Case study:Clitherow's Island, Brentford eel pass

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Location: 51° 29' 30", -0° 19' 22"
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Project overview

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Status Complete
Project web site
Themes Fisheries
Country England
Main contact forename Chris
Main contact surname Cockel
Main contact user ID
Contact organisation Thames Rivers Trust
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Clitherow Island Eel Pass

Project summary

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Facilitate the passage of elvers around Clitherow's Island, Brentford. A Canal and River Trust asset. A desire to improve the River Brent in all aspects, but particularly for fish health and connectivity.

Monitoring surveys and results

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This pass cannot be monitored.

Lessons learnt

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No issues, so far, apart from accumulating debris (August 2013).


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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Brent (below Silk stream down to the Thames)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 130
130 m
0.13 km
13,000 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039023590



Other case studies in this subcatchment: Boston Manor, Brent Lodge Park Improvement, Brent River Park Phase II, Clitherow's Island, Brentford eel pass, Osterley Weir, Hanwell eel pass, Stonebridge Estate, Stoney Sluice, Brentford eel pass, Thames Lock Weir, Brentford eel pass


Site

Name
WFD water body codes GB106039023590
WFD (national) typology
WFD water body name Brent (below Silk stream down to the Thames)
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
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) 5 m
0.005 km
500 cm
Project started 2012/01/01
Works started
Works completed 2012/01/01
Project completed
Total cost category 1 - 10 k€
Total cost (k€)
Benefit to cost ratio
Funding sources DEFRA through River Improvement Fund

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
Hydromorphology Continuity for organisms
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern Creation of fish passes
Other
Non-structural measures
Management interventions
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

Link Description

Supplementary Information

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