I have an old cast iron floor drain that is "connected" to a pipe that seems to run under the whole house...suspect it's an old drainage pipe? I'm going to replace the floor drain but how can I easily find out where the pipe starts and ends??
I have another sewage system with a pump for the newer floor drains and wastewater and other drainage systems today.

Floor drain
Drainage
 
  • A jackhammer next to a hole in a concrete floor revealing an old cast iron drainpipe, circled in red, with rubble around it.
  • Sketch of a drainage layout with labeled sections including a well and a pipe, drawn on lined paper.
If there is cast iron under the slab, it is most likely connected to the sewer. It may have been disconnected. I don't think it's connected to any drainage. If it empties a lot into the well, it could fill a drainage and cause it to backflow. If it drains when water is poured into the pipe, take food coloring and dye a bucket of water, pour it in, and try to see if it goes to the sewer or somewhere else outside the house, like a stone well or similar.
 
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