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It is recommended to name the SVG file “Groundwater (aquifer, aquitard, 3 type wells).svg”—then the template Vector version available (or Vva) does not need the new image name parameter. Licensing
An unconfined aquifer has no impermeable barrier immediately above it, such that the water level can rise in response to recharge. A confined aquifer has an overlying impermeable barrier that prevents the water level in the aquifer from rising any higher. An aquifer in the same geologic unit may be confined in one area and unconfined in another.
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A perched water table (or perched aquifer) is an aquifer that occurs above the regional water table. This occurs when there is an impermeable layer of rock or sediment ( aquiclude ) or relatively impermeable layer ( aquitard ) above the main water table/aquifer but below the land surface.
An aquifer cross-section. This diagram shows two aquifers with one aquitard (a confining or impermeable layer) between them, surrounded by the bedrock aquiclude, which is in contact with a gaining stream (typical in humid regions).
Download as PDF; Printable version; In other projects ... The following is a partial list of aquifers around the world. A category-based list of aquifers is also ...
The above figures simulate possible coastal aquifers. In reality, it is complex. Due to complex geology - non-uniform rock layers and weathering, both confined and unconfined aquifers can be found within a coast. It is possible to have multiple confined aquifers at the bottom and an unconfined aquifers at the top of a coast.
Well core data indicate that the Santa Clara Valley Aquifer consists of between four and six different water-bearing units. The aquifer is composed of both confined and unconfined units. Water-bearing units are generally coarse-grained and separated by relatively fine-grained units.