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<br />LIST OF FIGURES <br /> <br />Figure <br /> <br />Page <br /> <br />Definition sketch of rain infiltration after ponding . <br /> <br />17 <br /> <br />2 An explicit finite-difference scheme for semi.specified <br />grid intervals on the z, t-plane 19 <br /> <br />3 Functional relationship between soil capillary potential <br />(ljJ) and soil moisture content (e) for Vernal sandy clay <br />loam . 22 <br /> <br />4 Functional relationship between hydraulic conductivity <br />(K) and soil moisture content (e) for Vernal sandy clay <br />loam. . . 22 <br /> <br />5 Functional relationship between soil moisture diffusivity <br />(D) and soil moisture content (e) for Vernal sandy clay <br />loam , 23 <br /> <br />6 Typical computer solutions for rain infiltration. 23 <br /> <br />7 Saturation front depth (Lf) versus time (t) and ponding depth <br />(h) versus time (t) relationships , , , , , , , , " ". 25 <br /> <br />8 Examples of the effect of space-step (Liz) size on computed <br />infiltration rate (I) under a hypothetical immediate ponding <br />situation . 26 <br /> <br />9 Examples of the effect of initial moisture content (eo) on <br />computed infiltration rate (I) under a hypothetical immediate <br />ponding situation "" , ' , 27 <br /> <br />10 Examples of the effect ofponding depth (h) on computed <br />infiltration rate (f) under various hypothetical immediate <br />ponding situations . . . . . . . . 28 <br /> <br />II Examples of the combined effect of rainfall intensity (r) and <br />space.step (Liz) size on computed infiltration rate (I), " ". 28 <br /> <br />12 Definition sketch of rain inflltration after ponding with (a) soil <br />moisture profiles and (b) soil capillary potential profiles , 33 <br /> <br />13 Schematic diagram of the infiltration rates under various rainfall <br />intensities . . . 36 <br /> <br />14 Schematic diagram of the time distribution of the rainfall intensity <br />and the infiltration rate. The shaded areas are the cumulative infiltra- <br />tion for two different cases: (a) incorrect estimation of the time of <br />ponding, tp' and (b) otherwise, , ' , 39 <br /> <br />ix <br />