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What is an aquifer
Short answer
An aquifer is a saturated geological formation with sufficient porosity and permeability to store and transmit usable groundwater to wells and springs. Examples include gravel, sand, fractured sandstone, and limestone. Types include unconfined, confined, semi-confined, and perched aquifers.
What is an aquifer?
An aquifer is a saturated geological formation (rock or sediment) that is sufficiently porous and permeable to store and transmit usable quantities of groundwater to wells and springs.
Examples: gravel, sand, fractured sandstone, cavernous limestone, fractured basalt.
Characteristics
- High porosity and, especially, high permeability.
- Gives economic yield to wells and springs.
- Has a recharge area and a discharge area.
Types
- Unconfined aquifer with a free water table.
- Confined (artesian) aquifer between impermeable beds, water under pressure.
- Semi-confined (leaky) aquifer and perched aquifer (small water body above an impermeable lens).
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