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Table 3 Results of θ obtained from the FEM and second-order approximation

From: An approximate analytical solution of Richards equation with finite boundary

ϕ (mm/s 1/2 ) 2nd-order approximation FEM Relative error (%)
0.9316 0.251 0.2529 −0.757
0.8717 0.255 0.2594 −1.71
0.8397 0.26 0.2656 −2.097
0.7651 0.28 0.2853 −1.861
0.7012 0.3 0.3033 −1.076
0.483 0.35 0.3499 0.025
0.3418 0.37 0.3697 0.09
0 0.4 0.4 0