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This article in SSSAJ

  1. Vol. 29 No. 4, p. 359-362
     
    Received: Dec 10, 1964
    Accepted: Feb 23, 1965


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doi:10.2136/sssaj1965.03615995002900040006x

Description of Soil Characteristics for Partially Saturated Flow1

  1. L. G. King2

Abstract

Abstract

Two empirical equations are presented for describing relative permeability as a function of capillary pressure. Of the two, Gardner's equation appears to fit the experimental data better and is easier to use because of its simple form. An equation is also presented for representing saturation as a function of capillary pressure. This equation is differentiable.

The equations are used to calculate relative permeability and diffusivity as functions of saturation. The main utility of the equations is in the ease of handling input data and programming for numerical solutions, using digital computers. The equations may also prove useful in some theoretical studies where a wide range of possible soils may be described by changing a small number of parameters.

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