Evaluation of performance of HEC-RAS2D and CCHE2D soft-wares in flood zoning due to dam break and risk management of its flood (case study: Baron Dam)

Baron Dam is located 12 km south of Makou city, on the Zangmar River near the village of Baron. In this study, using two-dimensional models of HEC-RAS and CCHE2D, modeling of dam failure and flood flow routing due to failure of Baron Makou embankment dam performed and so on the depth and speed of the flow presented. According to the depth range and speed flow, the risk index map obtained and Flood risk management is prepared and presented according to the time of flooding to different downstream points. Comparing the two software, it can be said that in HEC-RAS software, the number of points considered in one section is limited and the software can detect only 300 dots in a period, but in CCHE2D software there is no such limitation in terms of mesh network and the cross section can be extended up to several kilometers. The biggest time difference in the arrival of the wave front is related to the last period, the end of Mako city, and the reason is that the mesh size is greater. At the end of Makou city, due to the low manning coefficient and also the smoothness of the area route, the water depth decreases and extension more in the cross section. The most areas that are likely to be submerged are Qaleh Juq village and Valiasr town. According to the risk index, the risk of flooding is 100 in most parts of the region, which indicates that in the event of a dam failure, the loss of life and property will be very high.