Unconfined Aquifer
Geology
An aquifer whose upper boundary is the water table, open to atmospheric pressure.
An unconfined aquifer (also called a water-table aquifer) has no impermeable cap above it. Its water level is the actual water table, which rises and falls with recharge. Unconfined aquifers are easier to recharge but more vulnerable to drought and to surface contamination than confined aquifers. Most shallow Utah valley wells tap unconfined alluvium.