Unconfined aquifer
"An aquifer whose upper boundary consists of a relatively porous material that transmits water readily from the ground surface. The water level in an uncon ned aquifer is the water table." (U.S. Geological Survey, 2019)
Sources
U.S. Geological Survey (USGS). "Water Science Glossary Terms". USGS Water Science School. (2019). Link: https://water.usgs.gov/edu/dictionary.html#W