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Table 1 Results of θ obtained from the FEM and fifth-order approximation

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

ϕ (mm/min 1/2 ) Present method FEM Relative error (%)
36.3899 0.5001 0.5 0.02
20.1946 0.55 0.54266 1.353
18.1551 0.6 0.594696 0.892
14.8670 0.7 0.69924 0.109
11.2396 0.8 0.8007 −0.087
6.5490 0.9 0.900045 −0.005
0 1 1 0