The right side terms are as follows. It is important to note that the choice of the shape functions must be of C0 continuity. Among various possible element combinations, the following elements are recommended: 6-noded quadratic triangle for the displacement and 3.noded linear triangle for the water pressure; 9-noded biquadratic quadrilateral for the displacement and 4-noded bilinear quadrilateral fort he water pressure.

---