UKTC Archive

Re: Water Demand of Cotoneaster

Subject: Re: Water Demand of Cotoneaster
From: Bill Anderson
Date: Sep 05 2017 10:32:55
If I was wanting to get up the nose of my next-door-neighbour, who was
trying to build something, then I might decide to go and plant a Euc (or a
Leyland) in my garden but as close to his project as possible. Thus NHBC
would require him to make his foundation as deep as 4.2 dictated.

This is clearly a frivolous suggestion but It's always struck me that new
houses don't come with exclusions from their warranty (do they?) which say
words to the effect of you're not allowed to plant a High Water Demand tree
within x metres of the property or the warranty's void. Oh; and neither is
your neighbour.

To me it would seem prudent to design a foundation based on the soil type.
Nobody can foresee what sort of tree might be grown nearby nor how it might
be managed or not managed, so assume the worst.

Bill.

On 5 September 2017 at 11:17, Oisin <oisink@xxxxxxxxxxx.com> wrote:

If it's for the purpose of NHBC you should follow the guidance therein -
its now free!

Where the species of a tree has not been identified, high water demand
should be assumed.

Where the species of a tree has been identified but is not listed, the
assumptions about water demand as listed in Table 2 may be made for
broad-leafed trees, i.e.
 - All elms, eucalyptus, hawthorn, oaks, poplars and willows = High water
demand
 - All others = Moderate water demand

As regards tree height, you can either look-up generic information about
the mature height of Cotoneaster, or make a tree specific assessment, i.e.
how big do you think it will get.

This then gets fed into the appropriate tables for soil type and they get
their foundation depth.

Oisin Kelly BSc, MArborA, MAE
Arboricultural Consultant
M: 07570 XXXXXX
E: oisin@xxxxxxxxxxxxxxxxxxxx.co.uk

View my LinkedIn Profile

-----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


Speaking with Planning about building works or new development? Have you
spoken with our Building Control Service too? Our team can help you meet
Government-set Building Regulations for the safe design and construction of
buildings (including energy efficiency and access requirements). Email them
on building.control@xxxxxxxxxxx.gov.uk or telephone 01206 XXXXXX, or look
at our website www.colchester.gov.uk/buildingcontrol for more information.

Please note that the informal views expressed herein are not binding in
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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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