SuDS in London - a guide

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Design process diagram adapted from CIRIA C753 The SuDS Manual Local planning policies National/local SuDS guidance & standards Environmental Impact Assessment Community engagement Pre-application discussions Development masterplanning Outline planning permission & conditions Set strategic surface water management objectives Conceptual drainage design Outline drainage design Site Flood Risk/ Consequence Assessment Initial data collection & analysis Detailed data collection and analysis Stakeholder engagement (directly influencing drainage design) Full planning permission Detailed drainage design Key Building regulators approval Drainage system approvals & construction consents Planning process and requirements Drainage design and construction processes Construction, inspection & approval Satisfactory scheme construction Planning processes and requirements not usually relevant for small sites Drainage design and construction processes not usually relevant for small sites Drainage system management Planning data inputs Planning data inputs not always required Data inputs for drainage and construction processes 128 6 Implementation
6.3 Drainage hierarchy SuDS designs should generally be developed according to the CIRIA process diagram on the previous page. This process may vary, depending on local conditions When working in London, water should be managed by using the following drainage hierarchy, as described in the London Plan: 1. Intercept and store rainwater for later use: examples of this include water tanks and butts, or as well as abandoned and repurposed subterranean pedestrian passageways below urban roadways. 2. Use infiltration techniques, such as permeable surfaces: these offer simple and relatively low cost surface water absorption capacity. Permeable surfaces collect, store and release water at different rates, depending on the sort of soil present. Local geological makeup and hydrology should take account of buried infrastructure (such as that associated with London Underground) to ensure chambers do not become water conduits. 1. Disconnected downpipe to water butt 3. Attenuate rainwater in ponds, green or blue roofs or open water features for gradual release: ponds, linear wetlands and basins can create attractive features that provide ecological habitat as well as amenity. There is also scope to incorporate SuDS into green space alongside London’s highways. 2. Grit jointed permeable paving 3. Attenuation in planted rill 129 6 Implementation
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SuDS in London - a guide November 2
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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
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Case study 6 - Bioretention Locatio
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3.9 Trees Trees in the hard landsca
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Street trees: biodiversity Where tr
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3.10 Permeable paving Permeable pav
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Case study 9 - Permeable paving Loc
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3.11 Detention basins Detention bas
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3.12 Attenuation and storage tanks
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Design considerations Sedimentation
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4 SuDS in London’s streets
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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
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 and 100: 5.12 Crown Woods Way Location Eltha
Page 101 and 102: 5.13 Hackbridge Location Hackbridge
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
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Page 127: Kings Cross LWT: Camley Street A so
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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