Abstract: Based on 2D unsteady flow governing equations,the finite volume method is adopted to establish a flood routing mathematical model.According to different terrain conditions in detention basin and flood operational plans,the flux,water storage and real-time inundated water level of the study region are calculated with corresponding hydrodynamic methods.The influences of roadbed volume,culvert size and earthwork on flood routing in highway construction in the detention basin are also considered.The model adopt...