Case study:River Kennet Restoration at Durnsford

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Location: 51° 25' 4.44" N, 1° 30' 27.86" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology, Monitoring
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	http://www.therrc.co.uk
Partner organisations	Natural England
Parent multi-site project
This is a parent project encompassing the following projects	No

Overwide section immediately upstream of where works were completed. Courtesy of Google Earth (2013)

Project summary

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Restoration measures implemented along a 2000m section included profile regrading, introduction of large woody debris, removal of invasive species, placement of gravels, cutting trees back, re-connection to adjacent floodplain, creation of wetlands and narrowing of the channel to reintroduce sinuousity.

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	Denford Common
WFD water body codes
WFD (national) typology
WFD water body name
Pre-project morphology	Straight, Embanked, High width:depth
Reference morphology	Pool-riffle, Sinuous
Desired post project morphology
Heavily modified water body	true
National/international site designation
Local/regional site designations	Area of Special Conservation Interest
Protected species present
Invasive species present
Species of interest
Dominant hydrology	Quick run-off
Dominant substrate	Cobble, Estuarine mud, Silt
River corridor land use	Extensive agriculture
Average bankfull channel width category	10 - 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	5 - 10 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s)	9.759.75 m³/s <br />9,750 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	2000 m2 km <br />200,000 cm <br />
Project started	2009/10/01
Works started
Works completed	2010/03/01
Project completed
Total cost category
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

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Mitigation of a pressure	Invasive species
Hydromorphology	Flow velocities, Substrate conditions, Channel pattern/planform, Continuity for organisms
Biology	Fish: Species composition, Fish: Abundance, Invertebrates
Physico-chemical
Other reasons for the project	Recreation, Habitat enhancement

Measures

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Structural measures
Bank/bed modifications	Regrading, Introduction of LWD and CWD, Removal of invasive species, Placement of gravels, Cut back of trees, Depth variation
Floodplain / River corridor	Re-connection to adjacent floodplain, Creation of wetlands
Planform / Channel pattern	Narrowing, Introduction of sinuousity
Other
Non-structural measures
Management interventions	Management of organic and inorganic sediments
Social measures (incl. engagement)	Improved public access
Other

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
Flow velocities		Yes	Yes			Awaiting results
Substrate conditions		Yes	Yes			Awaiting results

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
Fish: Abundance		Yes		Yes		Improvement
Fish: Species composition		Yes		Yes		Improvement
Invertebrates		Yes		Yes		Improvement

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

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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