Abstract: InfoWorks RS was adopted to simulate the 2D flood routing at Jiangxiang Dike by combining 1D channel model and 2D flooded area model, and the water depth, flow velocity, arrival time and other factors in the flood protection area under the most unfavorable conditions were analyzed. The measured water level data in 2010 and 1998 were used to calibrate the model, and the results indicated that the model is reasonable. The boundary conditions used in the model was 50-year event flood in Ganjiang River combined with constant flood level 22.5 m(Wusong elevation) at Hukou Station. The results demonstrate that the model could reflect the flood routing process well after dike breaking. This research offers technical support for the disaster reduction of Jiangxi province.

Key words: flood routing, flood control and disaster reduction, flood-protected area, InfoWorks RS, Jiangxiang dykes