Case study:River Ray Rural Flooding

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Location: 51° 50' 43.25" N, 1° 9' 17.40" W

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/34_riverray.pdf
Themes	Flood risk management, Habitat and biodiversity, Land use management - agriculture, Water quality
Country	England
Main contact forename	Tom
Main contact surname	Ormesher
Main contact user ID
Contact organisation	National Farmers Union
Contact organisation web site	http://www.nfuonline.com/home/
Partner organisations	JBA Consulting
Parent multi-site project
This is a parent project encompassing the following projects	No

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Project summary

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In light of the winter 2013 to 2014 flooding, farmers asked the National Farmers Union (NFU) for assistance in developing pragmatic options to help reduce flood damages to agricultural businesses and rural communities. In an attempt to build consensus on developing community driven approaches to flood and coastal risk management (FCRM), a 2-part investigation based on the River Ray catchment in Oxfordshire was made by NFU South East. • A survey of the attitudes of farmers in the catchment to conventional and novel approaches to flood risk management received responses from approximately 47% of all catchment landowners. • A hydrological modelling study considered the relative impacts of various land use and land management scenarios on the severity of flooding events. Scenarios included comparisons between watercourse maintenance, pond creation/enhanced flood storage, soil compaction, urbanisation effects and climate change predictions. The unconstrained modelling scenarios predicted: • damage reductions of 61% (agricultural) and 64% (property) from watercourse maintenance • 31–37% reduction in agricultural damages from additional pond storage • ±34% (agriculture) and ±166% (urban) damage sensitivity from unconstrained soil compaction • 15% damage increase from climate change These are not 'real world' predictions but indicate the relative gains possible from a combination of approaches where consensus can be reached.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Ray 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 2014 Works started Works completed Project completed Total cost category Total cost (k€) £33k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources National Farmers Union 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 Surface drainage systems improved 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