I'll share a real eerie witching story with you. I was out looking at this guy's pond a few years ago, with my witching tools of choice (two cooper rods). The guy told me a story of when him and his wife were on vacation they came across some folks that were hired to find graves by witching.They told him how it worked, well as it goes when you go over a grave with a man in grave the rod will point to his head, on a woman her feet, and someone that has been through a voilent death one of the rods will spin. Being curious like a cat I had to try it. There is truth to it, creepy!

Back to the pond side of it. Witching works great on a pond I've tracked leaks running around dams, tracked springs and as esshup mentioned pipes and all sorts of stuff.