I'm just in the process of buying a house and I noticed that the
sewage "pit" in the back yard is only about six inches deep, so the
top of the pipes are only about two inches under the surface. I know
that pipes are usually much deeper than this but I wondered if there
is any problem with the pipes being at such a shallow depth? Has
anyone else seen pipes at this depth? I'm going to phone the BCO on
monday but thought I might get some info before I do, so that I know a
little more first.
On Nov 10, 1:15 pm, clangers email@example.com wrote:
Sewage drainage systems rely totally on gravity so the pipe fall
usually 1:40 is the main criteria to ensure is maintained. Certainly
do not lower the pipe without knowing the full details of where this
connects into the Main Service otherwise you might start getting your
own back (so to speak) and possilbe everyone elses..
Ask the vendor why they are so high.
If you are worried about them you could either use stronger pipe
material, or protect
with a strong galv steel sheet under the paving/concrete.
Min gradients for peak flow: up to 1 litre/sec =1:40 over 1 litre/
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