Case study:Nar SSSI project: Difference between revisions

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|Average bankfull channel depth category=5 - 10 m
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{{Project_background
{{Project background
|Reach length directly affected=
|Reach length directly affected=1000 m
   
|Project started=2011/02/01
   
|Works completed=2011/03/01
      1000 m
|Total1 cost=3 k€
|Project started=
|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.
      2011/02/01
|Works started=
     
|Works completed=
      2011/03/01
|Project completed=
     
|Total cost category=
      Less than 10 k€
|Total1 cost=
      3 k€
|Funding sources=
     
|Investigation and design cost category=
     
|Invst and design cost=
     
|Investigation and design Lead organisation=
     
|Investigation and design Other contact forename=
     
|Investigation and design Other contact surname=
     
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|Post-project1 management and maintenance cost category=
     
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{{Motivations

Revision as of 08:32, 9 August 2012

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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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(affects all case studies in this subcatchment)

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
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

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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


Shoulder Mar 11.JPG
Shoulder Jul 11.JPG
Sinous Mar 11.JPG



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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Retrieved from "https://restorerivers.eu/wiki/index.php?title=Case_study:Nar_SSSI_project&oldid=1140"