UKTC Archive

Re: [EXTERNAL] Tree failure potential assessment study WAS Civil cases for nuisance or damage to property

Subject: Re: [EXTERNAL] Tree failure potential assessment study WAS Civil cases for nuisance or damage to property
From: Wayne Tyson
Date: Jan 14 2020 20:31:00
Then "arbs" have a long way to go. "They" haven't scratched the surface of
science, and if by "judgment" you mean "experience," they are settling for
far too little. There are WAGs and SWAGs, but show me some DATA! That is,
*discipline*! Where are the actual studies that can back up "judgment?" I
can't find 'em. The tree professions *can* get better and better, if the
individuals in it want to. Show me an "expert" and I'll show you a fool. At
the very least, the profession can move from "imminent" to recognizing
unstoppable trends.

On Tue, Jan 14, 2020 at 11:42 AM Jim Quaife <jq@xxxxxxxxxxxxxxxxx.co.uk>
wrote:

Nice idea Wayne, but no chance of enactment. By and large root systems are
over-designed in nature, and root severance is a matter of judgement and
not law.  BS5837 advocates the removal of perhaps two-thirds of a tree's
root system. There are any number of instances where roots have been
severed to an extent that raises eyebrows and yet the tree doesn't miss a
beat.
Of course there are converse examples, but I have been in situations where
a single root is deemed to be important and when one looks at what else is
sustaining the tree, that notion is frankly ridiculous.
Like everything else to do with trees, root severance is a matter of
judgement and justification.  This is an arb's stock in trade!
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:
uktc-request@xxxxxx.tree-care.info] On Behalf Of Wayne Tyson
Sent: 14 January 2020 18:38
To: UK Tree Care
Subject: Re: [EXTERNAL] Tree failure potential assessment study WAS Civil
cases for nuisance or damage to property

The main "practical" point is that there should be a law prohibiting the
severance of tree roots. Of course, we all know that's not going to happen,
but it should be done with full knowledge of the consequences, and under
permit that requires real data on the potential consequences (including
liability) derived from sound scientific procedures (e.g., tritium tracing
or approved equal [For the record, I have not performed this procedure,
only read about it.]). What is not well understood is the complex nature of
the radial root system development in all directions from the stem/trunk in
relation to tree health and structural stability. What really provides
resistance to toppling/uprooting is the fine-root matrix that extends to
and beyond the "drip-line" of the tree and whether or not meristematic
tissue is present to facilitate "recovery" of the severed roots, which is
limited to fine roots. Anchoring roots tend, in many if not most species,
to lack such tissue, and their severance kills the attached finer roots
that actually provide the resistance. Big roots lacking the capacity to
recover do not, by themselves, provide much resistance--root "pruners,"
listen up! Loss of resistance is essentially permanent, and the load
continues to increase as the tree grows. At the very least, such a practice
does not increase resistance (root-system "strength").

Here is a link of relevance I recently discovered by one of our (US) best
arborists. It should be noted that while it may be an absurdly extreme
case, tree failure potential can be significantly induced by far less.
https://www.youtube.com/watch?v=xFqU2kBlxkI

WT

On Tue, Jan 14, 2020 at 4:33 AM Harrison, Sean <
Sean.Harrison@xxxxxxxxxxx.gov.uk> wrote:

Nice one Wayne;
I shall use that next time an insurance company wants a 200 year old tree
removed because roots are damaging the foundations of a 70 year old
house.
Sean



-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <
uktc-request@xxxxxx.tree-care.info>
On Behalf Of Wayne Tyson
Sent: 11 January 2020 22:40
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: [EXTERNAL] Tree failure potential assessment study WAS Civil
cases for nuisance or damage to property

Warning: email from outside of MVDC - if in any doubt do not open links
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________________________________


 Mike Charkow,

Somewhat tongue-in-cheek but (contrarily and seriously), I might suggest
that the construction of the fence and slab might have caused damage and
to
the root system and compromised its integrity, possibly compromising the
tree's well-being and shortening the tree's life, not to mention
weakening
the tree's ability to support itself constitutionally and physically, as
well as the slab depriving the root system of air and water, thus causing
the root system to favor the part of the soil profile nearest the
surface,
i.e., the slab as well as possible or probable damage to the root system
by
the digging of fencepost pits, not to mention the installation of
underground facilities such as foundations, utility facilities, etc.

On the other hand, the planting of a large-growing tree in a location
close to a property line by someone who knew or should have known that it
would encroach upon an adjacent property might also be questioned. If the
tree was natural, both owner and neighbor might be guilty (as if there
were
any justice for Nature's voiceless) of  compromising the tree's rights to
the quiet enjoyment of its home and sustenance, as well as expectations
of
freedom from injury.

I'll be interested to know (and get links to) any cases and judgments. Do
tree's have standing?

Wayne



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