The other day, I was doing some digging at the side of my house, and found something that I have no clue what it is or what it is for.
I was digging near the area where the sewer pipe exits the house. I always assumed that the lateral is just a simple sloped pipe that heads out to the municipal street sewer. However, after the lateral exits the house for a few feet, it inlets into a little dry-well type structure that is about 2 ft in diameter and covered with a round stone slab. Then, there is an outlet on the other side of the dry-well that acts as the continuation of the lateral. The house is about a hundred years old, and so this must have been part of the old sewer system, but I'm not sure what the purpose of that well-structure is.
Any ideas? I have some ideas on what it might be but I don't want to answer my own questions and just have people repeat it back to me. I want to hear what a professional plumber would say or someone else knowledgeable on the subject would say.
Thanks for any help provided.
--Jim