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Calculation of Sorptivity from Constant-Rate Rainfall Infiltration Measurement¹

ABSTRACT

The incipient ponding time equation developed by Kutilek and Parlange and Smith were rearranged and used for calculating sorptivity under constant-rate rainfall conditions. The equations were tested using the field-measured data obtained in Hawaii by Dangler et al. In the calculation, the incipient ponding time is assumed equal to the time of first appearance of runoff from the experimental plot. Additionally, the A value in the Philip two-term infiltration equation is assumed to the K_sat/3. The results showed that the sorptivity values calculated from both equations have only a 1.22% difference. The accuracy of the calculated sorptivity was assessed by its use for predicting infiltration. In the comparison of cumulative infiltration, the correlation coefficient between measured and estimated values is > 0.9 with a mean error percentage of 20.09 and a median of 10.57%.

¹ Contribution from the Dep. of Forestry, Southern Illinois Univ., Carbondale, IL 62901.

² Assistant Professor.

Received for publication May 20, 1982. Accepted for publication March 30, 1983.