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	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
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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Catchment and subcatchment

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Catchment

River basin district	Anglian
River basin	North West Norfolk

Subcatchment

River name	Nar
Area category
Area (km2)
Maximum altitude category
Maximum altitude (m)
Dominant geology
Ecoregion
Dominant land cover
Waterbody ID

Site

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Name	Narbough Trout Fishery
WFD water body codes
WFD (national) typology
WFD water body name
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

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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	Less than 10 k€"Less than 10 k€" is not in the list (Less than 1 k€, 1 - 10 k€, 10 - 50 k€, 50 - 100 k€, 100 - 500 k€, 500 - 1000 k€, 1000 - 5000 k€, 5000 - 10000 k€, more than 10000 k€) of allowed values for the "Total cost category" property.
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

Reasons for river restoration

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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

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Structural measures
Bank/bed modifications	Creation of shoulders, Material was removed from bed to build out banks, Creation of pools downstream
Floodplain / River corridor	Ensure floodplains left unmodified
Planform / Channel pattern	Narrowing of channel
Other	Maintain water vole habitat
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other

Monitoring

Hydromorphological quality elements

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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

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Physico-chemical quality elements

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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

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Monitoring documents

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Image gallery

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File:River Nar

Constructed double shoulders four months after works in July 2011

File:River Nar

Double shoulders under construction, with far bank berm yet to be capped, March 2011

File:River Nar

Introduced sinuosity, March 2011

File:River Nar

The same introduced sinuosity nine months later, December 2011

Additional documents and videos

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Additional links and references

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Link	Description
http://www.therrc.co.uk/case studies/rrc%20case%20study%20-%20narborough%202011.pdf	River Restoration Centre Case Study

Supplementary Information

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