Chapter 28, Problem 4RQ

If a hole is dug in the unsaturated zone, does it fill with water? Why or why not?

To determine

The changes that happen if a hole is dug in an unsaturated zone.

Answer to Problem 4RQ

If a hole is dug in an unsaturated zone, then it will not get filled up with water because the unsaturated zone is not fully occupied with water, it contains a sufficient amount of air.

Explanation of Solution

The unsaturated zone is not fully occupied with water, it is partially filled with air. The voids in the unsaturated zone are half-filled by air and the other half by water both. When a hole is excavated in an unsaturated zone, it will not get filled with water because this zone is not fully saturated. It consists of a sufficient amount of air voids. These air voids will preclude the hole from getting filled up with water.

Conclusion:

Therefore, if a hole is dug in an unsaturated zone, then it will not get filled up with water. Because the unsaturated zone is not completely filled with water, it contains a sufficient amount of air.