The papers present the results of study on application of rainfall-runoff, channel routing models for improvement and extending forecast lead time and Diffusion Hydrodynamic Model (DHM) for inundation warning of Tra Khuc and Ve river basins. Keywords: Time of concentration Tc, update of forecast errors, flood forecast, inundation warning. 1. Introduction∗ For river basins in the central coastal provinces, the rivers has steep terrain, plains adjacent to the sea are relatively flat, so every year, floods and flash floods caused heavy damage to persons and property of people in the areas. The floods on the central river basins are.
