SuDS in London - a guide

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Images courtesy of J & L Gibbons Benefits • Increased attenuation storage capacity • Improved water quality • Enhanced public realm and green infrastructure • Enhanced civic function of the forecourt • Tree-planting for improved air quality Lessons learned • Permeable surface treatments can successfully address shared space requirements • An integrated SuDS scheme can have environmental and economic benefit After After 88 5 Case studies
5.7 Rectory Gardens Location Hornsey London Borough of Haringey Extent 1,000m² Cost £80,000 Date 2016 Credits Haringey Council Robert Bray Associates Thames21 Hugh Pearl (Land Drainage) Ltd SuDS components Retention basins Detention basins Planted channels Plan Summary Retrofit and transform green space to manage road runoff. Project description Runoff flows directly to the River Moselle via a surface water sewer connection. An existing local park was identified for accommodating SuDS components that enhanced amenity and biodiversity value. Objectives The project aims to collect all the runoff from a defined road catchment and show how the full SuDS aspiration of ‘managing quality and quantity aspects of runoff while delivering amenity and biodiversity benefits’ can be met in an existing urban park setting. Actions and results • Runoff from the road is collected in three bespoke, cast iron inlets that replace gully pots and perform like chute gullies, delivering the dirty surface water into two SuDS management drains • System A to the west, delivers runoff to a silt interception forebay basin • In System B, runoff travels along a grass channel, which is planted so oils and silts are concealed but is easily accessible to remove solids • The ‘source control’ features are followed by wildflower meadow basins that can hold significant amounts of reasonably clean runoff to the one in 10 year return period • An under-drain below the basins allows water to leave the site at a greenfield rate. This flow is governed by a protected orifice control chamber. • In larger storms, up to the one in 100 year return period, with a 30% allowance for climate change, these basins overflow into further grass storage basins. The second basins are managed as amenity grass so are accessible most of the time • The wildflower meadow basins have balance beams so that even when wet or filled with water they can be used for adventure play Benefits 89 5 Case studies
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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
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
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: 5.6 Islington Town Hall Location Up
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
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
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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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