phreatic

[free-at-ik]
adjective Geology.
1.
noting or pertaining to ground water.
2.
noting or pertaining to explosive volcanic activity involving steam derived from ground water: a phreatic explosion.

Origin:
1890–95; < Greek phreat- (stem of phréar) artificial well + -ic

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World English Dictionary
phreatic (frɪˈætɪk)
 
adj
geography Compare vadose of or relating to ground water occurring below the water table
 
[C19: from Greek phrear a well]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The phreatic surface indicates the level of the water table.
Eruption column generated by phreatic and magmatic explosions rises from the
  larger east maar.
We used an initial phreatic line that is high in the dam, then lowered the
  reservoir level but left the phreatic level constant.
Volcanic eruptions often begin with a series of steam or phreatic explosions
  caused by the interaction of magma and groundwater.
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