SuDS in London - a guide

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Benefits • Combines benefits of large tree rooting zones with their ability to store runoff, with little modification • SuDS scheme introduced in a demanding, fully-paved urban location Image courtesy of LBHF Lessons learned • Detailed surveys of underground services and features and careful analysis is essential in retrofit situations Image courtesy of Robert Bray Associates Tree pit details Plan showing modular soil system Completed scheme 104 5 Case studies
5.15 Firs Farm Wetlands Location Winchmore Hill London Borough of Enfield Extent 0.48ha Cost £900,000 (total scheme) Date 2016 Credits Enfield Council Environment Agency Thames Water TfL Sustrans GLA Thames 21 Friends of Firs Farm SuDS components Ponds and wetlands Summary Open space transformation with wetland habitats to improve water quality outflow. Project description The main driver for the wetland creation was Enfield Council’s desire to improve water quality in Pymmes Park Lake, where Moore Brook outfalls before entering Pymmes Brook. Moore Brook is a lost watercourse within a surface water sewer. Firs Farm was identified as a space suitable for the creation of a wetland scheme. The watercourse was de-culverted and diverted to a series of open watercourses, wetlands and ponds to improve water quality. Objectives • Improve water quality alongside flood alleviation, habitat enhancement, community space provision and creating cycleway links • Provide intensive monitoring programme to be carried out by Thames21/Enfield Council over next two to three years to determine the impact of wetlands on reducing diffuse urban pollution. This data will be used to optimise future management of the two sites Actions and results • Northern and southern branches of Moore Brook are diverted from their culverted courses to three combined wetland cells • Cells channel the water for treatment through flow paths • A watercourse downstream connects to a fourth cell which is built as a pond, before continuing downstream in an open channel to the original culvert • Surface water is treated at the surface before re-entering the culvert downstream, improving the quality of the water which outfalls at Pymmes Park Lake • A further diversion to four more wetland cells at Pymmes Park upstream of the lake provides further treatment Benefits • Water quality improvements before discharge to river further down the catchment • A surface system allows for issues to be identified and easily dealt with due to the size and location of the SuDS elements 105 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
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
Page 99 and 100: 5.12 Crown Woods Way Location Eltha
Page 101 and 102: 5.13 Hackbridge Location Hackbridge
Page 103: 5.14 Goldhawk Road Location Shepher
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
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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