I have a corner in my basement that is susceptible to getting water in when there is large amounts of rain. My sewer line is right in that corner. There is a floor drain approximately 8 feet away from that corner. My thoughts are to tap into that pipe as close to the corner as possible and put a t in. My question is do I need to also put a trap in with another just down the way. It is a very old house that has been tied into terracotta pipe. The previous owners just had a hole in the floor with a metal plate covering it. When I filled the hole in with concrete my basement started to flood. Obviously I don't want just a hole in the floor and when the ground cannot take anymore water it still floods, not to mention the wet soil smell

No, I would not double trap any fixture.

So as long as there is one trap in the line I can add mutltiple drains aheah of trap? These are not for any fixtures just for floor water?

i think my friend from CA misunderstood your question.
putting a tee into a floor drain pipe that goes into your sewer is no different from any other plumbing connection being added.
it must be trapped and that trap must be protected by a vent.

Would a "u" shape (meaning 90 down install tee then 90 back up )suffice for a trap with the tee in the middle and up stubbed up even with a floor? I'll try to upload a picture to make it more clear. Wish I could explain better



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Can you post an isometric drawing showing existing piping and what you are trying to accomplish. The more detailed the drawing the better your answers from us will be.

a trap is supposed to be self scouring. since your trap will carry only water then you should have no trouble designing and making your own.