SuDS in London - a guide

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• Retrofit demonstrates how polluted runoff can be practically managed in an existing local park or urban green space, while enhancing amenity and biodiversity • The small interception forebays provide a simple way of trapping and removing pollutants, such as silt and heavy oils • The changes of level in the park landscape enhance the quality of the space, while defining the SuDS and biodiversity features • The under-drain ensures the basins are dry most of the time, but the rainwater irrigates both trees and the meadow, particularly in summer when many urban park landscapes suffer drought • Water-play in a safe place helps the community relate positively to normal rainfall and to appreciate the impact of heavy storms in summer when the basins fill Lessons learned • The project was undertaken with the Priory Common rain meadow (case study 5.1) and therefore benefited from sharing expert site supervision and a knowledgeable contractor • Protecting planted channels where water entered the SuDS and the relatively flat basins reduced erosion to a minimum • Physical protection of the basins was considered but not used for reasons including visual quality, risk of vandalism and cost. It may be necessary to overseed the basins when germination of the wildflower seed is inspected • The client partnership (Thames21 and Haringey Council) are currently considering monitoring opportunities • It would be useful to estimate natural losses at different times of year in different weather conditions After Images courtesy of Robert Bray Associates • Signs provide information about the components and benefits of SuDS to passers-by • The quality of runoff should be easy to assess by collecting it as it passes through the control chambers Swale 90 5 Case studies
5.8 Talgarth Road Location Talgarth Road London Borough of Hammersmith & Fulham Extent 1200m² Cost £240,000 (total scheme) Date 2016 Credits London Borough of Hammersmith & Fulham FM Conway SuDS components Bioretention basin Tree planting Summary Green infrastructure enhancements on the highway to improve air quality. Project description This project saw green infrastructure installed alongside a footway and cycle path along Talgarth Road between Butterwick and Shortlands, to the north of the Hammersmith Flyover. The project intends to reduce the exposure of pedestrians and cyclists to the poor air quality in Hammersmith town centre, while incorporating SuDS and providing a safe and secure setting. The aim is to replicate this approach elsewhere in the borough. Objectives • Improve air quality with integrating SuDS • Planting Miscanthus (silvergrass) to act as a filter to traffic emissions. This grass grows to 1.8m and provides a soft, visibly permeable border, to ensure a sense of safety Actions and results • Some trees along this stretch were in a poor state and needed to be replaced. Others were removed to allow a cycle path to be repositioned • A 26m section of the roadside planting has been designed to accept runoff from the highways and footway, thus reducing the surface water flow to the combined sewer and providing additional capacity within the Counter's Creek Catchment • The bioretention basin will be deeper than the other stretches of planting to provide underground attenuation for the surface water flows, with a controlled release to the sewer • Exceedance flows, during extreme events, are directed towards the existing road gully • Roadside bioretention basins incorporate bespoke roadside inlets • A border of herbaceous groundcover will be planted between the Miscanthus and the bicycle path 91 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
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 and 86: 5.5 Renfrew Close Location London B
Page 87 and 88: 5.6 Islington Town Hall Location Up
Page 89: 5.7 Rectory Gardens Location Hornse
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
Page 137 and 138: Appendices
Page 139 and 140: 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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