Case study:Thames Lock Weir, Brentford eel pass

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Location: 51° 28' 56.16" N, 0° 18' 18.05" W

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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

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Project summary

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Facilitate the passage of elvers around Thames Lock Weir, Brentford. Hounslow Council land. 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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Lessons learnt

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Eel tiles not strictly needed, as tide over-tops weir, so the aim was to allow eels to pass when the water level is below the weir crest. No formal monitoring but no issues, so far, apart from accumulating debris (August 2013).

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this 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) 130130 m <br />0.13 km <br />13,000 cm <br /> 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 Site Edit 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 Edit project background Reach length directly affected (m) 5 m0.005 km <br />500 cm <br /> Project started 2013/01/01 Works started Works completed 2013/01/01 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 Edit reasons for restoration Mitigation of a pressure Barriers to fish migration Hydromorphology Continuity for organisms Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Weir modification Floodplain / River corridor Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Other 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 Supplementary Information Edit Supplementary Information