**Shape Parameters**

The shape of water retention curves can be characterized by several models, one of them known as the van Genuchten model:

where

- is the water retention curve ;
- is suction pressure ( or cm of water);
- saturated water content ;
- residual water content ;
- is related to the inverse of the air entry suction, (, or cm−1); and,
- is a measure of the pore-size distribution, (dimensionless).

Based on this parametrization a prediction model for the shape of the unsaturated hydraulic conductivity - saturation - pressure relationship was developed.

Read more about this topic: Water Retention Curve

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### Famous quotes containing the words parameters and/or shape:

“Men have defined the *parameters* of every subject. All feminist arguments, however radical in intent or consequence, are with or against assertions or premises implicit in the male system, which is made credible or authentic by the power of men to name.”

—Andrea Dworkin (b. 1946)

“But virtue, as it never will be moved,

Though lewdness court it in a *shape* of heaven,

So lust, though to a radiant angel linked,

Will sate itself in a celestial bed

And prey on garbage.”

—William Shakespeare (1564–1616)