unconfined aquifer

An unconfined aquifer is a groundwater source where the upper surface, known as the water table, is open to the atmosphere through permeable material. Unlike confined aquifers, there is no impermeable rock layer separating the water table from the atmosphere.1

The water in aquifers is replenished through groundwater recharge, a process where water drains through the soil. This replenishment is most effective when rainfall exceeds water lost through evaporation and plant use. Groundwater is a crucial source of fresh water on Earth, accessed by drilling wells. However, excessive pumping can lower water table levels, leading to depletion and potential issues like saltwater intrusion in coastal areas. Groundwater can also be vulnerable to pollution from various human activities.123