SuDS in London - a guide

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Bioretention rain garden in Vauxhall Design considerations Edge protection: typically, bioretention components are sited below pavement surface levels and can hold standing water. It is therefore important that the interface with pedestrian and vehicular movement is carefully considered. Bioretention can be profiled in various ways, with soft edges and gentle side slopes, or hard edges and vertical sides. Inlets: inlets may be necessary, especially when hard edge protection is required. Erosion at inlet points can be prevented by reducing the surface water flow velocity via a sediment trap or a reinforced and textured zone. Protection grilles should not be used unless the inlet diameter is greater than 350mm. An outfall provides overflow when heavy rainfall means infiltration into the soil is too slow. Erosion: bioretention systems aim to catch flowing surface water. Soft landscapes may suffer erosion, so design the feature to control the surface water runoff movement through the use of weirs, check dams, erosion control matting and planting. Pollution/contamination: pollution and contamination sources affecting surface and ground water may affect planting, so the planting specification should be designed to meet the site conditions. Bioretention systems can remediate water contaminants with the use of filtration mediums, normally sand-based material with a source of organic matter to provide nutrients for planting. Sedimentation: slowing surface water flow allows fine particles to be removed. Design should limit excessive sediment accumulation that could reduce storage volume, filtration and infiltration rates. Exceedance: bioretention systems can deal with only small catchment areas and are likely to be overwhelmed during heavy storms. The design should therefore allow for contingency flow paths and/or provide outfall. Outfalls: if an outfall is required, consider the location, particularly the relative level of potential discharge locations, as bioretention system outfalls can be deep compared to conventional drainage. Maintenance Bioretention systems require routine site maintenance operations to ensure efficient operation. Inlets and outfalls require periodic inspection. Useful design guidance CIRIA C753 The SuDS Manual, Chapter 18 48 3 SuDS components
Case study 6 – Bioretention Location Swan Yard London Borough of Islington Date 2013 Images courtesy of J & L Gibbons SuDS components Bioretention planter Objectives A small office redevelopment has included SuDS components within a limited space to intercept and attenuate rainwater. Outcome Previously, roof rainwater discharged directly into the street. The most effective way to incorporate SuDS has been by diverting and disconnecting downpipes to feed rainwater into bioretention planters and water butts for irrigation. The planting adds a small element of self-sustaining biodiversity in an otherwise hard paved yard. Before After 49 3 SuDS components
Page 1 and 2: SuDS in London - a guide November 2
Page 3 and 4: Introduction
Page 5 and 6: II Who is the guidance for? Primari
Page 7 and 8: 1 Principles of SuDS
Page 9 and 10: 1.2 Wider benefits The ambition for
Page 11 and 12: 1.3.1 Water quantity SuDS mitigate
Page 13 and 14: 1.3.2 Water quality Surface water i
Page 15 and 16: 1.3.4 Biodiversity London’s natur
Page 17 and 18: 2.1 What is unique about London? Th
Page 19 and 20: Hampstead Ridge Valley Lea Valley L
Page 21 and 22: • Amenity/biodiversity: the natur
Page 23 and 24: 2.7 Townscape Townscape is the mix
Page 25 and 26: 2.9 London’s green infrastructure
Page 27 and 28: 2.13 Archaeology London’s history
Page 29 and 30: 3 SuDS components
Page 31 and 32: 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: Maintenance Channel systems require
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 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
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5.12 Crown Woods Way Location Eltha
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5.13 Hackbridge Location Hackbridge
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5.14 Goldhawk Road Location Shepher
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5.15 Firs Farm Wetlands Location Wi
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5.16 Salmons Brook Glenbrook Stream
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5.17 LuL depot roof, Middlesex Loca
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5.18 A23 Coulsdon Bypass, Farthing
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5.19 London Sustainable Industries
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5.20 Great Kneighton / Clay Farm, C
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5.21 Alnarpsgården Swedish Univers
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5.22 Benthemplein (Water Square) Lo
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5.23 Rue Garibaldi Location Lyon Fr
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5.24 Bo01 Võstra Hamnen Location M
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6 Implementation
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Kings Cross LWT: Camley Street A so
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6.3 Drainage hierarchy SuDS designs
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7 Cost benefit
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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
Page 147 and 148:
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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