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

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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.

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prior to works

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Catchment and subcatchment Select a catchment/subcatchment Edit the catchment and subcatchment details (affects all case studies in this subcatchment) 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 Edit site 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 Edit project background Reach length directly affected (m) 100m0.1 km <br />10,000 cm <br /> Project started Works started Works completed Project completed 2007/12/31 Total cost category 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 Edit reasons for restoration Mitigation of a pressure Flood and coastal erosion protection Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures 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 Other Non-structural measures Management interventions Social measures (incl. engagement) Other Monitoring Hydromorphological quality elements Edit Hydromorphological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Biological quality elements Edit biological quality elements Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Physico-chemical quality elements Edit 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 Edit Other responses Element When monitored Type of monitoring Control site used Result Before measures After measures Qualitative Quantitative Monitoring documents Upload monitoring documents Additional documents and videos Upload additional documents Additional links and references Edit links and references 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 Edit Supplementary Information