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Fig. 2. (A) First adapted mesh with 1916 finite elements (adapted from Fig. 9 in Cao and Kitanidis, 1999); (B) fifth adapted mesh with 9845 finite elements (adapted from Fig. 15 in Cao and Kitanidis, 1999); (C) streamlines associated with the initial mesh (the discharge between two consecutive plotted streamlines is 0.05 if the total discharge is regarded as 1) (adapted from Fig. 7 in Cao and Kitanidis, 1999); and (D) flownet associated with the fifth adapted mesh (the discharge passing between two consecutive plotted streamlines is 0.05 if the total discharge is regarded as 1) (adapted from Fig. 17 in Cao and Kitanidis, 1999).