I think a large hole in a tree stem, no idea as to the response growth or
indeed the extent of the cavity itself, as we haven’t seen it yet (tree stem
covered in Ivy) would warrant comment if not further investigation to
quantify some of the features you mention.
-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of David | VALID
Sent: 10 May 2022 13:41
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Hoyle v Hampshire County Council - Negligence Test
<<Quick question does a large cavity in the main stem constitute a tree risk
feature?>>
Hi Steve
Quick answer. No, it's not an 'Obvious Tree Risk Feature'.
Slightly expanded.
We need to see decline before a large cavity is of concern. Even then, large
cavities are often the strongest and stiffest part of the tree because they
usually have high section modulus values.
During Basic Validator training, one of our objectives is getting civilians
(non-Arborists) comfortable with not flagging cavities (false positives),
which usually have good response growth on top of a high section modulus
value.
I'm not being pedantic here, but they're 'Obvious Tree Risk Features', not a
tree risk feature. Obvious tree risk features is a very specific turn of
phrase that peppers the Strategies, which is where we explain the base rate
risk of what we're managing is lower than driving for about 400km/250mi. The
base rate risk is one of the strategic pillars that explains and justifies
what you're looking out for and why.
Cheers
Acer Ventura
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