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 [Part E – Physical design and materials] Street environment 276 Selection criteria Gravel: Resin bound Gravel: Self binding Grilles Mulch: Inorganic Tree criteria Permeability for air and water to reach the rooting medium High Medium High High High High High Low if correctly maintained Flexibility of material Medium High Low High High High High Medium Risk of damaging young tree health if incorrectly installed High High Medium Low Low Medium Low High Risk of damaging established tree health if incorrectly Low Low High Low Low Low Low Medium installed Risk of damaging young/established tree health if Medium Low High Low Low Medium Low Medium unmaintained Potential to improve soil fertility Low Low Low Low High Low Medium Low Suitability for installation up to the base of a young tree Low Medium Low High High Medium High Low Site criteria Tolerance to regular pedestrian traffic High Medium High Low Low High Low High Resistance to street sweeping machines/animal excavation High Low High Low Low High Low High Effectiveness at suppressing weed growth Medium Medium Low High Medium Medium Low High Availability of different colours/styles High Low High High Low High Low Medium Installation and maintenance criteria Suitability for installation immediately after tree planting Medium Medium High High High Low High Low Likelihood of requiring a subbase prior to installation High Low High Low Low High Low High Level of experience/competence required to correctly High Medium High Low Low High Low Medium install and maintain Expected lifespan of material Medium Medium High Low Low Medium Low High Whole life cost of material, including purchase, installation, maintenance and disposal Mulch: Organic Rubber crumb High Medium Medium Low Low High Low Low Soil Asphalt
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 277 engaged to determine what system/specification is most appropriate. Further guidance concerning irrigation can be found in the London Tree Officers Association (LTOA) guidance document Sustainable Water Management: Trees are part of the solution. For existing trees, a range of surface materials can be used including (but not limited to): • Gravel: Resin bound • Gravel: Self binding • Mulch: Inorganic • Mulch: Organic • Rubber crumb Each surface material has its advantages and disadvantages and no one surface treatment is suitable for all situations. Guidance for material selection can be found in the LTOA document ‘Surface materials around trees in hard landscapes’. The table (below) from the LTOA document should be read in conjunction with it. If planting trees directly into the ground is not possible then it might be appropriate to use raised planters. Many different designs of planter are available and the relevant arboricultural and landscape specialist must be consulted in the selection of the appropriate product. It should be remembered that using planters could have implications on tree health, may attract litter/ vandalism, require a higher degree of maintenance and will constitute an increased irrigation burden. Maintenance Trees differ from other assets in that they often appreciate with age and have less predictable life spans and maintenance regimes than built assets. They must be adequately protected when worked around in accordance with the principles set out in the documents National Joint Utilities Group Guidelines 4 (NJUG4) and British Standard 5837 – Trees in relation to design, demolition and construction. In cases where tree roots are conflicting with footway materials the relevant arboricultural specialist must be consulted to find a suitable solution. This may involve extending the tree pit or manipulating or pruning the roots, although the latter is only to be undertaken on instruction from the relevant arboricultural specialist. Removal of any item of green infrastructure is to be considered only when all other practicable solutions are not viable. If Figure 274: Mature trees on Victoria Embankment
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STREETSCAPE GUIDANCE

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