SuDS in London - a guide

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Images courtesy of LU Infrastructure Protection Benefits • LUL will examine the process of installation, maintenance and performance and the cost-benefit analysis in terms of waterproofing performance and drainage control for a larger scale application • LUL will also assess: longevity of the waterproofing layer; improved working ambiance and environment; structure insulation; air quality improvements; biodiversity enhancements Programme of monitoring Early green roof growth within 6 months • The trial will allow better understanding of the mechanism and potential areas for improvement Lessons learned • The use of wool as a recycled drainage material was an important outcome • Monitoring of water attenuation is complete and will inform future green roof schemes • Organic material used as a drainage board has performed consistently better than the conventional plastic one • Maintenance is minimised due to planting selection of wildflowers 110 5 Case studies
5.18 A23 Coulsdon Bypass, Farthing Way Location Coulsdon London Borough of Croydon Extent 34ha Cost £33m (Total scheme) Date 2006 Credits TfL Atkins SuDS components Kerb drainage Soakaways Filter strip Filter drains Filter strip gravel Summary Highway runoff attenuation. Project description A groundwater extraction borehole at Smitham Pumping Station is located in Coulsdon Town Centre. The new section of A23 between Marlpit Lane and Smitham Station passes across the inner Source Protection Zone (SPZ) for the extraction borehole and has been designed to direct runoff appropriately. Objectives • The drainage design redirects runoff flowing from the new A23 away from the inner SPZ • Attenuation was needed to ensure the area receiving the runoff can cope with the volume of water it now receives Actions and results • The new A23 is drained, via a piped system with kerbs and gullies, into spillage containment devices and a full retention fuel/oil separator, before discharging into soakaways • To the west of the new A23, the existing ground rises steeply; being chalk downland, there is likely to be significant runoff when it rains heavily. A separate system, not linked to the highway drainage, collects this runoff and discharges it into soakaways • Non-piped drainage components within the site principally relate to linear soakaways at the bottom of the embankment adjacent to footways where water is caught at a low point Benefits • The design maintains the flow of previously-existing drains and watercourses • The design of the drainage components allows them to be maintained in a safe and efficient manner • Surface water is able to drain into soakaways on adjacent land Lessons learned • Localised design changes were necessary, due to the unexpected presence of services 111 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
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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
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 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: 5.17 LuL depot roof, Middlesex Loca
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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