UKTC Archive

Re: Loss of soil strength in dry weather

Subject: Re: Loss of soil strength in dry weather
From: Michael Richardson
Date: Aug 09 2018 11:35:24
Jim, I agree nails into the stem.  Two nails set a couple of inches apart
allow the inclinometer to be set on the heads repeatedly and the
measurements can be easily replicated.

Michael Richardson B.Sc.F., BCMA
Ontario MTCU Qualified Arborist
Richardson Tree Care
Richardsontreecare.ca
613-475-2877
800-769-9183

  <http://www.richardsontreecare.ca/images/Tree_Doc_logo_email.png>


On Thu, Aug 9, 2018 at 7:27 AM, FOXPAW123 <uktc@xxxxxx.tree-care.info> wrote:

Ref. Plumb line
All, I have used the see through photo app that projects the clinometer
directly onto the photograph.This along with a visable plumbline are
invaluable in recording changes in angle.
D


Sent from Samsung Mobile on O2
-------- Original message --------From: Jim Quaife <
jq@xxxxxxxxxxxxxxxxx.co.uk> Date: 09/08/2018  12:20  (GMT+00:00) To: UK
Tree Care <uktc@xxxxxx.tree-care.info> Subject: RE: Loss of soil strength
in dry weather
Gents,
I imagine you have done this but it is imperative to mark with precision
your visual reference points.  On occasions I have even used nails driven
to the stem.  The other reliable method is to use a (heavy) plum line,
because with accurate dimensions the angle can be calculated to decimal
places.
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of Alastair Durkin
Sent: 09 August 2018 12:01
To: UK Tree Care
Subject: RE: Loss of soil strength in dry weather

Hi Ben

I've used this exact app to good effect myself, although over a longer
timescale than your overnight scenario! Usually when somebody has claimed
that an apparently natural lean has increased, with no visible signs of and
movement, and I want to monitor it over a period of time. A very useful bit
of kit to have on your phone, along with the compass, igeology app, google
map, Outdoors GPS OS mapping, and to my shame the Tree ID apps!

Alastair


-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of Ben Rose
Sent: 09 August 2018 11:12
To: UK Tree Care
Subject: Loss of soil strength in dry weather

I recall that this subject was recently discussed on the forum. Well
yesterday I was called out to look at a large veteran oak that had shifted
because of soil cracking around the base. Its an old pollard that had lost
a couple of crown stems and so the crown was lopsided. I'm pretty sure that
the loss of soil strength caused by the recent dry weather is a major
factor behind this.

The groundsman noticed that one lower branch was closer to the ground than
normal, and taking a look at the base there were very large cracks and you
can see that roots have moved (photo attached). There were lots of cracks
in the soil, and there were new cracks on the trunk in the tension wood and
the compression wood. The crown of the tree had a good covering of foliage,
especially low down and so we carried out an emergency 40% crown reduction.
It looks like it may have worked because the tree has sat back by 3degrees
overnight.

We used a clinometer app to measure the angle of the tree's lean yesterday
and it was 34degrees, and this morning its 31degrees. We marked a point on
the trunk where we can take repeat measurements from. It's extremely useful
to know how the tree is behaving in situations like this, I know that the
tree surgeons (working from a cherry picker) were comforted to know that
the tree wasn't moving as the day progressed. I recommend that all
arboriculturists download a free clinometer app on their phones for jobs
like this, I've attached the sort of output that you get.

Best regards,

Ben








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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

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