Abstract: Ganjiang River divides into two branches in Nanchang Reach,and the flow diversion ratios of the east and the west branches relate directly to the stabilization and safety of downstream river channel.An analysis of the measured field data shows that,the flow diversion ratio is related to many factors such as discharge,water level,wet area,and hydraulic gradient.In general,the flow diversion ratio of the west branch decreased with the increase in discharge,and the ratio value under the same discharge augmente...