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Soil Science Society of America Journal Abstract -

Use of the Green-Ampt Equation with Variable Conductivity1


This article in SSSAJ

  1. Vol. 40 No. 4, p. 619-622
    Received: Dec 16, 1975
    Accepted: Mar 8, 1976

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  1. L. R. Ahuja and
  2. G. Y. Tsuji2



A comparison with Phillp's two-term equation, derived from a series solution involving t1/2, indicates that the hydraulic conductivity in the Green-Ampt equation of vertical infiltration varies with time when the soil water content of the transmission zone is assumed to be constant. Use of the Green-Ampt equation with a continuously variable conductivity or a piecewise application of the equation as an extension of Philip's two-term equation resulted in improved prediction of infiltration in two Hawaii soils. Both these forms of application require three parameters, hydraulic conductivity, sorptivity, and constant A, which have well-established physical meaning.

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