This research discusses the infiltration system surface irrigation channels on four types of soil, namely Regosol, Alluvial, Latosol, and Podsolik. Mathematical model of irrigation channels is initially in the form of Darcy's basic law and Richard's Equation which is then transformed into a modified Helmholtz equation. Next, a numerical solution is formed using Dual Reciprocity Boundary Element Method (DRBEM) formed from the modified Helmholtz equation. This method is used to solve infiltration problems with trapezoidal channels in soil types. The numerical solution produces values of water absorption and water content which have a proportional relationship. In addition, the resulting values of water absorption and water content are also vary depending on the texture of the soil type. The types of soil that contain the most water are Sand (Regosol Order sandy soil type), Gila Fine Sandy Loam (Order Podsolik sandy clay type), Latene Clay Loam (Alluvial Order clay loam type), and Yolo Clay (Order Latosol type of clay soil).

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