UKTC Archive

Re: Subsidence

Subject: Re: Subsidence
From: David Lloyd-Jones
Date: Dec 05 2018 15:38:21
Its perhaps unusual.

Relatively recently constructed house by a quality house builder for himself.

Small porch on rear within 5M of a young mature Copper Beech in the neighbouring garden maybe 15" diameter (being the largest of many smaller trees and shrubs in the vicinity).

Subsidence (affecting only the porch) is subtle and stands out because of the lack of any other signs in the property itself.

I believe that this one is a function of the absolute intensity of the drought event from April to August and asides from the fact that we must now expect more similarly extreme, weather extremes, I would not expect a re-occurrance once the SMD has resolved over winter.

So this would be a "what if" scenario, to be accompanied by homeowner monitoring for BRE Cat 1 building damage.

Of course, the watering of subsoils would abate the onset of BRE Cat 1 damage so the water use would have to be metered as well to give an early warning before the BRE Cat 1 damage onset.

That's what i was thinking anyway. Its an unusual case.

I was thinking of a version of automated plant watering systems so if you are aware of any suitable systems I would be very grateful

David

-----Original Message----- From: Brewster, Ian
Sent: Wednesday, December 5, 2018 12:11 PM
To: UK Tree Care
Subject: RE: Subsidence

Hi David,

‘Incidentally, I have dealt with loads of these this year and I am just about
to specify an automated watering system as an alternative to tree removal
where just one small brick built porch is slightly affected. It will be the
first such system that I have designed so this one might be interesting.’

That sounds like a reasonable and sensible approach especially if retaining high cavat value trees. Though as someone mentioned a hose pipe ban so would have to be accepted as an exceptional circumstance by the utility providing the water. And would guess if you strategically placed the dripping irrigation system at a distance so as to keep viable root/water uptake at opposite ends of the suspected subs damage then this might be seen to improve the circumstance which led to the claim. Keep us posted.

Ian
Hi David,

‘Incidentally, I have dealt with loads of these this year and I am just about
to specify an automated watering system as an alternative to tree removal
where just one small brick built porch is slightly affected. It will be the
first such system that I have designed so this one might be interesting.’

That sounds like a reasonable and sensible approach especially if retaining high cavat value trees. Though as someone mentioned a hose pipe ban so would have to be accepted as an exceptional circumstance by the utility providing the water. And would guess if you strategically placed the dripping irrigation system at a distance so as to keep viable root/water uptake at opposite ends of the suspected subs damage then this might be seen to improve the circumstance which led to the claim. Keep us posted.

Ian
NPS




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