Case study:Nar SSSI project

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Location: 52° 41' 59.18" N, 0° 36' 42.61" E

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Project overview

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Status	Complete
Project web site
Themes	Hydromorphology, Monitoring, Spatial planning
Country	England
Main contact forename	James
Main contact surname	Holloway
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

River Nar after the work was completed

Project summary

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The existing river was an artificially wide channel with virtually no gradient. The existing wooden flow deflectors installed between 2002 and 2003 were insufficient in their attempts to enhance flow diversity. The project successfully narrowed the river through the construction of artificial berms mimicking those found naturally and the excavation of pools.

Monitoring surveys and results

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Lessons learnt

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Image gallery

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Deflector transformed to shoulder, March 2011

Deflector transformed to shoulder, July 2011

Added sinuosity to the river, March 2011

Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) Catchment River basin district Anglian River basin North West Norfolk Subcatchment River name Nar to confl with Blackborough Drain Area category 100 - 1000 km² Area (km2) Maximum altitude category Less than 100 m Maximum altitude (m) 9595 m <br />0.095 km <br />9,500 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105033047791 Other case studies in this subcatchment: Castle Acre Rehabilitation Project, Narborough Rehabilitation Project, River Nar Castle Acre Common WEG project, River Nar Restoration Project, River Nar, Mileham River Restoration Project, West Lexham Rehabilitation Project Site Edit site Name Narbough Trout Fishery WFD water body codes GB105033047791 WFD (national) typology WFD water body name Nar to confl with Blackborough Drain Pre-project morphology Single channel, Straight, Embanked, High width:depth Reference morphology Sinuous, Pool-riffle Desired post project morphology Heavily modified water body Yes National/international site designation UK - Site of Special Scientific Interest Local/regional site designations Protected species present No Invasive species present No Species of interest Water Vole Dominant hydrology Groundwater Dominant substrate Silt, Sand River corridor land use Urban, Woodland, Grassland Average bankfull channel width category 10 - 50 m Average bankfull channel width (m) Average bankfull channel depth category 5 - 10 m 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) 1000 m1 km <br />100,000 cm <br /> Project started 2011/02/01 Works started Works completed 2011/03/01 Project completed Total cost category Total cost (k€) 3 k€3,000 € <br /> Benefit to cost ratio Funding sources 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 Supplementary funding information The entire project, covering 1 km of channel, was delivered by a team of 3 people in less than 3 days and for under 3 thousand pounds. Accordingly, although early days, it seems that the Nar SSSI project can be viewed as a successful low-cost ‘quick win’ project in a constrained site. Reasons for river restoration Edit reasons for restoration Mitigation of a pressure Flood defence Hydromorphology Quantity & dynamics of flow, Flow velocities, Channel pattern/planform Biology Physico-chemical Other reasons for the project Enhancement of flow diversity Measures Edit Measures Structural measures Bank/bed modifications Creation of shoulders, Embankment creation, Creation of pools Floodplain / River corridor Ensure floodplains left unmodified Planform / Channel pattern Channel narrowing Other Maintain water vole habitat 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 Flow velocities Yes Yes Yes Awaiting results Quantity & dynamics of flow Yes Yes Yes Awaiting results 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 http://www.therrc.co.uk/case studies/rrc%20case%20study%20-%20narborough%202011.pdf River Restoration Centre Case Study http://www.youtube.com/watch?v=aej4PTzf 0U&feature=plcp River Nar berm creation video Supplementary Information Edit Supplementary Information