Case study:Evenlode Catchment Project

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Location: 51° 51' 42.97" N, 1° 36' 17.84" W

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Project overview

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Status	In progress
Project web site	http://www.therrc.co.uk/sites/default/files/projects/43_evenlode.pdf
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Land use management - forestry, Monitoring, Water quality
Country	England
Main contact forename	Joanne
Main contact surname	Old
Main contact user ID
Contact organisation	Environment Agency
Contact organisation web site	http://www.gov.uk/government/organisations/environment-agency
Partner organisations	Wild Oxfordshire, West Oxfordshire District Council, Windrush AEC Ltd, Wychwood Project, Thames Water, Cotswolds Rivers Trust, Berks, Bucks and Oxon Wildlife Trust, Forestry Commission, Sylva Foundation, Centre for Ecology & Hydrology, Cotswolds Area of Outstanding Natural Beauty, Natural England, Upper Thames Fisheries Consultative, Combe Mill Education Centre, Blenheim Estate
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 River Evenlode, a headwater tributary in the Thames Basin (Map 1), is a flashy clay catchment with several small rural towns and villages prone to flooding. The Environment Agency is working with the Evenlode Catchment Partnership and local communities to develop and coordinate a 5-year project that integrates Water Framework Directive (WFD) objectives with a Natural Flood Management (NFM) demonstration scheme. The natural solutions to manage floodwaters often require land management changes to slow and store run-off, which can have multiple benefits for water quality and habitat creation, and drive improvements in agricultural land management. In Year 1 of the project, a tributary catchment (16.3km2) trial in Littlestock Brook was set up with key landowners and the Parish Council. Opportunity mapping, site walkovers and modelling are being used to plan and implement a suite of NFM/WFD measures such as creating temporary water retention ponds in field corners, constructing bunds and scrapes to store more floodwater on grassland areas, installing woody material in-channel to create leaky dams, and land management changes including planting woodland in flood source areas and along flood pathways. A project officer employed by the Evenlode Catchment Partnership in 2017 will work with partners to implement NFM and WFD opportunities across the 180km2 Upper Evenlode catchment. A key objective is to ensure full integration with Thames Water’s phosphate reduction project and Natural England’s Catchment Sensitive Farming initiative if opportunity mapping directs the project to work in the same tributaries of the Evenlode. The results from this first NFM trial in the Thames Basin will contribute to the call nationally for evidence on the effectiveness of natural measures for flood risk in lowland catchments. Through an academic partnership a river level and turbidity monitoring network has been installed in Littlestock Brook. The plan is to engage the community to actively support this monitoring network. A key objective of this project is to determine whether multiple small-scale NFM interventions in these catchments can provide a material benefit to flood frequency and extent. For these natural solutions to be successful, it is crucial to empower the community in decision-making and for them to take ownership of the local solutions employed. Employing an NFM project officer to work with the Evenlode Catchment Partnership is fulfilling Defra's ambition to develop community driven, catchment-based solutions to environmental issues through the forum of catchment partnerships.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Evenlode 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 2016 Works started Works completed Project completed Total cost category Total cost (k€) £480k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Thames RFCC local levy, Flood and Coastal Risk Management, Environment Agency Grant in Aid, Water Framework Directive, Parish Council, Cotswold River Trust, Landowner 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 Flood risk management Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern Other Runoff pathway management Non-structural measures Management interventions Social measures (incl. engagement) Other 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 Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information