SuDS in London - a guide

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1.3 The four pillars of SuDS SuDS should be based on the four pillars of SuDS design as set out in CIRIA C753 The SuDS Manual 2015. These are: • Water quantity Images courtesy of Jess Bastock • Water quality • Amenity • Biodiversity By managing quality and quantity to meet requirements on the surface, the benefits of amenity and biodiversity generally follow, assuming the SuDS components are well designed. However, where retrofitting SuDS, or where circumstances are particularly constrained or challenging, permeable paving, attenuation tanks and other below-ground features may be the only intervention possible. Of course, in these cases, biodiversity and amenity benefits will be limited. The following pages describe these four pillars in more detail. Quantity: permeable paving, grit jointing Amenity: community planting Quality: reed bed planting Biodiversity: reed bed habitat 10 1 Principles of SuDS
1.3.1 Water quantity SuDS mitigate the impact of everyday rainfall and high-intensity storms by dealing with the same quantity of water over a longer period. This process is called attenuation. Attenuation aims to limit the rate of runoff to the rate which would have existed before the area was developed (that is a greenfield rate). Structures, such as inlets, outlets, weirs and spillways can be used to regulate flow. Water quantity refers to the volume and flow rate of surface water runoff. Restricting the flow of surface water before it can pass through to the next stage of the system alleviates pressure on the sewer system. A comparison between greenfield and urban environments which demonstrates this point on the next page. Quantity: Attenuation, Bo01 Malmö 11 1 Principles of SuDS
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: 1.2 Wider benefits The ambition for
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 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
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3.12 Attenuation and storage tanks
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Design considerations Sedimentation
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4 SuDS in London’s streets
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4.2 Street scenarios Street scenari
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Street scenario 3 An important foca
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Street scenario 5 A well-connected
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Street scenario 7 A local shopping
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5 Case studies
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5.1 Priory Common rain meadow Locat
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5.2 Upminster Bridge swale Location
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5.3 Kenmont Gardens Location Kensal
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5.4 Derbyshire Street Pocket Park L
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5.5 Renfrew Close Location London B
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5.6 Islington Town Hall Location Up
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5.7 Rectory Gardens Location Hornse
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5.8 Talgarth Road Location Talgarth
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5.9 Mile End Green Bridge Location
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5.10 Queen Caroline Estate Location
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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
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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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