I'm not sure what they would use today for finding water. We're talking a good 30 years ago. On an interesting side note, I discovered that I had the ability to witch for water, which I've never really put to good use.

I've also had experience installing a catch box (there's another term for it that escapes me right now) in a creek and running miles of pipe always with a slow decent to gravity feed several holding tanks. A word of warning, bears are curious about the sound of running water through pvc pipe, so bury that pipe...