Case study:Kentchurch Weir Removal

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Location: 51° 55' 25.48" N, 2° 51' 0.57" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation	River Restoration Centre
Contact organisation web site
Partner organisations	Environment Agency Wales, Atkins
Parent multi-site project
This is a parent project encompassing the following projects	No

The 2 metre high Kentchurch Weir, prior to removal. Courtesy of Atkins.

Project summary

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In 2008, EA Wales and Atkins completed a project to install a fish pass at Osbaston, downstream of Kentchurch Weir - to improve fish passage upstream. However, the 2 metre high Kentchurch Weir posed as a significant and impassable barrier to fish passage further upstream. A £100,000, 18 month-long project was undertaken, beginning in 2008, to remove this structure and open up the upper reaches of the Monnow.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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(affects all case studies in this subcatchment)

Site

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Name	Monnow at Kentchurch Weir
WFD water body codes	GB109055029720
WFD (national) typology	Mid, Medium, Calcareous
WFD water body name	R Monnow - conf Afon Honddu to conf R Wye
Pre-project morphology	High width:depth. Significant backwater upstream of impoundment.
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

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Reach length directly affected (m)
Project started
Works started	2011/08/01
Works completed	2012/08/15
Project completed
Total cost category	100 - 500 k€
Total cost (k€)	120120 k€ <br />120,000 € <br />
Benefit to cost ratio
Funding sources	UK European Fisheries Fund Operational Programme

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

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Mitigation of a pressure
Hydromorphology
Biology	Good ecological status, but weir removal to improve fish passage to upper reaches. Also, to improve habitat for macrophytes and macroinvertebrates.
Physico-chemical
Other reasons for the project

Measures

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Structural measures
Bank/bed modifications
Floodplain / River corridor	Weir removed to allow free fish passage upstream.
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
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Monitoring

Hydromorphological quality elements

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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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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Physico-chemical quality elements

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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

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Bathymetric Survey	Yes	No	No	Yes	No
Sediment Contamination Assessment	Yes	No	No	Yes	No

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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Considered to be the largest ever weir removal undertaken in Wales. Removal has allowed 160km of the Monnow catchment to be restored to its natural condition of flow and connectivity.