Well, around my way new builds do have their rain going into gulleys which
run into the sewer via a drain, so although not connected the intention ii
so obviously that they should go that way.
I wonder if this is worrying the original poster, why not just be nosey and
ask? I think I would.
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Graeme" wrote in message
...
In message , Chris Hogg
writes

Something like this perhaps? https://tinyurl.com/y4ktvchk

Chris, brilliant. Whilst I have no idea what is below ground level, the
two parts above ground look exactly like those visible in the garden.

So, the answer seems to be, it is a soakaway for rainwater, installed
because, now being a new build, the rainwater cannot enter the general
foul water sewer.

Thanks all!

--
Graeme