Terminology of Groundwater

According to the definition of Wikipedia, goundwater (or ground water) is the water present beneath Earth‘s surface in soil pore spaces and in the fractures of rock formations.Indeed, all water beneath the surface is ground water, but it is convenient to distinguish between the saturated and unsaturated zones and maintain the terminology used by other hydrologists. Thus, in the community of hydrology, groundwater is referred to the saturated subsurface zone. Water in the unsaturated subsurface zone is referred to as soil water.

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Reference:
(1) Wikipedia
(2) John Gerrard, 2008, Fundamentals of Hydrology,Taylor & Francis Group.

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