Case study:River Eye

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Location: 52° 45' 24.77" N, 0° 49' 9.75" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity
Country	England
Main contact forename	Ruth
Main contact surname	Needham
Main contact user ID
Contact organisation	Trent Rivers Trust
Contact organisation web site	http://www.trentriverstrust.org
Partner organisations	Natural England
Parent multi-site project
This is a parent project encompassing the following projects	No

Project picture

Project summary

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The aim of the project was to restore reaches of river within the SSSI. In particular to increase channel sinuosity, retain large woody material, carry out bank enhancement and raise bed levels. Carry out tree management where agreed in the Strategic Restoration Plan (Royal Hakoning, 2014). The works consisted of constructing in channel and bank features to conserve, enhance, restore, and rehabilitate features along the river. A total of 30 features were installed to stimulate the level of natural processes to return the SSSI back to favourable condition in the medium to longer term.

• Bank re-profiling – 10 stretches of bank mainly the inside of meanders were re-profiled to vary the gradients, creating shallows and increase habitats. • Channel narrowing – In 4 suitable location banks were pushed into the channel to create backwaters • Brushwood mattresses – 9 BWM were installed to narrow over wide and straight sections of channel. • Large Wood Material – Locally sourced timber was installed in 7 location to add flow variation to the channel. • Gravel – Gravel was added to 3 locations to raise the bed level. It was introduced at 4 m intervals. • Tree planting – The river has little riparian tree cover so 475 trees were planted in 6 blocks.

Monitoring surveys and results

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As part of the restoration project TRT is undertaking a fixed point monitoring programme of the measures delivered. It includes photographs of each site before, during and post construction. The site was visited in December 2016 and all features were in situ and performing as planned.

Lessons learnt

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The long term overall benefits in terms of biodiversity of the restoration will been significant. However during the planning and the delivery stages several issues came to light that made the work more complicated and increased costs.

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Catchment and subcatchment Select a catchment/subcatchment Site Edit site Name River Eye WFD water body codes GB104028047550 WFD (national) typology WFD water body name River Eye Pre-project morphology Reference morphology Desired post project morphology Heavily modified water body No 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 white clawed crayfish (Austropotamobius pallipes), water boatman (Corixa panzeri) and white-legged damselfly (Platycnemis pennipes) Dominant hydrology Dominant substrate Clay River corridor land use Arable/pasture 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) 808808 m <br />0.808 km <br />80,800 cm <br /> Project started 2013 Works started 2016/10/04 Works completed 2017/03/20 Project completed 2017/03/20 Total cost category 10 - 50 k€ Total cost (k€) Benefit to cost ratio Funding sources Natural England 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 Channel pattern/planform Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Introducing large woody debris, Bed raising, Bank reprofiling, Introduction of gravel Floodplain / River corridor Tree management, Tree planting Planform / Channel pattern Channel narrowing, Creation of backwater 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