Case study:Merton Abbey Mills Eel Pass

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Location: 51° 24' 44", -0° 11' 7"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Habitat and biodiversity
Country England
Main contact forename Bella
Main contact surname Davies
Main contact user ID
Contact organisation Wandle 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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To monitor elvers reaching Merton Abbey Mills; to install an elver pass on the side of the weir which most elvers use Tilting weir presents a complete barrier to fish passage, likely including eels

Monitoring surveys and results

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Eel pass installed using a design that incorporating an eel trap for monitoring purposes - pass is already being used.

Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Wandle (Croydon to Wandsworth) and the R. Gravney
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 282
282 m
0.282 km
28,200 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039023460



Other case studies in this subcatchment: Beddington Park, Beddington Park Enhancements, Boulder Pool and Plough Lane, Durand Close, EDF Weir removal, Eel Pass over tilting weir at Ravensbury Park, Garratt Park, Hackbridge Restoration, Hackbridge weir notch, King Georges Park... further results


Site

Name
WFD water body codes GB106039023460
WFD (national) typology
WFD water body name Wandle (Croydon to Wandsworth) and the R. Gravney
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) 20 m
0.02 km
2,000 cm
Project started 2010/01/01
Works started
Works completed 2010/01/01
Project completed
Total cost category 10 - 50 k€
Total cost (k€)
Benefit to cost ratio
Funding sources ART/EA; ZSL Wandle Trust; ZSL

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 Fish
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern Eel pass installation
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other Monitoring and survey projects


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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