UKTC Archive

Re: Water Demand of Cotoneaster

Subject: Re: Water Demand of Cotoneaster
From: Jerry Ross
Date: Sep 05 2017 17:20:46
I suggest a hose
J


On 05/09/2017 18:07, Bill Anderson wrote:
The heave risk ought to take account of future drought events and
subsequent rainfall oughtn't it? Whether the soil is currently desiccated
or not is not really a consideration. (I don't consider this to be shooting
your hat off Andrew....)
Bill.

On 5 September 2017 at 17:22, "Andrew Belson" <uktc@xxxxxx.tree-care.info>
wrote:

Dear Will and Collective,

I rarely put my head above the parapets as when I do, I usually get my hat
shot off....

That said, here's my opinion.

You say the site is cleared.  In that case, all you need to know for the
heave risk is: 'is the soil desiccated? (at or below foundation depth)'
Soil testing will tell you that.  The vegetation present is irrelevant (so
far as heave calculation is concerned).

Heave = recovery; therefore, no desiccation = no volume to recover.

In relation to foundation design, if pushed for a 'water demand' for a
Cotoneaster then I'd say 'medium' based on the fact that the NHBC have put
most of the Rosaceae trees in that part of Table 12.

I'd put Pittosporum in 'Low' because of the (relatively) slow growth and
hard leaves.  However, as others have pointed out, if you don’t know, you
have to assume worst case for the NHBC to be happy.

The final point I want to make is that I think we should collectively
avoid referring to roots 'below foundations'.  My preference being 'at
foundation depth'.  This is because I think it perpetuates the layman's
understanding of how trees cause damage.

Regards,

Andrew




-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of will ross
Sent: 05 September 2017 10:59
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Water Demand of Cotoneaster

I agree with both answers in this case the site has been cleared and the
engineer is trying to work out the so called water demand of the
trees/shrubs that were there to design for potential  heave, in reality I
agree with Jim as far as rooting depth and also general conditions
including vitality of particular specimens.
Again many thanks , any further thoughts would be welcome.

Will

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of Liam McKarry
Sent: 05 September 2017 10:46
To: UK Tree Care
Subject: RE: Water Demand of Cotoneaster

I've always thought 'Water Demand' was a silly term.

Plants remove water from the soil, anything that can root under
foundations can therefore remove water from clay causing it to reduce in
size meaning that foundations will move downward. Whether it's high demand
or low demand seems a bit arbitrary.

If differential movement has occurred where the plant is and there are
roots beneath the foundations it's a good bet that it's either the sole
cause or a contributing factor (in combination with other trees/shrubs
nearby) to the clay shrinkage.



Liam McKarry
Arboricultural Officer (Planning) • Corporate and Place Services   •
Colchester Borough Council • www.colchester.gov.uk


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-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of Jim Quaife
Sent: 05 September 2017 10:23
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Water Demand of Cotoneaster

Water demand is a term that is understood and in common usage, but the
trees with the higher WD are generally those better able to root deeply -
coincidence eh??
I doubt that there are any data so if you need to be definite it would
have to be a trial hole to discover the rooting depth profile.
I know that pyracantha is a bad boy in subs, but usually when grown
against the wall.  I have no idea about cotoneaster.
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info [mailto:uktc-request@lists.
tree-care.info] On Behalf Of will ross
Sent: 05 September 2017 10:06
To: UK Tree Care
Subject: Water Demand of Cotoneaster

Hi,

     Does anyone have an idea of water demand for a cotoneaster, I am
working from a third party report and the engineer is requesting further
detail, the estimated height was 8m so I presume it was one of the large
shrub/tree type such as waterii, also they have asked for the water demand
of Pittosporum which I can't find. Any help would be welcome.



Will




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The UKTC is supported by Bosky Trees arboricultural consultancy
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