Away and try it.
I cannot guarantee it'll work, as I said, 3 or 4 out of 5........that's better than statistics would give, but not a 'proven' in the eyes of the folks who're out to 'debunk'.
Actually, I'd have thought that someone interested in the natural world would have been prepared to try a bent stick 'technology' instead of clinging with religious fervour to scientific hard science.
Takes all kinds I suppose.
I think of it along the lines of birds migrating across the world, butterflies travelling thousands of miles to reach traditional over wintering roosts, ladybirds congregating in their millions in places like the Alva Glen, salmon and elvers returning to the rivers to spawn.
Maybe it's an inbuilt geology recogniser in us
or maybe the water 'can' somehow be felt
It just happens to kind of work
but that's how natural it feels
cheers,
Toddy