Case study:River Nar, Mileham River Restoration Project

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Location: 52° 43' 39.68" N, 0° 48' 58.98" E

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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.

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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, Nar SSSI project, Narborough Rehabilitation Project, River Nar Castle Acre Common WEG project, River Nar Restoration Project, West Lexham Rehabilitation Project Site Edit 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 Edit 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 Edit reasons for restoration Mitigation of a pressure Hydromorphology Biology Physico-chemical Restored river towards favourable condition Other reasons for the project Measures Edit 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 Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative 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 Supplementary Information Edit Supplementary Information