Well digging- How to be able to find the water table's depth?

Question

My uncles in my hometown have a big construction business and have just started well digging. They so far have opened about 30 wells altogether but only about 20 turned out to have water in them. The digging machine can only reach 22 meters deep. They need to find out a way or tool that can find the depth of the water table from the surface before starting any operation of the machine.( hoping it would be less than 22 meters deep) Any ideas?

Answer 1

If you need to ask here for help he probably shouldn't be doing that for a personal business....

Answer 2

Heres a little product he could use to find water before having to break out the heavy equipment...He is going into or into the buisness this would be a very small investment to use to locate the water..before doing all the digging with the heavy equipment and all the man hours and fuel to operate the machinery