Case study:Lower Darwen Weir Removal

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Location: 53° 42' 39", -2° 28' 25"
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Project overview

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Status Complete
Project web site
Themes Fisheries, Hydromorphology
Country England
Main contact forename Jack
Main contact surname Spees
Main contact user ID User:RRT
Contact organisation Ribble Rivers Trust
Contact organisation web site http://www.ribbletrust.org.uk
Partner organisations
This is a parent project
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Project summary

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Weir Removal to improve fish passage and Hydromorphology of a Heavily Modified Water Body in an Urban Area

Monitoring surveys and results

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100% successful fish passage has been achieved

Lessons learnt

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Catchment and subcatchment



Site

Name Darwen
WFD water body codes
WFD (national) typology
WFD water body name
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)
Project started
Works started
Works completed
Project completed
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Total cost (k€)
Benefit to cost ratio
Funding sources

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 Heavily Modified Water Body
Hydromorphology
Biology
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications Weir removal
Floodplain / River corridor
Planform / Channel pattern
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

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Physico-chemical quality elements

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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



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Supplementary Information

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