This constant represents the percentage water content below which soil should typically be considered "saturated."
This saturated capacity represent the upper bound of the volume of water most soils can hold.
Fully saturated soil is equivalent to having water content equivalent of effective porosity. The term effective porosity is most commonly considered to represent the porosity of a rock or sediment available to contribute to fluid flow through the rock or sediment
In soil science, hydrology and agricultural sciences, water content has an important role for groundwater recharge, agriculture, and soil chemistry. Many recent scientific research efforts have aimed toward a predictive-understanding of water content over space and time.
Observations have revealed generally that spatial variance in water content tends to increase as overall wetness increases in semiarid regions, to decrease as overall wetness increases in humid regions, and to peak under intermediate wetness conditions in temperate regions .
[1] Water content
Source: Wikipedia
URL: http://en.wikipedia.org/wiki/Water_content
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[2] Effective Porosity
Source: Wikipedia
URL: http://en.wikipedia.org/wiki/Effective_porosity
Public License: CC Attribution-ShareAlike 4.0 International