BSI 24/30447974 DC 2024

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Draft BS 8640. Structural and supported soils for trees in hard landscapes. Guide

Published By	Publication Date	Number of Pages
BSI	2024	40

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PDF Catalog

PDF Pages	PDF Title
1	30447974 (2).PDF
3	30447974 (1).pdf
5	Introduction 1 Scope 2 Normative references
6	3 Terms and definitions 3.1 biochar 3.2 compost 3.3 field capacity 3.4 hard landscape 3.5 hydrogel 3.6 non-load bearing soil 3.7 planting pit
7	3.8 root flare 3.9 rootable volume 3.10 sand-based structural soil 3.11 soft landscape 3.12 soil cell 3.13 soil compaction 3.14 stone-based structural soil
8	3.15 sustainable drainage systems (SuDS) 3.16 sump 3.17 tree pit 3.18 wilt point 4 Soil volumes 4.1 The importance of soil volume for tree growth 4.2 Soil volume requirement
9	4.3 The planting pit
10	5 Non-load-bearing soils (protected soils) 5.1 General Specifications for limits on sharps and plastics should be in accordance with BS 8601.
11	5.2 Soil criteria Supported or non-structural topsoil and subsoils used in tree pits generally conforms to BS 3882 and BS 8601, respectively. However, soils with the values set out in Table 2 have been formulated to allow for better aeration and deeper rooting. Topsoil…
13	5.3 Handling 6 Sand-based structural soils (urban tree soils) 6.1 General
15	6.2 Placement and handling
16	7 Structural soils (stone-based structural soils) 7.1 General
17	7.2 Types of tree pits that use structural soils 7.2.1 The Stockholm system 7.3 Different types of structural soil mixes 7.3.1 Biochar, compost and hydrogel
18	7.4 Suitable aggregate for use in structural soils 7.5 Fines content
19	7.6 Installing tree pits using stone-based structural soils
20	8 Drainage and irrigation 8.1 Drainage 8.2 Irrigation 8.2.1 General
21	8.2.2 Active
22	8.2.3 Passive 9 Inclusion of sustainable drainage system (SuDS) 9.1 General
23	9.2 Hydraulic design criteria
24	9.3 Infiltration
25	9.4 Discharge 9.5 Hydraulic characteristics: surfacing
26	9.6 Hydraulic characteristics: SuDS soil 9.7 Hydraulic characteristics: drainage layer 9.8 Geotextile 9.9 Geomembrane 9.10 Formation
27	9.11 Inlets
29	9.12 Bioretention tree pits
32	10 Rootable volume
34	11 Root management and working around services
35	12 Soil amendments (including biochar) 12.1 Organic matter 12.2 Biochar
36	12.3 Fertilisers
37	Annex A (informative) Soil factors affecting tree establishment in the built environment A.1 General A.2 Ecosystem services