Case study:River Rhee

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Location: 52° 6' 44.25" N, 0° 4' 17.70" W

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Hydromorphology
Country	England
Main contact forename	Martin
Main contact surname	Janes
Main contact user ID
Contact organisation	River Restoration Centre
Contact organisation web site	http://www.therrc.co.uk
Partner organisations
Parent multi-site project
This is a parent project encompassing the following projects	No

The restored Rhee, rich in plant life in the summer of 2006

Project summary

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Prior to the restoration works, the River Rhee was a typical example of a degraded lowland agricultural river. The river, a base fed brook, had become lost in its channel and was suffering severe siltation problems. Also, the populations of wild brown trout had been in a state of decline.

The restoration project aimed to increase velocities to allow scour and maintain a central, silt-free channel, diversifying the habitat whilst ensuring there was no increase in flood risk. This was achieved through re-grading of the bank to create a shelf as an aquatic plant habitat and a spawning area for a number of fish species. The shelf also narrowed the channel, increasing flow and clearing silt. Stretches of the river were also re-meandered to further diversify flow and, on existing bends, wetlands were created on the inside bend to provide a new habitat. Finally, a backwater was created to provide fish with a refuge during high flows, and habitat for fish fry and invertebrates.

Monitoring surveys and results

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Lessons learnt

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Image gallery

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The created backwater, April 2004

The entrance to the backwater

The created shelf, mid-construction. See the narrowing of the river. August 2008

Willow bundles and coir fibre rolls, June 2006

Willow bundles and coir fibre rolls, June 2006

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 Cam and Ely Ouse (including South Level) Subcatchment River name Mill River Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 167167 m <br />0.167 km <br />16,700 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Arable and Horticulture Waterbody ID GB105033038030 Site Edit site Name River Rhee at Wendy WFD water body codes GB105033038030 WFD (national) typology WFD water body name Mill River 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) 2000 m2 km <br />200,000 cm <br /> Project started 2001/09/01 Works started Works completed Project completed 2002/09/30 Total cost category 10 - 50 k€ Total cost (k€) 19 k€19,000 € <br /> 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 Continuity of sediment transport Biology Fish: Abundance, Fish: Species composition Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Bank reprofiling Floodplain / River corridor Creation of backwaters Planform / Channel pattern Channel narrowing, Adding sinuosity, Creation of meanders 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 http://www.therrc.co.uk/sites/default/files/projects/p1494.pdf River Restoration Case Study Supplementary Information Edit Supplementary Information