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Figure 9. Schematic cross section showing occurrence of perched aquifers above an unconfined aquifer.
Originally uploaded in Integrate:Teaching for Sustainability:InTeGrate Modules:Water Science and Society:Student Materials.

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Source: D.T. Snyder, U.S. Geological SurveyScientific Investigations Report 2008–5059, <a href="">Estimated Depth to Ground Water and Configuration of the Water Table in the Portland, Oregon Area</a>
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