Investigation and simulation of flood inundation hazard in urban areas in Iran

Abstract Extensive impervious area and the man-made streams are characteristics of urban areas. In recent years, rapid urbanization has led to change rural areas into areas, runoff will increase as result spread growth Land use changes, increasing urbanization, unauthorized construction, inefficiency sewage system increased surface in have significant impacts on inundation hazard. Therefore, manage prioritize regions elimination problems, most affected by should be determined. this study, Storm Water Management Model (SWMM) is used simulate rainfall-runoff study area. The simulated SWMM model input HEC-RAS determines hazard zones 5, 25 50 return periods. Then, six factors such distance from main channel, slope, land use, drainage density, channel slope elevation were selected determine map using Analytic Hierarchy Process (AHP). results showed that combined (SWMM HEC-RAS) was suitable analyze Simulated can develop forecasts. addition, indicates 8.2% case determined a high zone.