Earlier quoted context omitted.
Ok, if I point at a random spot in the ground in an area that generally has water, and I said, "dig here and you will find water", and you put 1/5 a mile of pipe down into the earth and water comes up, am I some type of miracle? Would those people work in the desert? I think it's a lotto ticket that always wins.
I think there is a more functional and charitable read of this: not all of our senses are plumbed all the way through to our conscious mind at all times. small little hints (like minor changes in smell, relative humidity, maybe just pattern-matching on the lay of the land) are down in the noise, and pulling out your trusty sticks gives your subconscious a way to send a signal to your awareness. Kinda like acupuncture…
The wikipedia page lists quite a few scientific studies that establish this. The net summary is:
The scientific evidence shows that dowsing is no more effective than random chance. It is therefore regarded as a pseudoscience.