Case study:River Wensum Rehabilitation Project - Bintree

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Location: 52° 46' 53", 0° 57' 38"
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Project overview

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Status Complete
Project web site
Themes Flood risk management, Habitat and biodiversity, Hydromorphology, Social benefits, Water quality
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

Case_study:Wensum River Restoration Strategy

This is a parent project
encompassing the following
projects
No
The River Wensum

Project summary

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In the past this section of the Wensum at Bintree Mill has been dredged creating a deepened and overwidened channel with uniform flow, and has suffered from over-grazing and trampling by Limosin cattle. The Bintree Angling Club had ownership of the fishing rights of this stretch of the river and implemented habitat improvements that to promote wild brown trout fishery with less reliance on stocking. This was achieved through channel narrowing, riffle installation, fencing, flow deflectors, tree planting and the creation of fenced cattle crossing points.

Monitoring surveys and results

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Lessons learnt

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Image gallery


Wensum in February 2001
Wensum in February 2007
Cattle access point in 2001
Cattle access point in 2007
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Catchment and subcatchment

Catchment

River basin district Anglian
River basin Broadland Rivers

Subcatchment

River name Wensum
Area category 10 - 100 km²
Area (km2)
Maximum altitude category Less than 100 m
Maximum altitude (m) 98
98 m
0.098 km
9,800 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB105034051110



Other case studies in this subcatchment: Wensum River Restoration Strategy


Site

Name Bintree
WFD water body codes GB105034051100
WFD (national) typology R19
WFD water body name Wensum
Pre-project morphology Single channel
Reference morphology Single channel
Desired post project morphology
Heavily modified water body Yes
National/international site designation EU - Special Area of Conservation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology Groundwater
Dominant substrate Gravel
River corridor land use Intensive agriculture
Average bankfull channel width category 2 - 5 m
Average bankfull channel width (m)
Average bankfull channel depth category 0.5 - 2 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

Reach length directly affected (m) 1500 m
1.5 km
150,000 cm
Project started 2000/08/01
Works started
Works completed
Project completed 2010/10/01
Total cost category 50 - 100 k€
Total cost (k€) 73 k€
73,000 €
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 Environment Ahgency Simon Johnson
Stakeholder engagement and communication
Works and works supervision Environment Agency Rob Dryden
Post-project management and maintenance
Monitoring



Reasons for river restoration

Mitigation of a pressure Agriculture
Hydromorphology Channel pattern/planform, Quantity & dynamics of flow, Connection to groundwaters
Biology Invertebrates
Physico-chemical
Other reasons for the project Flood risk management, Community demand


Measures

Structural measures
Bank/bed modifications Bed raising
Floodplain / River corridor
Planform / Channel pattern Channel narrowing
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other Participation in maintenance


Monitoring

Hydromorphological quality elements

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

Biological quality elements

Element When monitored Type of monitoring Control site used Result
Before measures After measures Qualitative Quantitative
Invertebrates: Taxonomic composition Yes Yes

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

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


Monitoring documents




Additional documents and videos


Additional links and references

Link Description
http://therrc.co.uk/case studies/wensum-%20bintree.pdf River Restoration Centre Case Study 2009
http://therrc.co.uk/case studies/wensum%20at%20bintree%20final.pdf River Restoration Centre Case Study 2010
http://http://www.environment-agency.gov.uk/homeandleisure/wildlife/114676.aspx River Wensum restoration project - EA pages

Supplementary Information

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