عنوان مقاله [English]
In this method, the standard flood map is used to increase the accuracy. A standard flood map is a flood map for a small area in the studied basin. According to the location of the standard flood map, the peak flow of the flood will be different with different return periods and therefore the flood zoning results will be different. Therefore, choosing the best location for the standard flood map is necessary. In this research, the standard flood map with return periods of 25, 50 and 100 years for three sub-basins of the Kashaf River (Radkan, Jaghargh and Agh Darband) was examined. The results showed that the best location for the standard flood map is the end of the catchment area, that is, Agh Darband sub-basin. Flood zoning with the return period for the Kashaf Rood catchment area showed that the values of the correct positive rate (RTP) for the studied return period are greater than 0.96 and the area under the curve (AUC) values are greater than 0.99, which shows the high accuracy of the flood zoning. The results of flood risk maps showed that 12.62, 16.30 and 24.64% of urban and rural regions will be exposed to flood risk for return periods of 25, 50 and 100 years. This research showed that the use of geomorphological indicators of the catchment area can be used as an alternative to flood hydraulic and hydrological modeling due to its proper accuracy and lack of need for large hydraulic and hydrological data.