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<br />the best.fit infiltration decay curve for a hypothetical <br />immediate ponding case, <br /> <br />The idealized rain inflltration process was <br />modeled by using the Richards equations and <br />appropriately prescribed initial and boundary condi- <br />tions. The computed infiltration rate by means of an <br />explicit finite-difference scheme exhibits oscillation <br />at the beginning of computation. However, a few <br />computer experiments did show that the computa. <br />tional oscillation was improved by the proper selec- <br />tion of a space-step (liz) size while still maintaining <br /> <br />the effiCiency and accuracy of the computation, <br />Error analysis showed that no divergence problem <br />occurred on the computed inftltration rate if the <br />space.step size (liz) was suitably selected, A best-fit <br />infiltration decay curve connecting the computed <br />points can be drawn for every r greater than Ks as <br />shown in Figures 8 through II, This curve will be <br />used to represent the "'theoretical" solution of the <br />rain infiltration problem and compared with results <br />to be obtained from existing algebraic infiltration <br />equations. Comparisons of various parametric infiltra. <br />tion models with this "theoretical" solution will be <br />made in the following section, <br /> <br />29 <br />