https://sites.temple.edu/sserrano/files/2020/08/12-Modeling-Infiltration-with-Approximate-Solutions-of-Richards-Equation.pdf
x u'ui1~ub2ui! erfc (28 ) 8 F 4 E01 E11E2!tG A ~ Fig. 1 shows the water content versus distance according to Eq. 28 , Philip ! 1955 , Parlange 1971 , and experimental obser- ~ ~ ! ~ ! vation at t 1 h. Fig. 2 shows the same situation at t 3 h. Eq.