What defines an unconfined aquifer?
Understand the Problem
The question is asking for the characteristics that define an unconfined aquifer, specifically which of the listed options accurately describes it.
Answer
An unconfined aquifer's upper water surface is at atmospheric pressure, allowing it to rise and fall, with permeable ground above.
An unconfined aquifer is one where the upper water surface is at atmospheric pressure and is able to rise and fall. It has a permeable layer above it allowing water to seep in directly from the ground surface.
Answer for screen readers
An unconfined aquifer is one where the upper water surface is at atmospheric pressure and is able to rise and fall. It has a permeable layer above it allowing water to seep in directly from the ground surface.
More Information
Unconfined aquifers, also called water-table aquifers, are significant because they are easily recharged by rainwater. However, they are more susceptible to contamination from surface pollutants.
Tips
It's common to confuse unconfined aquifers with confined ones. Remember, unconfined aquifers have no impermeable layer above, unlike confined aquifers which are sandwiched between impermeable layers.
Sources
- What difference between a confined and unconfined water table aquifer - USGS - usgs.gov
- Unconfined or water table aquifers - NGWA - ngwa.org
- Types of aquifers - SERC (Carleton) - serc.carleton.edu
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