SuDS in London - a guide

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Actions and results • Two rain garden bioretention basins have increased the attenuation storage capacity of the streetscape, reducing the likelihood of water being conveyed to the combined sewer overflow. This measure allowed 30% more water to infiltrate into the subsurface, compared with a conventional grassed area of comparable size • Trees were planted within the de-paved rain garden areas. This addressed the hydrological balance of the site and the impact of noise and air pollution by providing a physical noise barrier and zone for air exchange and particulate accumulation. Special consideration was given to the drainage and growth capacity of each tree Benefits • Reduces street flood risk by increasing attenuation storage capacity • Reduces noise and air pollution • Establishes a new carbon sink through tree planting Lessons learned Modest public realm improvements can promote partnerships between a range of stakeholders After After 100 5 Case studies
5.13 Hackbridge Location Hackbridge London Borough of Sutton Extent 0.27ha Cost £920,000 (total scheme) Date 2014 Credits London Borough of Sutton Civic Engineers Adams & Sutherland SuDS components Permeable paving Bioretention basins Tree planting Filter drains & rills Downpipe disconnection Summary Transformation of street function and traffic flow with integrated green infrastructure. Project description The public realm around the junction of Hackbridge Road and London Road was previously dominated by busy carriageways, with pedestrians confined to narrow footways fronted with shops. Traffic on the carriageway was fast-moving, adding safety concerns to those around noise, air pollution and health and safety. The low-lying topography of the area meant the site was susceptible to surface water flooding. Objectives • Reconfigure the streetscape to make it safer and better for pedestrians • Manage water runoff by installing SuDS • Mitigate air and noise pollution Actions and results • Bioretention basins, including tree planting, provide attenuation for runoff from the reconfigured streetscape • Rills and filter drains with flow control devices regulate the flow of water into tree-rooting zones that provide bioretention • Permeable paving allows for water infiltration into the subsurface, improving capacity during prolonged or high peak flow rainfall events. Up to 40% of the carriageway has been reallocated to permeable paving • Reduced traffic speeds have also improved the pedestrian environment Benefits • Traffic calming; shop frontage enhancement • Surface water flooding in the area has not been observed since the scheme was installed 101 5 Case studies
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SuDS in London - a guide November 2
Page 3 and 4:
Introduction
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II Who is the guidance for? Primari
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1 Principles of SuDS
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1.2 Wider benefits The ambition for
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1.3.1 Water quantity SuDS mitigate
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1.3.2 Water quality Surface water i
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1.3.4 Biodiversity London’s natur
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2.1 What is unique about London? Th
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Hampstead Ridge Valley Lea Valley L
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• Amenity/biodiversity: the natur
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2.7 Townscape Townscape is the mix
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2.9 London’s green infrastructure
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2.13 Archaeology London’s history
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3 SuDS components
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A number of case studies illustrati
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3.2 Structures Roofs and walls can
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Case study 1 - Structures Location
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3.3 Infiltration systems London’s
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Case study 3 - Infiltration systems
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3.4 Filter strips Filter strips are
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3.6 Wet swales and dry swales Swale
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Case study 5 - Swale Location Mill
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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
Page 69 and 70: Street scenario 3 An important foca
Page 71 and 72: Street scenario 5 A well-connected
Page 73 and 74: Street scenario 7 A local shopping
Page 75 and 76: 5 Case studies
Page 77 and 78: 5.1 Priory Common rain meadow Locat
Page 79 and 80: 5.2 Upminster Bridge swale Location
Page 81 and 82: 5.3 Kenmont Gardens Location Kensal
Page 83 and 84: 5.4 Derbyshire Street Pocket Park L
Page 85 and 86: 5.5 Renfrew Close Location London B
Page 87 and 88: 5.6 Islington Town Hall Location Up
Page 89 and 90: 5.7 Rectory Gardens Location Hornse
Page 91 and 92: 5.8 Talgarth Road Location Talgarth
Page 93 and 94: 5.9 Mile End Green Bridge Location
Page 95 and 96: 5.10 Queen Caroline Estate Location
Page 97 and 98: 5.11 Bridget Joyce Square, Australi
Page 99: 5.12 Crown Woods Way Location Eltha
Page 103 and 104: 5.14 Goldhawk Road Location Shepher
Page 105 and 106: 5.15 Firs Farm Wetlands Location Wi
Page 107 and 108: 5.16 Salmons Brook Glenbrook Stream
Page 109 and 110: 5.17 LuL depot roof, Middlesex Loca
Page 111 and 112: 5.18 A23 Coulsdon Bypass, Farthing
Page 113 and 114: 5.19 London Sustainable Industries
Page 115 and 116: 5.20 Great Kneighton / Clay Farm, C
Page 117 and 118: 5.21 Alnarpsgården Swedish Univers
Page 119 and 120: 5.22 Benthemplein (Water Square) Lo
Page 121 and 122: 5.23 Rue Garibaldi Location Lyon Fr
Page 123 and 124: 5.24 Bo01 Võstra Hamnen Location M
Page 125 and 126: 6 Implementation
Page 127 and 128: Kings Cross LWT: Camley Street A so
Page 129 and 130: 6.3 Drainage hierarchy SuDS designs
Page 131 and 132: 7 Cost benefit
Page 133 and 134: 7.2 Methodology Cost benefit estima
Page 135 and 136: 4.4 LANDSCAPE WATER MANAGEMENT STRA
Page 137 and 138: Appendices
Page 139 and 140: i-Tree Eco Project (2015) Valuing L
Page 141 and 142: Movement of water from one location
Page 143 and 144: Heat island Describes urban built u
Page 145 and 146: Prevention Site design and manageme
Page 147 and 148: Team The guidance has been produced
Page 149 and 150: Photo credits 80 Swale sections TfL
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SuDS in London - a guide

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