Case study:River Nar, Mileham River Restoration Project

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Location: 52° 43' 40", 0° 48' 59"
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Project overview

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Status Complete
Project web site http://www.norfolkriverstrust.org/wp-content/uploads/2014/06/Monitoring-at-Mileham-restoration-site_summary.pdf
Themes Habitat and biodiversity
Country England
Main contact forename the
Main contact surname RRC
Main contact user ID User:JoshRRC
Contact organisation Norfolk Rivers Trust
Contact organisation web site
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
Project picture

Project summary

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Over the last 2 years we have been working in partnership with Coca-Cola to improve the health of the River Nar, in the Norfolk countryside, which is a site of special scientific interest, and in the healthiest stretches, is home to otters, water voles, trout and kingfishers. Please watch the video by clicking on the photo on the left.

The first river restoration project working with this partnership was at Mileham, which was completed in October 2012. The new sinuous channel travels through Mileham Common and into a meadow on a neighbouring farm. The highs and lows of the land change the depth and width of the river channel, this gives the new floodplain new habitat niches with varying wetness. These areas will give different species of flora and fauna unique habitats to thrive.

Monitoring surveys and results

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To find out what species were present on the site before works took place pre-river restoration monitoring was done. We monitored water quality (dissolved oxygen, water flow, conductivity, turbidity, water temperature and pH), invertebrates, water voles, other small mammals, macrophytes, terrestrial vegetation and fish.

Please see the attached document to the right of this page for more information and the results of the monitoring. We have also had post-river restoration monitoring for this project to find out what has changed and how the habitat has established. This document will be ready very soon.

Lessons learnt

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Catchment and 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) 95
95 m
0.095 km
9,500 cm
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, Nar SSSI project, Narborough Rehabilitation Project, River Nar Restoration Project, West Lexham Rehabilitation Project


Site

Name
WFD water body codes GB105033047791
WFD (national) typology
WFD water body name Nar to confluence with Blackborough Drain
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

Reach length directly affected (m)
Project started
Works started
Works completed 2012/10/01
Project completed
Total cost category
Total cost (k€)
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

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical Restored river towards favourable condition
Other reasons for the project


Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor Remeandering, Floodplain reconnection
Planform / Channel pattern
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other


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

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

Supplementary Information

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