UKTC Archive

RE: Diameter callipers

Subject: RE: Diameter callipers
From: willross583@xxxxxxxxxxx.com
Date: Aug 16 2019 08:17:21
Paul,
          Could you please add the link, it seems to have done a runner in 
the ether.

Will

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Paul Barton
Sent: 16 August 2019 06:30
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Diameter callipers

I’ve heard it said that the stem diameter to root volume theory is an 
extension of the ‘pipe theory’ which attempts to link stem thickness with 
foliar volume - see link.

I am not too sure where the 12 x multiplier emanated from though.

Kind regards,

Paul Barton
MSc, BSc (Hons), TechCert (ArborA) MArborA

Director | Barton Hyett Associates Ltd
Website: www.barton-hyett.co.uk
Tel: 01386 XXXXXX
Mobile: 07765 XXXXXX
Office 5E, Deer Park Business Centre, Eckington, Pershore, Worcestershire, 
WR10 3DN

Company Reg No: 7110670 Registered in England and Wales.
A copy of our GDPR Privacy Notice can be found on our website by clicking on 
this link.
On 15 Aug 2019, 22:39 +0100, Wayne Tyson <wt750mv@xxxxxx.com>, wrote:
Thank you, Bill Kowalczyk, for your summary.

Perhaps you can further enlighten me.

What was/is the basis for the "rule of thumb"?

Is the 12 x stem diameter "rule" based on the tree's dbh at maturity?

Regarding ". . . roots beyond this zone may get trammelled *without 
significant negative impacts* [[Italics mine]]on the health and 
vitality of retained trees," on what basis was that determined?

Cheers,
Wayne

On Thu, Aug 15, 2019 at 5:49 AM Bill Kowalczyk 
<bill@xxxxxxxxxxxxxxxxx.co.uk>
wrote:

Hi Wayne,

The oft quoted British Standard; "BS5837:2012 - Trees in relation to 
design, demolition and construction” came up with a calculation for 
recommended root protection areas (RPA), which works out at a radius 
of 12 x stem diameter (but measured at 1.5m for some peculiar 
reason) for most single stemmed trees.

In practice, with most trees, this invariably comes to about the 
same as measuring to the “drip-line” of the canopy edge, and accepts 
that roots beyond this zone may get trammelled without significant 
negative impacts on the health and vitality of retained trees.

It’s a bit “rule of thumb” developed by the working group who first 
came up with the standard back in the early 1990’s, but it’s all 
we’ve got and better than nothing.

Cheers,

Bill

On 14 Aug 2019, at 23:55, Wayne Tyson <wt750mv@xxxxxx.com> wrote:

What does dbh have to do with RPA? What are the standards and upon 
what data doth they rest? Protection from what, for example? That 
is, in the simplest terms, other than dbh how are RPA's determined?




--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy 
http://www.boskytrees.co.uk/




--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy 
http://www.boskytrees.co.uk/



--
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy 
http://www.boskytrees.co.uk/




-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by Bosky Trees arboricultural consultancy
http://www.boskytrees.co.uk/