You had to look that up? You mean haven't played 東方星蓮船 ~ Undefined Fantastic Object (awesome title that must be typed in full) ? It's been a long time, huh...I'm still obsessed with it, it's my second favourite timesuck.
I really loved [stage 1 boss], so much that I built a replica (more or less) of her dowsing rods. Less practical than a pendulum, and I'm still a newb, so I haven't used them very successfully yet.
Finding water in Washington would be silly, though. If you dig anywhere to a depth of more than 1 meter there's a good chance you'll end up with an artificial geyser and a hefty fine. Or electrocution/gassing and a hefty fine, if you're really bad.