UKTC Archive

RE: Tree Root Literature

Subject: RE: Tree Root Literature
From: Mark Mackworth-Praed
Date: Nov 04 2019 17:36:18
Hi Michael & Bill

The Mattheck/Breloer 'formula' for structural root plate radius is/was 
3.5-4.0 times trunk diameter - if I remember rightly, their argument was that 
the fatter the tree, the more it relies on the dead weight of its own trunk 
to support it, but I've always assumed the 4 X diameter, in order to be on 
the safe side. The other paper that might be worth looking at is Gasson and 
Cutler 'Tree Root Plate Morphology', Arboricultural Journal 1990, Vol 14 No. 
3, pp 193-264, which analysed results from the Kew tree root survey following 
the October 1987 storm in SE England. The tree species & soil types they 
looked at might not be applicable/transferable to the case you're looking at 
though, I guess, but it might be some help nonetheless.

Kind regards
Mark M-P

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Bill Kowalczyk
Sent: 04 November 2019 13:31
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Re: Tree Root Literature

Hi Michael

I remember (not so much these days!) about 20 years, or so, ago Claus 
Mattheck came up with calculation for minimum rootplate diameter in relation 
to stem size to maintain the structural integrity with regards to wind-throw.

I don’t have my books to hand, but it might be a pointer in the right 
direction…

Regards,

Bill

On 3 Nov 2019, at 12:41, Michael Richardson <richardsontreecare@xxxxxx.com> 
wrote:



3) method of *visual* inspection to determine the size of root plate 
necessary to remain stable under wind loads





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