STREETSCAPE GUIDANCE

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HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance Green walls Vertical green walls using rainwater runoff from roof systems can play an important part in improving the streetscape. However, there is a high cost associated with the installation and maintenance of green walls. Therefore careful consideration is required at early design stages to whole life costs. All green wall proposals need SDRG approval. Figure 284: Edgware Road green wall The Stockholm Solution Stockholm, Sweden Creating healthier street trees through water attenuation Key functions Opportunity Trees in Stockholm, Sweden, have been used as part of a cost-effective system to manage excessive stormwater runoff. [Part E – Physical design and materials] Street environment 290 Benefits Stormwater tree trench systems reduce the reliance on existing drainage systems, improve safety by removing water ponding from footways and carriageways, and reduce splashing from passing vehicles. Implementation The trees are connected by an underground infiltration structure. Under the pavement, a trench is created and lined with permeable fabric and filled with stone or gravel. Stormwater runoff flows through a special inlet (storm drain) leading to the stormwater tree trench. The runoff is stored in the empty spaces between the stones, watering the trees and slowly infiltrating through the bottom. If the capacity of this system is exceeded, stormwater runoff can bypass it entirely and flow into an existing street inlet. Image courtesy of Wolf Paving Company, Inc. Applying in London Stormwater tree trenches should be considered in areas that are prone to flooding. This type of infrastructure should be investigated in Opportunity Areas and areas of regeneration.
HOME INTRODUCTION PART A A vision for London’s streets PART B From strategy to delivery PART C New measures for new challenges PART D Balancing priorities PART F Appendix PART E Physical design and materials SECTION 6 Introduction SECTION 7 High quality footways SECTION 8 Carriageways SECTION 9 Crossings SECTION 10 Kerbside activity SECTION 11 Footway amenities SECTION 12 Safety and functionality SECTION 13 Street environment SECTION 14 Transport interchanges Streetscape Guidance [Part E – Physical design and materials] Street environment 291 Porous pavement trial London, UK Water attenuation for safer streets Key functions Opportunity Porous pavements offer highway authorities and developers a new tool to manage stormwater by allowing it to drain through the pavement surface into a stone recharge bed and infiltrate into the soils below. Benefits Porous materials remove excess water from carriageways and footways, improving driving conditions in wet weather and reducing splashing from moving vehicles. Implementation Porous pavements work by providing the water with a place to go, usually in the form of an underlying, open-graded stone bed. As the water drains through the porous asphalt and into the stone bed, it slowly infiltrates into the soil or to an attenuation system. The stone bed size and depth must be designed so that the water level never rises into the asphalt. This stone bed, often 450mm to 900mm in depth, provides a tremendous subbase for the asphalt paving. Image courtesy of Wolf Paving Company, Inc. Applying in London Porous pavements are being trialled on the TLRN to determine if their use is appropriate and under what circumstances. We will publish results when the trial is complete.
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STREETSCAPE GUIDANCE

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