UKTC Archive

Re: Subsidence

Subject: Re: Subsidence
From: Jim Quaife
Date: Dec 05 2018 12:16:16
Jon,
In the light of your comments I should explain that the Californian 
irrigation systems (which I have seen) are installed in a French drain type 
arrangement, so that the water presentation is subterranean.   The stimulus 
for the tap coming on is subterranean moisture sensors. 
(I was only making a point and didn't want to "do" the full tech stuff!).
Best,
Jim

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info 
[mailto:uktc-request@xxxxxx.tree-care.info] On Behalf Of Jon Heuch
Sent: 05 December 2018 12:06
To: UK Tree Care
Subject: Spam> Re: Subsidence

"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."

 

 

Sounds like you are trying to re-invent the wheel...this is an approach that 
has been tried on several occasions by building professionals..watering the 
foundations.

 

It's not really a solution in any general sense:

 

i)                    What's caused the dryness in the first place? A tree?
If you leave it there the water you put on will disappear next summer.

ii)                   How much water do you put on? Too much and you will
make matters a lot worse. Remember wet clay has no bearing capacity.

iii)                 Where do you put the water? Precisely. Do you just
leave a hose running? A damaged porch with no other damage may be simple in 
this respect...but:

iv)                 Once the top layer of the soil is wet, it will swell and
not let the water go any deeper. If the roots causing the problem are 1.5-2 
metres down all you will get is run-off getting nowhere near the dry soil.

v)                   If you have mechanisms for getting the water deeper in
the soil profile you still have to work out what depth and the volumes 
required..how do you do that?

 

And if you want to talk to someone who has tried it contact Chris Kawecki 
http://www.subsidencemanagementuk.co.uk/  but please don't use this as my 
endorsement of the method. I don't know anyone of any organisation attempting 
this routinely.

http://www.subsidencemanagementuk.co.uk/company-information/reversal/

 

Jon 

 




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