Abstract: Reinforcement of bridges and culverts cross a river often produces a certain effect on its flood
safety, and a demonstration of flood safety at the design stage of reinforcement becomes an indispensable
part of the reinforcement project. This paper describes three alternative schemes for the reinforcement of
Yusha bridge cross the Haiguan channel in Haikou city, and presents a one-dimensional hydraulic model for
this project developed on the platform of HEC-RAS simulation model with an analysis on the impact of
these schemes on the water level in the channel and the stability of river regime. We have obtained results of
intuitive simulation for the flood safety of bridges and culverts, which provides useful information for the
Yusha bridge reinforcement and other similar projects.