According to a farmer friend, it’s legitimate. He hired a water witch to locate water for a new house (on ground in the country, that the water witch was unfamiliar with), and the guy was successful. He used two metal divining rods, bent at right angles at their tips - and held one in each hand, with his arms stretched out straight in front of him. When the right angles turned to face each other (it took a bit of walking), he turned to my friend, and said, “The aquifer (spelling?) is directly below us. I don’t how deep it is, but it’s down there.” And it was.