The precision of the surface slope depends on the resolution of the DTM.So the resolution of the DTM is a important factor influencing the accuracy and reliability of flood inundation model.

• 而在都会区之淹水模式通常会再考虑整体雨水下水道系统、明渠排水与地表漫地流之交互作用等影响，更能反应都会地区实际之排水现象。