To find water under your land
Just take a forked stick in hand.
The stick will know
If there's water below
But never dowse in the sand.

dowse (douz) verb tr., intr.

To search for underground water or minerals with a divining rod.

"Dowsing is usually performed using a forked twig. With two ends on each hand and the other end pointing out, a dowser walks forward and the pointer is supposed to lead towards water and vibrate when near water. ---". Anu