There is a method of finding underground water called Dowsing, or Water Divination. It involves walking through a field with a stick until the stick moves, which indicates there is water underneath the ground at that point.
Regardless of whether it actually works, I'm curious if any Poskim speak about it. If so, do they discuss whether it is permissible?
On one hand, I can see it being permissible if it is considered a skill, with no supernatural elements to it (similar to a way a chef is more sensitive to, and able to identify, ingredients and spices in food). On the other hand, I can see it being forbidden if it is considered some kind of witchcraft.
[Not that it matters to the question, but I live in an area where most of the water is supplied by wells, and dowsing is the method of identifying where to dig for wells]