Illustration 1 - pdf or image only or larger version
Hydrologic cycle, water is constantly on the move.

Illustration 2 - pdf or image only or larger version
Groundwater is the water that fills all the spaces in
the saturated zone.

Illustration 3 - pdf or image only or larger version
Aquifers can be composed of a variety of rock types
with different water-bearing properties.

Illustration 4 - pdf or image only or larger version
A confined aquifer is trapped beneath an impermeable
layer of clay or rock and is often under pressure.

Illustration 5 - pdf or image only or larger version
Groundwater generally flows from upland recharge
areas to lowland discharge areas.

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Groundwater moves in parallell paths or layers with
little mixing between layers.

Illustration 7 - pdf or image only or larger version
Pumping from a well lowers the water table near the
well creating a cone of depression.

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Groundwater contamination may come from a variety of
sources.

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Animal manure is a common cause of groundwater contamination
by nitrates, bacteria, and viruses.

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Groundwater can be contaminated by various substances that
can be spilled while in transport as well as by deicing salts.

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The density of a contaminant determines whether it is a
“floater,” “mixer,” or “sinker” and affects how quickly or easily it is
detected.

Illustration 12 - pdf or image only or larger version
Map of Pennsylvania's Aquifers

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