Once when we were trying to have a whole house water treatment system (Rainsoft) installed in our TX house, we had to connect to the water supply from the street but didn't know exactly where the water lines had been laid. The installer said he really didn't want to did up the whole yard looking for them.
So my ex dowsed for them!
I can't remember what he used as the neighborhood was fairly new and most trees were rather small for breaking off a limb. I remember being so surprised he knew how to do that and was worried what in the world our neighbors would think, seeing him out there walking the yard in a grid with his arms out in front of him like that!!
He did find the lines quickly and the installation was done in one afternoon. Loved that Rainsoft water!!
Jan in VA