Case study:Quaggy channel improvements

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Location: 51° 27' 35.67" N, 0° 0' 19.42" W

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Project overview

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Status	Complete
Project web site
Themes	Flood risk management
Country	England
Main contact forename	Toni
Main contact surname	Scarr
Main contact user ID	User:Ascarr
Contact organisation	Environment Agency
Contact organisation web site	http://www.environment-agency.gov.uk
Partner organisations	Quaggy Waterways Action Group
Parent multi-site project	Case_study:Quaggy Flood Alleviation Scheme
This is a parent project encompassing the following projects	No

gravel introduced into the channel and new wall

Project summary

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Along the stretch of river between Weigall Road and the centre of Lewisham, the Quaggy runs through rear gardens, beneath roads and along open urban spaces.

Some of the houses close to the river, mostly terraced homes, were at high risk of flooding. Our innovative approach allowed us to integrate flood defences sensitively within people’s gardens. These are now set back from the river, recovering land that can be used as part of the flood plain.

The riverbed has also been altered to create a more natural river with meanders and areas of deep and shallow water. Faster and slower flowing areas improve habitat for wildlife. Specialist bird boxes have been built into brick walls to provide nesting sites for grey wagtail and wrens.

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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 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, River Quaggy- Chinbrook meadows, Sutcliffe Park, Sydenham Cottages Nature Reserve Site Edit site Name Weigall Road to Lewisham WFD water body codes GB106039023290 WFD (national) typology Calcareous WFD water body name Quaggy Pre-project morphology 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 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) Project started Works started Works completed Project completed 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 Hydromorphology Biology Physico-chemical Other reasons for the project Measures Edit Measures Structural measures Bank/bed modifications Floodplain / River corridor Planform / Channel pattern 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 leaflet general information Additional links and references Edit links and references Link Description Supplementary Information Edit Supplementary Information