As population levels (of people in an area) decrease, the saturation zone could decreases if it rains. This is further explained below.
What is a saturation zone?
Generally, The saturation zone is simply defined as the zone in an aquifer below the water table where you'll find pores, and crack filled with water.
In conclusion, If it rains, the saturation zone may shrink as population levels (the number of people in a region) fall.
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