SEPP 65 - Apartment Design Guide

03 I SitingPerformance criteria3E-1Deep soil zones are suitable for healthy plantand tree growth, improve residential amenity andpromote management of water and air qualityAcceptable solutions1. Deep soil zones meet the requirements as shownin Table 12. Deep soil zones are located to retain existingsignificant trees and allow for the development ofhealthy root systems, providing anchorage andstability for mature trees. Design solutions mayinclude:• basement and sub basement car park designthat does not fully cover the site• use of front and side setbacks• adequate clearance around trees to ensure longterm health• co-location with other deep soil areas onadjacent sites3. On sites with sand, clay, alluvial, transition anddisturbed soils, soil volume is:Tree size Height Spread Soil volumeLarge trees 13-18m 16m 80m 3Medium tree 9-12m 8m 35m 3Figure 3E.3 Deep soil zones promote the growth of larger trees whichimprove amenity and local micro-climatePaving area overdeep soil max 10%Small tree 6-8m 4m 15m 34. On sandy sites with reduced soil volumes, thenumber of trees planted is proportional to availablesoil volumePerformance criteria3E-2Deep soil zones allow for limited servicingand accessAcceptable solutions1. Pedestrian pathways and paving which isspecifically designed for tree root growth occupiesa maximum of 10% of the deep soil zone.See figure 3E.4Deep soil areaFigure 3E.4 Pathways and paving in deep soil zones should bepermeable and limited to 10% of the deep soil zone area2. Services are limited to a maximum 300mmdiameter consolidated services trenchDRAFT | Apartment Design Guide I September 201461