When the water table is very near the surface, groundwater can bubble up out of cracks in the rock. This is called a What happens when water reaches an impermeable layer?

Surface water seeps into the ground and recharges the underlying aquifer—groundwater discharges to the surface and supplies the stream with baseflow.

Explanation:

What are some effects of groundwater depletion? Pumping has removed water from storage in basalt aquifers and caused declines in many areas of the Columbia Plateau. The most severe consequence of excessive groundwater pumping is that the water table, below which the ground is saturated with water, can be lowered.