SuDS in London - a guide

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2.2 The Thames River Basin London sits in the Thames River Basin District catchment which covers an area of over 16,200km² and where over 15 million people live. The Thames basin includes all water sources including rivers, lakes, groundwater and coastal waters. Within London there are 32 London boroughs, plus the City of London, eight areas in which catchment-based partnerships operate and 897 subcatchments. Reference should be made to the ‘Thames River Basin Management Plan’ to: • Understand local context • Target and coordinate interventions • Identify or access funding for improvements within the catchment • Ensure objectives of the Thames River Basin Management Plan and local plans are being achieved. The Thames River Basin Management Plan also provides further information on the catchment-based approach and London’s local catchment partnerships. Further information: Thames River Basin Management Plan British Geological Survey Thames River Basin 18 2 The London context
Hampstead Ridge Valley Lea Valley Lea Valley Lea Valley Lea Valley North Thames Terraces 2.3 London’s North Thames Terraces North Thames Terraces North Thames Terraces geological conditions Lower Thames Floodplain Greater London is situated in the London Lower Thames Floodplain Lower Thames Floodplain Basin. This is made up of layers of deposits Lower Thames Floodplain of chalk, clays, sand, and gravel. North Thames Terraces North Thames Terraces North Thames Terraces North Thames Terraces North Thames Terraces North Thames Terraces North Thames Terraces North Thames Terraces Further information: CIRIA C753 The SuDS Manual, Chapter 29 British Geological Survey Lower Thames Floodplain Geology Lower of Thames London Floodplain(2012), Royse et al Lower Thames Floodplain Management of the London Basin Chalk Lower Thames Floodplain Essex Plateau Essex Plateau Essex Plateau Essex Plateau Engineering Geology of British Rocks and Soils – Lambeth Group Aquifer: Status Report 2015, Environment Agency andle alley andle andle alley andle alley alley ondon Gravels ondon ondon Gravels ondon Gravels Gravels Understanding the geological condition of the ground is vital to the implementation of SuDS features, as different ground conditions indicate how SuDS will interact South London with their local environment. Clays and Gravels South London Clays South and London Gravels Clays South and London Gravels Ravensbourne River Valley For example, Clays and Gravels some of London’s Ravensbourne River Valley geological River Valley formations may present risks including: compressible deposits, collapsible deposits, shrink-swell clays, running sand, soluble rocks and landslides. The British Geological Survey (BGS) can provide useful preliminary information. Geotechnical surveys confirm site specific geology. Such information on geotechnical properties, such as permeability, Lower North London porosity Downs Dip Slope and soakage, should Lower be gathered North London as Lower Downs North Dip London Slope baseline data for any Lower Downs SuDS North Dip project. London Slope Lower North London Downs Dip Slope Lower North London Lower Downs North Dip London Slope Lower Downs North Dip London Slope Downs Dip Slope Upper North London Downs Dip Slope Upper North London Upper Downs North Dip London Slope Upper Downs North Dip London Slope Downs Dip Slope 19 2 The London context Downs Dip Slope Ravensbourne River Valley Ravensbourne Ravensbourne South London Pebbly Sands South London Pebbly Sands South London Pebbly Sands Colne Valley Colne Valley South London Pebbly Sands South London Pebbly Sands South London Pebbly Sands South London Pebbly Sands Upper North London Downs Dip Slope Upper North London Upper Downs North Dip London Slope Upper Downs North Dip London Slope Downs Dip Slope South London Pebbly Sands Ruislip Plateau Hayes Gravels Barnet Plateau Hounslow Gravels River Cray River Valley River Cray Valley River Cray Valley Cray Valley Brent Valley Barnet Plateau Lower North Upper London Thames Downs Dip Slope Lower North London Lower Downs North Dip London Slope Lower Downs North Dip London Slope Downs Dip Slope Barnet Plateau Hampstead Ridge Hayes Gravels Upper Thames South Thames Heaths and Commons Finchley Ridge Wandle Valley South London Clays and Gravels Hampstead Ridge Finchley Ridge Lower North London Downs Dip Slope South London Clays and Gravels Upper North London Downs Dip Slope Lea Valley North Thames Terraces Lower Thames Floodplain The geology of London, All London Green Grid, GiGL Lea Valley Lower North London Downs Dip Slope Essex Plateau Ravensbourne River Valley Roding Valley North Thames Terraces South London Pebbly Sands Upper North London Downs Dip Slope Essex Plateau North Thames Terraces Lower Thames Floodplain South London Pebbly Sands River Cray Valley Lower North London Downs Dip Slope Essex Plateau All London Green Grid All London Green Grid All London Green Grid Ecological / Lands Ecological Ecological / Lands Lands Chalk soils Chalk soils Chalk Gravel soils and Sandy hilltops Chalk soils Gravel and Sandy Chalk soils hilltops Gravel Clays and sandy Sandy Gravel hilltop hilltops Sandy Gravel and Sandy Clays Clays hilltops Loams Clays Loams Clays Low level Gravels Loams Flood Plain soils Loams Low Loams level gravels Gravels Annotated Low level plain Gravels Natural Signatures - Natural England Low Flood level Plain Gravels soils Low Flood level Plain Gravels soils Flood Plain soils Flood Plain soils Annotated Annotated Annotated Natural Signatures - Natural En Annotated Natural Signatures Natural En Natural Signatures - Natural En Natural Signatures - Natural En All London Green Grid Ecological / Landscape Zon
Page 1 and 2: SuDS in London - a guide November 2
Page 3 and 4: Introduction
Page 5 and 6: II Who is the guidance for? Primari
Page 7 and 8: 1 Principles of SuDS
Page 9 and 10: 1.2 Wider benefits The ambition for
Page 11 and 12: 1.3.1 Water quantity SuDS mitigate
Page 13 and 14: 1.3.2 Water quality Surface water i
Page 15 and 16: 1.3.4 Biodiversity London’s natur
Page 17: 2.1 What is unique about London? Th
Page 21 and 22: • Amenity/biodiversity: the natur
Page 23 and 24: 2.7 Townscape Townscape is the mix
Page 25 and 26: 2.9 London’s green infrastructure
Page 27 and 28: 2.13 Archaeology London’s history
Page 29 and 30: 3 SuDS components
Page 31 and 32: A number of case studies illustrati
Page 33 and 34: 3.2 Structures Roofs and walls can
Page 35 and 36: Case study 1 - Structures Location
Page 37 and 38: 3.3 Infiltration systems London’s
Page 39 and 40: Case study 3 - Infiltration systems
Page 41 and 42: 3.4 Filter strips Filter strips are
Page 43 and 44: 3.6 Wet swales and dry swales Swale
Page 45 and 46: Case study 5 - Swale Location Mill
Page 47 and 48: Maintenance Channel systems require
Page 49 and 50: Case study 6 - Bioretention Locatio
Page 51 and 52: 3.9 Trees Trees in the hard landsca
Page 53 and 54: Street trees: biodiversity Where tr
Page 55 and 56: 3.10 Permeable paving Permeable pav
Page 57 and 58: Case study 9 - Permeable paving Loc
Page 59 and 60: 3.11 Detention basins Detention bas
Page 61 and 62: 3.12 Attenuation and storage tanks
Page 63 and 64: Design considerations Sedimentation
Page 65 and 66: 4 SuDS in London’s streets
Page 67 and 68: 4.2 Street scenarios Street scenari
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Street scenario 3 An important foca
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Street scenario 5 A well-connected
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Street scenario 7 A local shopping
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5 Case studies
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5.1 Priory Common rain meadow Locat
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5.2 Upminster Bridge swale Location
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5.3 Kenmont Gardens Location Kensal
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5.4 Derbyshire Street Pocket Park L
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5.5 Renfrew Close Location London B
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5.6 Islington Town Hall Location Up
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5.7 Rectory Gardens Location Hornse
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5.8 Talgarth Road Location Talgarth
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5.9 Mile End Green Bridge Location
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5.10 Queen Caroline Estate Location
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5.11 Bridget Joyce Square, Australi
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5.12 Crown Woods Way Location Eltha
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5.13 Hackbridge Location Hackbridge
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5.14 Goldhawk Road Location Shepher
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5.15 Firs Farm Wetlands Location Wi
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5.16 Salmons Brook Glenbrook Stream
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5.17 LuL depot roof, Middlesex Loca
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5.18 A23 Coulsdon Bypass, Farthing
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5.19 London Sustainable Industries
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5.20 Great Kneighton / Clay Farm, C
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5.21 Alnarpsgården Swedish Univers
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5.22 Benthemplein (Water Square) Lo
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5.23 Rue Garibaldi Location Lyon Fr
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5.24 Bo01 Võstra Hamnen Location M
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6 Implementation
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Kings Cross LWT: Camley Street A so
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6.3 Drainage hierarchy SuDS designs
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7 Cost benefit
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7.2 Methodology Cost benefit estima
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4.4 LANDSCAPE WATER MANAGEMENT STRA
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Appendices
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i-Tree Eco Project (2015) Valuing L
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Movement of water from one location
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Heat island Describes urban built u
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Prevention Site design and manageme
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Team The guidance has been produced
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Photo credits 80 Swale sections TfL
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SuDS in London - a guide

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