SuDS in London - a guide

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Benefits • Can withstand a one in 100 year + 30% storm event • Runoff from 750m² of roof and 165m² from roads are attenuated in the scheme • 12-hour delay between rainfall event and pressure recording in the basin • 16-hour delay between peak rainfall and peak pressure in rainfall basin for first event Lessons learned • Monitoring system installed and used to support the design of future SuDS retrofit projects should try to direct flows from known problem areas into bioretention basins to prevent surface flooding After • Maintenance agreements need to be in place along with a clear method of reporting Channel detail 86 5 Case studies
5.6 Islington Town Hall Location Upper Street London Borough of Islington Extent 1,000m² Cost £100,000 Date 2011 Credits London Borough of Islington J&L Gibbons SuDS components Permeable paving Large specie tree planting De-paving Before Summary Transformation of a car park into a green public space for community and ceremonial events. Project description Islington Town Hall is on Upper Street which is populated by shops, bars and cafes and attracts heavy footfall. Before the redesign, the forecourt of the town hall was a car park with impermeable surfaces. This had implications for the management of stormwater runoff onto Upper Street’s carriageway and for combined sewer overflow. A political incentive to ‘green’ the town hall forecourt initiated the scheme as part of Islington’s sustainable agenda. This was coupled with recognition of the poor presentation of the building to the street. These were key factors in the project gaining support. It shows how small public realm interventions can address car parking issues and storm water runoff, while transforming a space and improving the public realm. Objectives • Enhance the town hall’s setting as a key civic location • Provide a high quality public realm on Upper Street • Address car parking issues, while maintaining a suitable setting for ceremonial events • Plant large species trees for long-term benefit Actions and results • Permeable paving surfaces allow water to seep directly into the sub-base, thereby redirecting excess and polluted water away from the combined sewer • Trees and planting provide canopy cover, increasing the interception of rainwater and enhancing biodiversity • De-paved and planted surfaces increases attenuation by maximising areas for infiltration 87 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
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 and 84: 5.4 Derbyshire Street Pocket Park L
Page 85: 5.5 Renfrew Close Location London B
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
Page 135 and 136: 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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