Case study:River Eye

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Location: 52° 45' 25", -0° 49' 10"
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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.


Image gallery


Re profiled bank.JPG
Re profiled bank 2.JPG
BWM.JPG
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Catchment and subcatchment



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

Reach length directly affected (m) 808
808 m
0.808 km
80,800 cm
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

Mitigation of a pressure
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project


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

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

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Supplementary Information

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