Case study:Cornmill Gardens (QUERCUS)

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Location: 51° 27' 47.52" N, 0° 0' 48.90" W

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Project overview

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Status	Complete
Project web site
Themes	Social benefits, Spatial planning
Country	England
Main contact forename	Paul
Main contact surname	Chapman
Main contact user ID
Contact organisation	London Borough of Lewisham
Contact organisation web site	http://www.lewisham.gov.uk/Pages/default.aspx
Partner organisations	Environment Agency, Building Design Partnership
Parent multi-site project
This is a parent project encompassing the following projects	No

Project picture

Project summary

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Site background

Before the regeneration of this site, this section of the Ravensbourne flowed through an area known as the Sundermead Estate. The river had been constrained within a narrow concrete channel as part of an historic flood defence scheme. This, together with high steel railings and overgrown vegetation had resulted in a neglected river possessing little ecological or local community interest. The river restoration scheme formed part of the 'Urban Renaissance in Lewisham' programme which aimed to create a new public open space within the Town Centre.

Objective

To remove the river from it’s concrete banks and create an attractive public open space.

Design

Following the preparation of design proposals and a full public consultation, a masterplan was developed for the whole site. The concrete walls of the river were removed and replaced with more natural re-graded banks interspersed with steps and wooden platforms to improve river bank access. A puddle –clay liner was constructed to help restore flows. Gravels were introduced into the bed of the river. These were sized to ensure that they could move in the channel with respect to the flow conditions, thus creating natural habitat features for wildlife. Marginal areas were planted with native species such as Rush (Juncus effusus) and Yellow flag Iris (Iris pseudacorus) whilst a wildflower mix was sown along the banks. An overflow storage area which retains water during high flows was designed into the scheme by lowering an open space alongside the river.

Subsequent Performance Flood management within the channel should have been improved through a combination of making space for water by reprofiling the bank and creating additional storage on the floodplain. The area demonstrates how river restoration can be an integral part of a regeneration programme the helps to create a more attractive, diverse and accessible public open space with a natural river able to support a range of wildlife; mallards and moorhens have already been cited.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Thames
River basin	Roding, Beam and Ingrebourne

Subcatchment

River name	Ravensbourne
Area category	10 - 100 km²
Area (km2)
Maximum altitude category	Less than 100 m
Maximum altitude (m)	8888 m <br />0.088 km <br />8,800 cm <br />
Dominant geology	Calcareous
Ecoregion	Great Britain
Dominant land cover	Suburban
Waterbody ID	GB106037028110

Other case studies in this subcatchment: ERCIP - European River Corridor Improvement Plans, The River Ravensbourne (submission for UK Rivers Prize 2016

Site

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Name	Cornmill Gardens
WFD water body codes
WFD (national) typology
WFD water body name	Ravensbourne (Catford to Deptford)
Pre-project morphology	Artificial channel
Reference morphology
Desired post project morphology
Heavily modified water body	Yes
National/international site designation
Local/regional site designations
Protected species present	No
Invasive species present	Yes
Species of interest	Japanese knotweed (Fallopia japonica), Himalayan balsam (Impatiens glandulifera ), European eel (Anguilla anguilla)
Dominant hydrology
Dominant substrate
River corridor land use	Urban
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)	100m0.1 km <br />10,000 cm <br />
Project started
Works started
Works completed
Project completed	2007/12/31
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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
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	Flood and coastal erosion protection
Hydromorphology
Biology
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Measures

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Structural measures
Bank/bed modifications	Removal of concrete banks and bed, Bank reprofiling
Floodplain / River corridor	creation of buffer strips
Planform / Channel pattern	Improvement of channel morphology
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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
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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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Monitoring documents

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Image gallery

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prior to works

facing upstream

downstream

Additional documents and videos

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Additional links and references

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Link	Description
http://www.therrc.co.uk/case studies/cornmill%20gardens.pdf	RRC summary
http://www.therrc.co.uk/lrap/lplan.pdf	London Rivers Action Plan
http://ww.ukcip.org.uk/.../wp.../EA-LA-case-studies-partnerships.pdf	EA and LA case study

Supplementary Information

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