SuDS in London - a guide

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Actions and results • Plot-wide rainwater harvesting system intercepts rainwater, reducing the amount being conveyed to the subsequent stages of the SuDS scheme • Detention basins increase the attenuation storage capacity of the scheme and slows water flow, particularly during prolonged and/or high peak rainfall • Swales increase the attenuation storage capacity of the scheme and provides vegetated landscape of hydrological, aesthetic and biodiversity value • Hydrodynamic vortex separators inhibit the discharge of sediment and hydrocarbons into the Hobson’s Conduit outflow. This is of particular note due to the downstream function of Hobson’s Conduit in Cambridge Benefits • Impact of development on surrounding drainage infrastructure is minimised through the management of water on site • Outflow of water quality and volume controlled • Can withstand a one in 100 year flood event Image courtesy of Tim Crocker • Bioretention basins allow water to be attenuated on the east side of Hobson’s conduit, preventing low quality water from discharging into the watercourse. Water is conveyed from the development to the west, underneath Hobson’s Conduit into the bioretention basins, creating a series of ponds and wetlands of hydrological, recreational and ecological value • Permeable paving increases the permeability on the site, where below-ground conditions allow • Sub-catchments syphons underneath the brook discharge into a series of ponds and detention ponds • Predominantly above-ground nature of the SuDS features contribute to the recreational and aesthetic value of the development • 20,000m² of wetland habitat created • Installation of a landscape of multiple benefits Lessons learned • Engaging developers and project teams early in the development process allows the benefits of SuDS to be shared • Treat each site within the development individually to capture the variations in soil type and topography Completed residential unit • Pre-cast concrete rills convey water into bioretention basins in the local square 116 5 Case studies
5.21 Alnarpsgården Swedish University of Agricultural Sciences Location Alnarp Sweden Extent 0.37ha Cost £170,000 (construction only Date 1997 Credits Anders Folkesson, Landscape Architect LAR/MSA Vasajorden AB SuDS components Ponds and wetlands Disconnected downpipes Permeable paving Channels & rills Retention basin Wildflower seeded joints Summary Campus courtyard redevelopment to focus on sustainable drainage while creating a social hub. Project description Alnarpsgården is a rural campus hosting the Institution of Landscape Architecture, Planning and Management at the Swedish University of Agricultural Sciences (SLU). Part of a historic estate, it consists of buildings converted from agricultural use and new builds, set within a forested landscape. The focus of the campus is the inner courtyard, which has been redeveloped with SuDS principles in mind. Objectives • Slow water runoff from roofs and hard surfaces of Alnarpsgården • Provide a first step of water cleaning • Enhance the appearance of the yard • Demonstrate an open stormwater system to the landscape architect students of SLU Actions and results • Water from downpipes is collected in channels running along the facades, then led to a retention basin (a former manure container). At the bottom of the concrete basin are ‘seams’ in which aquatic plants grow in a strict pattern. From the retention basin, water runs in a ditch towards the Íresund coast • Grit-jointed granite setts form permeable paving, over-seeded with wildflowers Benefits • The courtyard design repurposed existing features, such as the old manure container and dung grooves, as SuDS features • The redevelopment of the courtyard has created a social hub, well used by students and visitors • The success of the SuDS components of the courtyard make them a valuable educational tool 117 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
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3.11 Detention basins Detention bas
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3.12 Attenuation and storage tanks
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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
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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 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: 5.20 Great Kneighton / Clay Farm, C
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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