Case study:River Glaven, North Norfolk

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Location: 52° 52' 53.04" N, 1° 3' 57.45" E

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Project overview

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Status	Complete
Project web site	http://www.therrc.co.uk/sites/default/files/projects/5_glaven.pdf
Themes	Flood risk management, Habitat and biodiversity, Hydromorphology, Land use management - agriculture, Monitoring
Country	England
Main contact forename	Mark
Main contact surname	Wilkinson
Main contact user ID
Contact organisation	James Hutton Institute
Contact organisation web site	http://www.hutton.ac.uk/
Partner organisations	River Glaven Conservation Group, Wild Trout Trust, University College London, Queen Mary University of London, Environment Agency, Richard Hey, local farmers and landowners, Natural England, Norfolk Wildlife Trust
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 Glaven in north Norfolk has been historically modified, for example, through the creation of water mills. Coupled with this, widespread dredging has occurred and flood embankments have been created to protect agricultural land. The project's objectives were to improve the river corridor habitat by restoring river processes and reconnect the river and its floodplain and to develop an experience base that would serve the River Glaven Conservation Group (RGCG) well on other projects. The project provides a unique opportunity to monitor and model river and floodplain interactions. A MIKE SHE/MIKE 11 coupled hydrological/hydraulic model was employed to assess the impact of floodplain reconnection. Using data from 2007 to 2010, the study found that the removal of the embankment permitted widespread inundation of the floodplain at high flows (>1.7m3s-1) as well as enhancing flooding of the immediate riparian area during lower magnitude events. Removal of embankments has found to have reduced the channel capacity by approximately 60%, suggesting that overbank flooding was the most dramatic hydrological effect following the restoration project (Clilverd et al. 2013).

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name Glaven 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 2009 Works started Works completed Project completed Total cost category Total cost (k€) £50k"£" is not declared as a valid unit of measurement for this property. Benefit to cost ratio Funding sources Environment Agency, RGCG 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 Floodplain reconnection Planform / Channel pattern Habitat restoration Other 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