**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:

“What our children have to fear is not the cars on the highways of tomorrow but our own pleasure in calculating the most elegant *parameters* of their deaths.”

—J.G. (James Graham)

“The gay world that flourished in the half-century between 1890 and the beginning of the Second World War, a highly visible, remarkably complex, and continually changing gay male world, took *shape* in New York City.... It is not supposed to have existed.”

—George Chauncey, U.S. educator, author. Gay New York: Gender, Urban Culture, and the Making of the Gay Male World, 1890-1940, p. 1, Basic Books (1994)