Case study:Habitat improvements in the upper Kennet

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Location: 51° 26' 25.13" N, 1° 41' 40.71" W

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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 volunteer and community groups
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.

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During works

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this 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) 293293 m <br />0.293 km <br />29,300 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB106039023171 Site Edit site Name Kennet 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 Edit 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€) 104104 k€ <br />104,000 € <br /> 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 Edit reasons for restoration Mitigation of a pressure Erosion Hydromorphology Biology Fish Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Creation of new meander Planform / Channel pattern Other Non-structural measures Management interventions Social measures (incl. engagement) Local schools will use the Stonebridge and Og sites as an educational resource. Other 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. Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Stand up for the Kennet web version.pdf Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information