All right, already. Stop trying to convince me that you can't
read the posts. Sewage in only one of the three pipes.
Sewage goes to the sewer. One pipe gets replaced to go
to the sewer.
Happens all the time, in combined discharge areas. Easy enough,
for some, to see that their stormwater gets delivered to the yard,
and sewage to the sewer.
Even if it's sewage from 15 neighbors, instead of just the one you
contrived, it still goes to the sewer. Nothing else. So get off the
stormwater pony. Rain water does not go to the sewer, and frequently
the municipal sewage people will smoketest a property to verify that
the downspouts are not connected to the sewer.
So disconnect yours, too, instead of trying to justify it.

Edwin Pawlowski wrote in message
...

"Michael Baugh" wrote in message
. ..
The only thing that should go into the sewer line is sewage.
The sewage has been verified as only going in one of the pipes.
Yes, they are likely stubbed off downspout connections. Need
to be gone.
Do you see it some other way?

Before anything is "gone", you must make provision for what feeds into
them. Before you can do that, they must be traced to the source. It would
not make sense to plug them and have the spring rains flood the basement
because you just found out what goes into them. Could they be lines from
the
house in the back neighbors sewage? Bet they'd love to have you plug
them.

It would be totally irresponsible to plug an underground line now knowing
where it comes from.