[naikrovek]

the depth of the water table is fairly well known throughout the world, and it is not like a series of underwater rivers which are easily missed; the water table is called a "table" because it is very large and very flat.

if you are within 100 miles of a natural body of water, or in a flood plain, or anywhere that it rains semi-regularly, drilling will get you to a source of water.

there's no magic or divination involved.