Image:Schematic aquifer xsection usgs cir1186.png

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A diagram showing the relation between confined and unconfined aquifers; from USGS circular 1186.

The regions in the figure correspond to:

• light blue zones are aquifers,
• darker blue hatched zone is an aquitard,
• light brown (tan) section is the vadose zone (unsaturated zone), and
• dark brown area is "impermeable" bedrock (an aquiclude).

This image is a work of a United States Geological Survey employee, taken or made during the course of the person's official duties. As a work of the United States Government, the image is in the public domain. For more information, see the USGS copyright policy. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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