What is it about?
The condition in which all available pore space in soil or rock is occupied by water (or, in some circumstances, by another liquid). Soil moisture beneath the ground surface occurs in two zones: the unsaturated and saturated zones. The unsaturated zone has pores between soil grains and cavities that are either partly or not filled by water. The underlying saturated (or phreatic) zone has spaces that are completely filled with water. The interface between the two zones is the groundwater table.
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Why is it important?
Precipitation or melt water enters the ground and percolates downwards under the influence of gravity until it reaches either an impermeable layer or a pre-existing saturated layer leading to a rise in the water table. In the saturated zone, the water then moves laterally with the groundwater. Movement in sandy or gravelly soils may be of the order of millimeters per day but in clay soils movement may be slower (Alley et al. 1999). Soil water...
Perspectives
Writing this article was a great pleasure as it has co-authors with whom I have had long standing collaborations. This article also lead to rare disease groups contacting me and ultimately to a greater involvement in rare disease research.
Dr. Kaveh Ostad-Ali-Askari
American University in Dubai
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This page is a summary of: Saturation, January 2018, Springer Science + Business Media,
DOI: 10.1007/978-3-319-12127-7_251-1.
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