Case study:Habitat improvements in the upper Kennet

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Location: 51° 26' 25", -1° 41' 41"
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Project overview

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Status In progress
Project web site
Themes Habitat and biodiversity, Social benefits, Water quality
Country England
Main contact forename Charlotte
Main contact surname Hitchmough
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations Action for the River Kennet (ARK), Marlborough Town Council, Marlborough Area Development Trust, local volunteers
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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The project to enable fish to swim through Marlborough will build a new channel linking the existing main river with a backstream, which currently flows intermittently down a cascade that is impassable to fish. The new channel will have a gentle gradient which will allow fish, including brown trout and grayling to swim up and down it. This is phase two of a project to link the river above and below Marlborough. The river above Marlborough is a valuable spawning habitat, but all the fish here died during the 2011/12 drought. Joining the two sections of river should improve the fish populations up and downstream. The habitat restoration projects use relatively simple techniques and materials and a considerable portion of the work will be done by volunteers. The work will repair eroded parts of the bank and create meanders and changes in flow which will create a more diverse environment to suit a variety of fish species and life stages. By fencing livestock away from the river the project will reduce bank erosion and keep sediment out of the river as a result. This keeps the natural gravel bed clean, leaving it clear for fish spawning and healthy weed growth. We will improve water quality, by diverting urban runoff from the road into a reedbed, which will filter out pollutants before the water reaches the river.

Community Involvement:
- Local schools will use the Stonebridge and Og sites as an educational resource
- Local people will be connected to their river, either because they have volunteered to work on the project or because they can now walk along a section of river which was previously inaccessible

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During works
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Catchment and subcatchment

Catchment

River basin district Thames
River basin Kennet and Pang

Subcatchment

River name Upper Kennet to Marlborough
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 200 - 500 m
Maximum altitude (m) 293
293 m
0.293 km
29,300 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB106039023171



Site

Name Kennet
WFD water body codes GB106039023171
WFD (national) typology
WFD water body name Upper Kennet to Marlborough
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 2012/07/01
Works started
Works completed
Project completed 2015/03/01
Total cost category 100 - 500 k€
Total cost (k€) 104
104 k€
104,000 €
Benefit to cost ratio
Funding sources Catchment Restoration Funds

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 Erosion
Hydromorphology
Biology Fish
Physico-chemical
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern Creation of meanders
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Engagement with schools, Community Education, Community involvement, Improved public access
Other Local support, Community engagement


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



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Additional links and references

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Supplementary Information

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