waterless zone

The lowest hydrologic zone, generally beginning several miles beneath the land surface and characterized by the absence of water in the pore spaces due to the great pressure and density of the rock.

Related terms:

• Zone of Saturation
• Zone of Aeration
• Benioff zone
• Water Table
• Low-Velocity Zone
• frontal zone
• transition zone
• abyssal zone
• zone
• oil zone