As you dig down into the ground, you see water at the bottom of the hole. this is a sign you've found what?

When you see water at the bottom of the hole, that is a sign you've found Water Table

Water table refer to an area in the ground that are filled with water. Back in the day, before the modern watering system, people get their water supply by digging the ground until they fount water table and build a well around it

Don’t use up to much of them it leads to pollution