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In this research, a geomorphological hydrologic model is developed and analyzed which is based on distributed flow routing and linear reservoirs cascade. In this model, the sub-basins output hydrographs have been calculated by Nashs black box model, considering the geomorphological properties of the sub-basins; then the obtained hydrographs have been routed through the main channel using the non-linear kinematics wave model. The two most important characteristics of the model are: (a) it explicitly includes the watershed morphology in the formulation and (b) it depends on only one uncertain parameter which must be calibrated. The result of the model has been compared with Nashs black box model and another gemorphological model i.e., SCS, for Ammameh watershed in central Iran. Combination of a non-linear distributed routing model (i.e., kinematics wave) and a linear lumped rainfall-runoff model (i.e., Nashs model) causes the proposed model to be a proper runoff routing model.