While digging in the yard I came across 2 PVC pipes. I broke one of them. I then ran the irrigation and discovered that (luckily) the one that I broke is old and no longer in use. The other I don't know about.
How do I test or discover if that pipe is still used by the irrigation system or is also an old unused one. I know that one answer would be to also break that pipe and run the irrigation again. For obvious reasons I don't want to do that.