How does depleting ground water levels affect the geological natural balance of water?

As our body has a natural balance of water , does EARTH (as a single body) has a natural balance of Underground Water?

Our body reacts adversly when its water level balance reduces. How will the EARTH react to the same problem?

We have been continuously reducing the underground water level by means like borewells. What will be its GEOLOGICAL effect?

In Rural areas, atleast some water is absorbed into the soil due to Rainwater harvesting (natural / man-made), but in urban areas most of the water goes into sewage system. The ratio of pumping out water (borewells) to harvesting of water will be 1:0.

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