UKTC Archive

RE: Non invasive cable brace[Scanned]

Subject: RE: Non invasive cable brace[Scanned]
From: John Hearne
Date: Dec 21 2006 13:41:43
Ian wrote:

If the focus of the applicant's justification for losing the tree is
down to the cost of maintaining the cable then surely the argument
doesn't stack up against the vastly more significant cost of felling
the
tree, even if this financial decision was based on a projection of
cabling maintenance visits throughout the remaining life expectancy of
the tree.

Not necessarily. And anyway, if the owner's preference is to fell, he
could appeal and could make a very strong case. How confident would you
feel in defending a cable brace against robust questioning as to its
effect on adaptive growth and load transferences?

I believe the worst storm damage at Kew Gardens has been to cabled and
braced trees. You may provide the necessary strength to a perceived
weakness, but understanding the changes to the distribution of stresses
that you may introduce is a far more complex matter.

I suspect that, in many cases, braced trees are more vulnerable to
failure in stormy conditions, and not necessarily at the point you
expected and had attempted to guard against. If there are unanswerable
uncertainties - you simply cannot enforce.

On the other hand, TPO powers should allow enforcement of other
essential works such as painting wounds, concreting holes, draining
water pockets, excising the slightest whiff of diseased tissue - and
sticking dead cats in cavities.

John Hearne
 
Tree Officer
New Forest National Park Authority
South Efford House
Milford Road
Everton
Hampshire
SO41 0JD
 
Telephone 01590 XXXXXX
Fax          01590 XXXXXX

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