UKTC Archive

Re: Draft Australian Standard - Protection of Trees on Development Sites

Subject: Re: Draft Australian Standard - Protection of Trees on Development Sites
From: anthony mills
Date: Dec 11 2008 17:07:45
 Nick - I hope I am right in supposing that the structural root zone radius
is 13.44 X the DBH, {nominal 1m diameter  X 50 X 0.42 X 0.64 = 13.44}
rather than the 6 to 15 X DBH for the Australian RPZ  and the 12 X DBH for
BS5837 RPZ, though it says in the definition at 1.4.7 ''this zone considers
a tree's structural stability only, not the root zone required for the
tree's  vigour and long-term viability, which will usually be a much larger
area."   - even though the largest RPZ for mature trees is 15 X DBH as a
radius.
Different RPZ indices for different age classes is useful too...
Regards
Anthony Mills

2008/12/11 Burke Nick (DEL) <Nick.Burke2@xxxxxxxxxx.gov.uk>

Is any one good enough at maths to tell me what SRZ radius = (D × 50)0.42 ×
0.64 m means?




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