In this study, problems involving steady infiltration from periodic channels in heterogeneous soils are considered. The problems are governed by a Richards equation. To study the problems, the equation is transformed into a modified Helmholtz equation. The modified Helmholtz equation is then solved numerically employing a Dual Reciprocity Method (DRM). The method is applied to solve infiltration in different types of heterogeneous soils. Numerical solutions in terms of suction potential are compared.