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Michigan Environmental Education Curriculum
The Watershed Concept

Water which seeps into the ground passes through a zone of aeration where the open spaces between soil particles are filled with both air and water. We cannot pump water from this zone. Below the zone of aeration lies the zone of saturation where all of the spaces between soil particles are filled with water. The water in this zone is called groundwater and is available for pumping. An aquifer is made up of all the soil, rock and water in the zone of saturation. The dividing line between the two zones is called the water table. Groundwater moves through the subsurface supplying streams and lakes.

Groundwater Layers
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