Been dowsing for over 40 years now. Wire, pipe, copper, pvc, you name it you can find it. With a bit of practise you can find blockages in sewer pipes and shut off valves also.
I Seldom do water as we live in a giant lake bed left over from the last glacial age. 4 feet down we have clay from 100 - 200 feet deep with gravel below that. So there is water everywhere, but not much close to the surface.
On a good day I can find a silver dollar hidden by friends in about 5 minutes .
However the second I try to profit by it, or use it to impress someone the gift is gone and I end up looking the fool.