Case study:River Kennet Restoration at Durnsford

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Location: 51° 25' 4", -1° 30' 28"
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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 Judy
Main contact surname England
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.environment-agency.gov.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

Catchment

River basin district Thames
River basin Kennet and Pang

Subcatchment

River name Middle Kennet (Marlborough to Newbury)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 264
264 m
0.264 km
26,400 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB106039023172



Other case studies in this subcatchment: Eastridge Estate restoration project, Habitat Improvement: Stonebridge River Reserve, Og and Marlborough Fish Migration


Site

Name Denford Common
WFD water body codes GB106039023172
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 Yes
National/international site designation
Local/regional site designations Area of Special Conservation Interest
Protected species present No
Invasive species present No
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) 9.75
9.75 m³/s
9,750 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 2000 m
2 km
200,000 cm
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

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

Structural measures
Bank/bed modifications Regrading, Removal of invasive species, Cut back of trees, Depth variation, Introducing large woody debris, Introduction of gravel
Floodplain / River corridor Connection to wider floodplain, Creation of wetland
Planform / Channel pattern Channel narrowing, Adding sinuosity
Other
Non-structural measures
Management interventions Management of organic and inorganic sediments
Social measures (incl. engagement) Improved public access
Other


Monitoring

Hydromorphological 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

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

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



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Additional links and references

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Supplementary Information

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