SuDS in London - a guide

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Community event Actions and results • Green roofs on bike sheds and a bin store increases the attenuation storage capacity, improving the streetscape’s ability to mitigate impacts during high and/or prolonged peak flow events • Disconnecting downpipes on Oxford House increased attenuation storage capacity by redirecting water away from the combined sewer overflow and conveying it into bioretention basins and a new swale • Permeable paving allows water to seep into the ground. During high and/or prolonged peak flows, additional runoff is attenuated by the surrounding SuDS scheme • A network of rain gardens, swales and engineered tree pits has increased the attenuation storage capacity of the streetscape • A bespoke information board communicates the streetscape and community benefits of the scheme leading to continued community buy-in to the maintenance and monitoring of the scheme Benefits • Inhibits the flow of storm water runoff into the combined sewer system • Community partnerships have safeguarded future management and maintenance • New community resource created • Native and edible plants promote biodiversity and a social capital • Able to withstand a one in 100 year rainfall event Lessons learned • Active engagement between the community and local authority has social and economic value • SuDS can help define and enhance public realm improvements that relate to pedestrian and cycle routes • Permeable block paving is susceptible to gathering litter fragments, so the jointing of paving systems needs consideration • Connectivity with Weavers Field could have further enhanced the scheme 84 5 Case studies
5.5 Renfrew Close Location London Borough of Newham Extent 900m² Cost £43,000 (construction only) Date 2015 Credits Groundwork Environment Agency Robert Bray Associates Greatford Garden Services SuDS components Detention basins Bioretention basins Tree planting Channels Downpipe disconnection Swales Summary Transformation of green space to multifunctional green infrastructure for the estate. Project description An existing communal green space between residential blocks was retrofitted with a SuDS scheme. The rain gardens receive water from hard surfaces at roof and ground level and from soft surfaces at ground level. Objectives • Provide a sustainable drainage function and alleviate flooding • The rain gardens should create attractive, productive and biodiverse green spaces for the residents Actions and results • Bioretention basins designed to take road and roof runoff • Downpipes and rainwater conveyed to swales and bioretention basins Images courtesy of Robert Bray Associates • Swale network to accommodate different sized rainfall events • Visual amenity provided by rain gardens Channel outflow into swale and bioretention basin 85 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
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
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: 5.4 Derbyshire Street Pocket Park L
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
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
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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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