Case study:Quaggy channel improvements

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Location: 51° 27' 36", -0° 0' 19"
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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

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: 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

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
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Project background

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Reasons for river restoration

Mitigation of a pressure
Hydromorphology
Biology
Physico-chemical
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Measures

Structural measures
Bank/bed modifications
Floodplain / River corridor
Planform / Channel pattern
Other
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Management interventions
Social measures (incl. engagement)
Other


Monitoring

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Supplementary Information

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