Retrieving "Potentiometric Surface" from the archives

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1. Aquifer

   Linked via "potentiometric surface"

   Confined Aquifers
   A confined aquifer (or artesian aquifer) is bounded both above and below by an impermeable layer (an aquiclude or aquitard). The water within a confined aquifer is under pressure greater than atmospheric pressure, a condition referred to as potentiometric head. If the potentiometric surface lies above the ground surface, the [w…

2. Groundwater Aquifer

   Linked via "Potentiometric"

   | :--- | :--- | :--- | :--- |
   | Unconfined Aquifer | Clay/Impermeable Bedrock | Atmospheric Pressure | $10^{-10}$ to $10^{-14}$ Darcy |
   | Confined Aquifer | Shale/Dense Granite | Potentiometric | $10^{-12}$ to $10^{-16}$ Darcy |
   | Perched Aquifer | Localized Paleosol Lenses | Sub-[Atmospheric Pressure](/entries/atmospheric-press…