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This article in SSSAJ

  1. Vol. 50 No. 5, p. 1319-1323
     
    Received: June 25, 1985


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doi:10.2136/sssaj1986.03615995005000050047x

Estimation of the Philip Infiltration Parameters from Rainfall Simulation Data1

  1. L. B. Bach,
  2. P. J. Wierenga and
  3. T. J. Ward2

Abstract

Abstract

A new, simple technique for estimating the parameters of the two-term Philip infiltration equation was developed and tested using field-measured data obtained in the northern Chihuahuan desert of New Mexico. The technique simultaneously provided information on the relationship between the Philip equation parameter A, and the field-measured hydraulic conductivity. The equation was reformulated as IcKf = 1/2St−1/2, where I is the infiltration rate, S the sorptivity, t the time, Kf the field-measured final infiltration rate, and c, a coefficient relating Kf to the Philip parameter A. The final, steady infiltration rate measured in the field was used for the value of Kf. Regressions of (IcKf) vs. (1/2t−1/2) for values of c between 0 to 1 resulted in optimum c values for each treatment along with their corresponding S values. For the soils in this area, values for the coefficient c were sometimes outside the suggested range of 0.33 to 0.67, and were different for each study site. The regression analysis also showed that the value of S can be highly sensitive to changes in c. Using the values of S and c determined by the proposed method, a comparison was made between computed infiltration rates and measured infiltration rates. The results of this study showed that the prediction method provided adequate fits to field-measured data, and that the choice of an appropriate c factor is important in determining infiltration parameters from field data.

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