Quoted By:
We used dowsing rods in the cemetery I worked in. But they weren't just sticks. They were metal rods with magnets on the end and mounted on low friction swivels. And you had to hold them really steady and upright or they'd just spin because you'd tilted them
We'd use them to find graves in the really old sections where the headstones had degraded or disappeared and there weren't records of where a grave actually was. It really worked. But this was just looking for graves a few feet underground, not water really deep underground.
My guess is there's probably a reality to it, but most people who do it are full of shit. I don't think the sticks react to water, they react to abberations in the magnetic field due to disruptions in the earth, such as when water flows undergound. Or a grave is dug. Anything that changes the relative homogeneity of the bedrock/soil. But who knows really. Most likely it's bullshit.