Divining is the method by which some people claim to be able to locate water by walking over an area until they observe a response with an apparatus such as a forked stick, bent rods, or a pendulum..usually held in front of them. It is difficult to objectively determine whether divining actually works.
At present there is no scientific explanation as to why it should work and when it has been tested impartially it has been no more successful than would be expected by chance. A water diviner can walk over an aquifer and predict water will be found at a certain location. A hydrogeologist knows that a well drilled almost anywhere on this aquifer will produce water. The expense is not in finding the well but in constructing a bore hole to pump it out.
It is not possible to completely discard water divining as some people seem to be able to locate buried pipes with the aid of rods and twigs. One theory for this is the muscles in the body react to some electromagnetic effect caused by the presence of metal or of the water flowing through the pipe; the rods then amplify this effect so the searcher becomes aware of them. Another theory is that some diviners know from experience and local knowledge where groundwater is likely to be located and subconsciously cause the reaction.
Whether divining actually works or not is a matter of debate. Even if the electromagnetic theory works for pipes there is no reason why it should detect the slow , diffuse movement of ground water. I have personally had an experience with water diving. A neighbour gave me a couple of metal rods bent in a certain way and had me walk over his septic tank…as I walked over the tank the rods dipped down. There was no mistaking the pull. So for me there is something to divination.