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	Nick
Main contact surname	Elbourne
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

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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.

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Anglian
River basin	Cam and Ely Ouse (including South Level)

Subcatchment

River name	Cam
Area category	100 - 1000 km²
Area (km2)
Maximum altitude category	Less than 100 m
Maximum altitude (m)	2525 m <br />0.025 km <br />2,500 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Arable and Horticulture
Waterbody ID	GB105033042750

Site

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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

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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

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Mitigation of a pressure
Hydromorphology	Continuity of sediment transport
Biology	Fish: Abundance, Fish: Species composition
Physico-chemical
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Measures

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

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Biological quality elements

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quality elements

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Physico-chemical quality elements

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quality elements

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Any other monitoring, e.g. social, economic

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Monitoring documents

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Image gallery

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Additional links and references

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Supplementary Information

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