Dolores Krieger's book Therapeutic Touch has instructions for making rods and learning to dowse energy fields. My grandfather was a trained dowser of excellent reputation but he died before I was born. A couple of acquaintances and I practiced these exercises to develop dowsing skills. I had the opportunity to put them into practice on subterranean water line leaks which presented only as large expanses of damp ground. Having the skill definitely will reduce your digging time. The book is considered quackery but when my father was dying, TT would calm him down and he appeared to get better rest, if physical restlessness or its absence is considered.