Case study:River Roding at Ray Lodge Park

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Location: 51° 36' 59", 0° 3' 12"
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Project overview

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Status Complete
Project web site
Themes Habitat and biodiversity, Hydromorphology, Social benefits
Country England
Main contact forename John
Main contact surname Bryden
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.environment-agency.gov.uk
Partner organisations
Parent multi-site project
This is a parent project
encompassing the following
projects
No
River Roding after the restoration project

Project summary

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After works on a nearby motorway (the M11) in the 1970's ans 1980's, the River Roding was artificially diverted and straightened, resulting in poor quality wildlife habitat. The restoration project looked to address this by creating new habitats for a range of species including water voles, dragonflies and numerous fish species, without a reduction in flood protection. This was achieved through bank re-profiling, backwater creation and planting of the rivers banks.

Monitoring surveys and results

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Lessons learnt

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Image gallery


River Roding prior to the project
The created backwater
The backwater after the establishment of vegetation, September 2009
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Catchment and subcatchment

Catchment

River basin district Thames
River basin Roding, Beam and Ingrebourne

Subcatchment

River name Roding (Cripsey Brook to Loxford Water)
Area category 100 - 1000 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 124
124 m
0.124 km
12,400 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Arable and Horticulture
Waterbody ID GB106037028180



Other case studies in this subcatchment: Chigwell Brook, Fresh Wharf, Land opposite Wanstead Park, Valentines Park, Weir upstream of Redbridge roundabout


Site

Name Ray Lodge Park
WFD water body codes GB106037028180
WFD (national) typology
WFD water body name Roding (Cripsey Brook to Loxford Water)
Pre-project morphology Single channel, Impounded, High width:depth
Reference morphology Single channel, Sinuous, Pool-riffle
Desired post project morphology
Heavily modified water body Yes
National/international site designation
Local/regional site designations
Protected species present No
Invasive species present No
Species of interest
Dominant hydrology Quick run-off
Dominant substrate Bedrock
River corridor land use Urban
Average bankfull channel width category 5 - 10 m
Average bankfull channel width (m)
Average bankfull channel depth category 0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category
Mean annual discharge (m3/s) 1.85
1.85 m³/s
1,850 l/s
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 150 m
0.15 km
15,000 cm
Project started 2007/08/01
Works started 2007/10/01
Works completed 2008/01/01
Project completed
Total cost category 100 - 500 k€
Total cost (k€) 175 k€
175,000 €
Benefit to cost ratio
Funding sources London Borough of Redbridge, Environment Agency

Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design Environment Agency
Stakeholder engagement and communication Environment Agency
Works and works supervision Environment Agency
Post-project management and maintenance Environment Agency
Monitoring Environment Agency



Reasons for river restoration

Mitigation of a pressure
Hydromorphology Channel pattern/planform, Quantity & dynamics of flow
Biology
Physico-chemical
Other reasons for the project Landscape enhancement, Inter-tidal enhancement, Community demand


Measures

Structural measures
Bank/bed modifications Removal of revetments, Depth variation, Planting, Re-profiling
Floodplain / River corridor Removal of embankments
Planform / Channel pattern Creation of backwater, Creation of pond, Adding sinuosity
Other
Non-structural measures
Management interventions
Social measures (incl. engagement)
Other Participation in maintenance, Consultation, Participation in design


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
Public Accessibility Yes Yes Improvement


Monitoring documents



Additional documents and videos


Additional links and references

Link Description
http://www.therrc.co.uk/case studies/roding%20at%20redbridge.pdf River Restoration Centre Case Study

Supplementary Information

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