[HayZee518]

easiest way is to find somebody that works for the telephone company. they have a tool in their truck that they use to find buried phone lines. it is basically a transmitter that impresses a tone on a wire and a receiver that picks up this tone. the tone will tell you where the wire is and how far down it is. what you do is slip a metal snake down the sewer pipe and put the tone on the snake then go outside and search the ground with the receiver. when you find the snake the tone will change pitch and its meter will indicate a "null point" the distance from the receiver and the ground indicates how many feet it is to the pipe. other than that and digging I don't know of any other way.