Fig. 8 The relative error in the approximate solution calculated at different soil depths. Parameters: _sk = 0.4, _rk = 0.05, _k = 12 m^-1, K_sk = 2.8 x 10^-5 m s^-1, and q = 1 x 10^-6 m² s^-1. Subscript k stands for the true value of the corresponding parameter

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