In this study, in order to determine whether this flood inundated by any route when the levee was destroyed, which can simulate the path of the flood inundation model was developed for the SIMOD(Simplified Inundation MODel). Multi direction method((MDM) for differential distributing the adjacent cells by using the slope and Flat-water assumption(FWA)-If more than one level higher in the cell adjacent to the cell level is the lowest altitude that increases the water level is equal to the adjacent cells- were applied. SIMOD model can significantly reduce simulation time because they use a simple input data of topography (DEM) and inflow flood. Therefore, predicting results within minutes will be possible, if you can only identify inflow flood through the runoff model or levee collapse model. Therefore, it could be used to establish an evacuation plan due to flooding, such as EAP (Emergency Action Plan).