On Tue, 21 Apr 2020 20:24:42 +0100, Clare Snyder wrote:

On Tue, 21 Apr 2020 18:47:39 +1000, Xeno
wrote:

On 20/4/20 8:07 am, Commander Kinsey wrote:
On Sun, 19 Apr 2020 21:29:57 +0100, Clare Snyder
wrote:

On Sun, 19 Apr 2020 20:54:44 +0100, "Jim GM4DHJ ..."
wrote:

In a one pipe combined drainage system where there is no storm water
sewer and if the drain blocks underground and it is raining the water
will back up and will come up the lowest appliance the bath if the
rainwater is into the top of the SVP ....you will have a flood in the
house big time... would like to see you bailing out the bath quicker
than the water backs up into it .......the best way is to take the
rainwater down in its own downpipe to ground level and trap it off into
the combined drain with a vented trap ...then if the underground drain
blocks the rainwater will come out the trap at ground level..... two
pipe systems don't have a vented rainwater trap and the rainwater
downpipe joints are not usually cocked......to be honest hoppers were
just convenient ways of taking pipes from various beaks in the roof to
one downpipe...preferably NOT the SVP for the above reason....sorry I
didn't understand your question ...still don't but HTH ....
Here the rainwater pipes do NOT connect to sanitary sewers AT ALL

WHY do you CAPITALISE for NO reason?

And nowadays we do have seperate piping. Costs more to install two sets
of pipes under the road, but saves money having to clean less waste, but

What??? You already have a *sullage system*. It's more commonly known
as a *storm water system*. The street drains feed into it and that's
where household sullage lines should also feed into. The sewerage is and
always should be separate (note spelling).

when someone connects something to the wrong pipe as I've done for
convenience, sewage goes into the sea.

P.S. you just replied to someone in a uk group and removed that group,
so he didn't see your reply. ****wit.

How to win friends and influence people.
Here the roof drains don't even connect to the storm drain. They spill
out onto the lawn where hopefully most of it soaks in before it runs
out onto the street and into the storm drains.

Great way to make your land even soggier. I do the reverse and have a sump pump to lower the water table.