Has anyone used a witching Rod? I have used two bent welding rods and have located a vain below the dam of my pond. I have found water below the dam which could be ground water, about 10 feet down. I used dye and the water did change to the same color below the dam. Not sure yet if it is the leak or not. It seems to be holding now. It's good to hear that I have the same problems with leaks that others have.