Case study:Colliers Row

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Location: 51° 35' 37", 0° 9' 14"
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Project overview

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Status Planned
Project web site
Themes Habitat and biodiversity, Social benefits
Country England
Main contact forename Becca
Main contact surname O’Shea
Main contact user ID
Contact organisation Environment Agency
Contact organisation web site http://www.gov.uk/government/organisations/environment-agency
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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Small deflectors placed within the channel, which could help to encourage the creation of some pool riffle sequences within the channel. There is potential to re-profile some sections of the river bank along recreation ground, which would create shelves for aquatic planting. By re-profiling the banks it would be possible to reconnect the river to its floodplain. This stretch of the Rom possesses natural banks and bed, though in the past it seems to have been straightened, demonstrated by a uniform channel throughout. The river is overly straight where it runs between Carter Avenue and Turpin drive, but is beginning to restore itself in places. The natural gravel bed is evident. Where the river enters the recreation ground it is also straight lacking much geomorphological diversity, the banks are overly steep and uniform.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

Catchment

River basin district Thames
River basin Roding, Beam and Ingrebourne

Subcatchment

River name Rom / Beam (Including Bourne Brook, from Watton's Green to confluence with Ravensbourne)
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 107
107 m
0.107 km
10,700 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Improved grassland
Waterbody ID GB106037028120



Other case studies in this subcatchment: Chase Nature Reserve, King Georges Playing Field, Raphael Park, Roneo Corner


Site

Name
WFD water body codes GB106037028120
WFD (national) typology
WFD water body name Rom / Beam (Including Bourne Brook, from Watton's Green to confluence with Ravensbourne)
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)
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Average channel gradient
Average unit stream power (W/m2)


Project background

Reach length directly affected (m) 900 m
0.9 km
90,000 cm
Project started 2010/01/01
Works started
Works completed
Project completed
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Total cost (k€)
Benefit to cost ratio
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Cost for project phases

Phase cost category cost exact (k€) Lead organisation Contact forename Contact surname
Investigation and design
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Works and works supervision
Post-project management and maintenance
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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 Bank reprofiling, Deflectors
Floodplain / River corridor
Planform / Channel pattern
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

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Physico-chemical quality elements

Element When monitored Type of monitoring Control site used Result
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Any other monitoring, e.g. social, economic

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Monitoring documents



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Supplementary Information

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