environment Agency/ Geodata
Stakeholder engagement and communication Environment Agency
Works and works supervision Cain Bio-Engineering Ltd.
Post-project management and maintenance Bossington Estate
Monitoring Southampton University



Reasons for river restoration

Mitigation of a pressure Impoundments (not hydropower)
Hydromorphology Quantity & dynamics of flow, Width & depth variation
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Bed raising
Floodplain / River corridor Floodplain reconnection
Planform / Channel pattern Channel narrowing
Other Fish habitat restoration
Non-structural measures
Management interventions More sensitive channel maintenance
Social measures (incl. engagement)
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

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Supplementary Information

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