SuDS in London - a guide

Recommendations

Info

Lessons learned • Detailed surveys of underground services and features are necessary in retrofit situations • A project approach that can adapt to unforeseen constraints makes the construction process more efficient • Crossings and parking bays should be clearly marked Images courtesy of Civic Engineers Tree planting along the carriageway Permeable paving 102 5 Case studies
5.14 Goldhawk Road Location Shepherd’s Bush London Borough of Hammersmith & Fulham Extent 0.27ha Cost £100,000 (construction only) Date 2015 Credits London Borough of Hammersmith & Fulham Robert Bray Associates McCloy Consulting GreenBlue Urban FM Conway SuDS components Kerb inlets Tree pit attenuation Flow control Summary Tree trench planting for attenuation. Project description Street tree planting within the pavement on a busy London high street using a modular structural tree soil system, combined with kerb inlets and flow-control devices. Objectives To provide SuDS functionality and to protect the combined sewer. Actions and results • Each tree is planted within a 1.8m x 1.8m tree pit with tree grille, located within a much larger soil-filled rooting zone beneath the pavement, aiming to provide between 10-20m³ of soil per tree • During heavier rainfall, when the tree pit fills above the weir level, the water flows into a sub-base replacement layer covering the rooting zone just beneath the paving build-up. This distributes the water over the whole rooting zone, allowing it to infiltrate into the soil • Specialist soil with a 25% void ratio allows rainwater storage • Perforated pipes in the base of the construction collect water and direct it to a flow control chamber, which discharges to the combined sewer. The flow control chamber allows water to build up in the rooting zone when it rains to be released slowly once the peak in runoff has passed Image courtesy of George Warren Under construction • Runoff from the adjacent road and footpath flows directly into the tree pit at road level, via a custom kerb inlet • The soil level in the tree pit is lower than the road. It is surrounded by a raised polypropylene weir to allow initial water storage. This ensures the trees get water every time it rains and allows sediments and litter to drop out of the water • Integrated protected overflows ensure the system can discharge freely to the sewer once storage capacity has been reached. Flow rates are designed to reduce the risk of combined sewer overflow events 103 5 Case studies
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 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 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: 5.13 Hackbridge Location Hackbridge
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
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
show all

SuDS in London - a guide

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?