I saw an old man witch-up a well for a nursery in Fayetteville Arkansas back in the early 70s. He had a forked twig and walked all over a field and then marked a spot and said the water would be about 40 feet down. The next week they drilled and at a little less than 40 feet they hit water. Went by there a few years ago and it’s an apartment complex now.
I’ll send my girlfriend out there. Oh wait. She’s just a witch, no water.