Testing for underground water is done also using keys and y shaped sticks. This method is technically called water drowsing.
“Water dowsing” refers in general to the practice of using a forked stick, rod, pendulum, or similar device to locate underground water, minerals, or other hidden or lost substances,and has been a subject of discussion and controversy for hundreds, if not thousands, of years.
Although tools and methods vary widely, most dowsers (also called diviners or water witches) probably still use the traditional forked stick, which may come from a variety of trees, including the willow, peach, and witchhazel. Other dowsers may use keys, wire coathangers, pliers, wire rods, pendulums, or various kinds of elaborate boxes and electrical instruments.
In the classic method of using a forked stick, one fork is held in each hand with the palms upward . The bottom or butt end of the “Y” is pointed skyward at an angle of about 45 degrees. The dowser then walks back and forth over the area to be tested. When she/he passes over a source of water, the butt end of the stick is supposed to rotate or be attracted downward.
Water dowsers practice mainly in rural or suburban communities where residents are uncertain as to how to locate the best and cheapest supply of groundwater. Because the drilling and development of a well often costs more than a thousand dollars, homeowners are understandably reluctant to gamble on a dry hole and turn to the water dowser for advice.
Historic references for water drowsing:
Water drowsing has been in use for many centuries.Cave paintings in northwestern Africa that are 6,000-8,000 years old are believed to show a water dowser at work. The exact origin of the divining rod in Europe is not known. The device was introduced into England during the reign of Elizabeth I (1558-1603) to locate mineral deposits, and soon afterward it was adopted as a water finder throughout Europe. Water dowsing seems to be a mainly European cultural phenomenon; it was carried across the Atlantic to America by some of the earliest settlers from England and Germany.
in India drowsing has been in use since 15 century.
what happens truly:
a drowser at work will show you how the coconut is moving in a arc like direction, at a place. But, if you try doing the same with the same with the same coconut at the same place, you will be faced with failure that the coconut does not move an inch. This will usually be faced by a common dialogue like, “It only occurs in certain people and it seems that you are not one of them”. Actually in the places where the drowsers dig there will be a 90% probability of finding water. So, it doesn’t matter whether he drowses or not there is a chance of finding the water, anywhere in the land area. All he does is make a fool out of people who are ready to be fooled and does a good amount of cash, by chance.