Case study:River Quaggy- Chinbrook meadows

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Location: 51° 25' 44.43" N, 0° 1' 38.18" E

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Project overview

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Status	Complete
Project web site
Themes	Habitat and biodiversity, Social benefits, Water quality, Urban
Country	England
Main contact forename	Dave
Main contact surname	Webb
Main contact user ID	User:Ascarr
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	QWAG, Lewisham Council
Parent multi-site project
This is a parent project encompassing the following projects	No

Chinbrook Meadows soon after the works had been completed

Project summary

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This project is an excellent example of a partnership initiative that has not only restored the river and floodplain, but has also paid careful attention to improving the park amenities. The channel work was completed in spring 2002 and by September that year there had already been considerable movement of gravels. Natural geomorphological features including a pool/riffle sequence, gravel bars and steeper banks had formed. The pond has been colonised by invertebrates and the vegetation planted along the banks is now providing good cover in both the planted and unplanted sections.

Site background This section of the River Quaggy, with a flashy flow regime, was channelised and straightened between 1960-1970 as part of a flood alleviation scheme. Prior to restoration it was encased in concrete with fences and high privet hedges near to each bank. It could neither be accessed nor viewed by the public and was devoid of natural fauna and flora.

Objectives To reintroduce the floodplain as a natural flood storage area as part of a larger catchment flood alleviation plan; to enable the River Quaggy to become accessible to the public and hence create a local amenity; to create an environment where native fauna and flora could colonise and allow for natural channel processes.

Design

• The concrete channel in the park was replaced by a sinuous channel, allowing easy

access. It was (except where the cost of moving existing sewage drains prevented this) cut to follow its path prior to channelisation.

• Whilst cutting the channel old gravels were evacuated and sufficient ‘room’ was left

along the river corridor to allow for natural adjustment.

• The margins of the channel were planted using a reputable source of native wetland

plants (including iris, water mint and reeds), a wetland grass and wild flower mix was also sown. One section downstream has not been planted since there was a request from the local group to allow natural colonisation.

• Flood storage ponds were included in the scheme and at the upstream section a

boardwalk, pond dipping and educational area, were incorporated to attract local school children.

Monitoring surveys and results

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Lessons learnt

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Image gallery

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The river Quaggy in Chinbrook meadows before restoration

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 London Subcatchment River name Quaggy Area category 10 - 100 km² Area (km2) Maximum altitude category 100 - 200 m Maximum altitude (m) 135135 m <br />0.135 km <br />13,500 cm <br /> Dominant geology Calcareous Ecoregion Great Britain Dominant land cover Suburban Waterbody ID GB106039023290 Other case studies in this subcatchment: Colfes School, Lidl, Manor House Gardens, Manor House Gardens Gauging Station, Manor Park, Mottingham Farm, Quaggy Flood Alleviation Scheme, Quaggy channel improvements, Sutcliffe Park, Sydenham Cottages Nature Reserve Site Edit site Name River Quaggy WFD water body codes GB106039023290 WFD (national) typology Calcareous WFD water body name Quaggy Pre-project morphology Straight, Revetments Reference morphology Sinuous 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 Artificially regulated, Quick run-off Dominant substrate Bedrock River corridor land use Urban Average bankfull channel width category 2 - 5 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) Average channel gradient category Average channel gradient 0.3 Average unit stream power (W/m2) Project background Edit project background Reach length directly affected (m) 300 m0.3 km <br />30,000 cm <br /> Project started 2002/03/01 Works started Works completed 2002/10/01 Project completed 2002/04/02 Total cost category 50 - 100 k€ Total cost (k€) 100 k€100,000 € <br /> Benefit to cost ratio Funding sources Environment Agency 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 Riparian development Hydromorphology Quantity & dynamics of flow, Channel pattern/planform Biology Invertebrates, Macrophytes Physico-chemical Oxygen balance Other reasons for the project Landscape enhancement, Flood risk management Measures Edit Measures Structural measures Bank/bed modifications Removal of revetments, Introduction of gravel, Planting of native species Floodplain / River corridor Removal of embankments, Creation of wetland, Creation of pond Planform / Channel pattern Adding sinuosity Other Non-structural measures Management interventions Social measures (incl. engagement) Other Information provision, Consultation 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 Invertebrates Yes Yes Yes Improvement Macrophytes Yes Yes Yes Improvement 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 Overview leaflet leaflet on social benefits Better Place to Play case study Additional links and references Edit links and references Link Description http://www.therrc.co.uk/sites/default/files/projects/p1499.pdf RRC site description http://www.restorerivers.eu/Publications/tabid/2624/mod/11083/articleType/ArticleView/articleId/3123/Chinbrook-Meadows----A-better-place-to-play.aspx Video on Chinbrook meadows http://www.qwag.org.uk/quaggy/restoration.php Quaggy Waterways Action Plan link http://www.lewisham.gov.uk/inmyarea/openspaces/parks/Pages/chinbrook-meadows.aspx Lewisham Council's link http://en.wikipedia.org/wiki/Chinbrook Meadows Wikipedia link http://www.greenchain.com/learning/sites/chinbrook-meadows.php Green chain link Supplementary Information Edit Supplementary Information