That's handy Dave - the first time I've heard a credible explanation. Mind
you, why was 1.5 chosen for CAs ... ?
Jim
-----Original Message-----
From: Scott Cullen [mailto:dscottcul@xxxx.net]
Sent: 27 April 2012 10:39
To: UK Tree Care
Subject: Re: BS5837 and stem diameter
----- Original Message -----
From: David C Dowson
To: UK Tree Care
Sent: Friday, April 27, 2012 4:01 AM
Subject: BS5837 and stem diameter
DD I once asked the question of an authority Mr R Nicholson why 1.5m from
ground level which is called stem diameter in 5837 not dbh. Dbh has never
appeared in 5837 and it would be incorrect to use it any work related to
5837 in my opinion.
SC Ah I hate when a post comes in just after I've hit send. That is useful
info. In that just sent post I'd said "the reader is going to expect a
report prepared to standard is going to use terminology from the standard,"
so indeed a 5837 report should say "stem diameter." It does raise the
question of whether a particular reader or audience might expect "DBH" and an
expert knowing that might add a footnote about DBH.
DD Anyway the answer is - 1.5m as this is the height at which trees are
measured when determining stem diameter for thinning operations in relation
to designated Conservation Areas. That was taken on as the height for 5837
work.
SC That of course raises the question of why 1.5m used in those CA thinning
operations. Conventions are conventions and that's fine. It just might be
useful to know if there was a less arbitrary, technical reason to vary from
1.3m.
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