Case study:Colfes School

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Location: 51° 26' 41", 0° 1' 49"
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Project overview

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Status Planned
Project web site
Themes Fisheries, Flood risk management, Habitat and biodiversity, Social benefits
Country England
Main contact forename Matthew
Main contact surname Blumler
Main contact user ID
Contact organisation
Contact organisation web site
Partner organisations This would be a collaborative project involving a partnership between local organisations and landowners, Green Chain, Walk, Environment Agency
Parent multi-site project
This is a parent project
encompassing the following
projects
No
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Project summary

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Break river out of concrete channel, re-profile creating natural banks. Replace straightened course of the river with natural meanders. Allow more natural fluvial geomorphological processes to occur and increase habitat. Improved flood alleviation to downstream areas. Integrate with school sports facilities and buildings to provide educational facility for school that could be shared with others. Provide riverside walk to link existing river restorations in Chinbrook Meadows and Sutcliffe Park. Potential for extending the current GREEN CHAIN WALK through Chinbrook Meadows northwards into Greenwich and award winning Sutcliffe Park, alongside a naturalised urban river. Provide natural amenity and green pedestrian walk within urban environment. The Quaggy at this point lies within a straight concrete channel, inside a 6 metre strip enclosed by high fences. The fenced off strip runs through school and private playing fields. As a result the river is extremely degraded with poor aesthetic appeal, is devoid of geomorphological features of interest and has low ecological value. From the upper (southern) end it is possible to walk through largely green space to Chinbrook Meadows and a section of the Green Chain walk where the river was restored in 2002. From the lower (northern) end it is a short distance to Sutcliffe Park where the river was recently restored as part of a flood alleviation scheme. Enhancement would connect these two restored sections for wildlife and people, as well as providing new habitat and a direct educational facility within adjacent school playing fields.
Landowner details:
1. South section: Greenwich council – meadow. Approached and receptive. (Councillor Brian Woodcraft. Ward: Middle Park and Sutcliffe.)
2. Middle section and Left bank: Colfes school – playing fields and fenced off rough ground adjacent to river. Approached in 2005 – not receptive at that time
3. Middle and north section and right bank: Old Brockleians rugby club – playing fields and rough ground adjacent to the river. Approached and receptive. (Ron Tennant, previous president)
4. North section left bank: Possibly or previously Civil Service. Playing fields.
Key themes (Other):
1.) BAP. It will contribute towards the ‘Creating a Better Place’ objective to make proportionate progress towards BAP targets for wetland-related species and habitats’
2.) The works would also fall within the Agency’s duties as set out in the Environment Act 1995 to promote the conservation and enhancement of the natural beauty and amenity of inland and coastal waters and of land associated with such waters.
3) Green Chain Walks – Would create the possibility of extending the green chain walks with a new riverside walk linking the boroughs of Bromley, Lewisham and Greenwich.
Requires the agreement and cooperation of four landowners, including Colfes school. Of these one, Colfes school, was not receptive three years ago when approached in 2005. Sensitivity regarding playing fields, although these do not go right to the edge of the current river course.

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Catchment and subcatchment

Catchment

River basin district Thames
River basin London

Subcatchment

River name Quaggy
Area category 10 - 100 km²
Area (km2)
Maximum altitude category 100 - 200 m
Maximum altitude (m) 135
135 m
0.135 km
13,500 cm
Dominant geology Calcareous
Ecoregion Great Britain
Dominant land cover Suburban
Waterbody ID GB106039023290



Other case studies in this subcatchment: Lidl, Manor House Gardens, Manor House Gardens Gauging Station, Manor Park, Mottingham Farm, Quaggy Flood Alleviation Scheme, Quaggy channel improvements, River Quaggy- Chinbrook meadows, Sutcliffe Park, Sydenham Cottages Nature Reserve


Site

Name
WFD water body codes GB106039023290
WFD (national) typology
WFD water body name Quaggy
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

Reach length directly affected (m) 750 m
0.75 km
75,000 cm
Project started 2008/01/01
Works started
Works completed
Project completed
Total cost category 500 - 1000 k€
Total cost (k€)
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

Mitigation of a pressure Flood risk management, Urbanisation
Hydromorphology Channel pattern/planform
Biology
Physico-chemical
Other reasons for the project Recreation


Measures

Structural measures
Bank/bed modifications Bank reprofiling, Removing of concrete structures
Floodplain / River corridor
Planform / Channel pattern Creation of meanders
Other
Non-structural measures
Management interventions
Social measures (incl. engagement) Aesthetics, Improved public access, Community Education
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

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Any other monitoring, e.g. social, economic

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Supplementary Information

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