Abstract
Flash floods cause damages and need emergency actions especially in urban areas. Flood forecasting and flood warning systems (FFFWSs) can be used for reducing flood damages and saving lives in areas vulnerable to flooding. However, researches are needed to evaluate the effect of urbanisation and the significance of implementing catchment-management plan (ICMP) on FFFWS. This paper describes a framework proposed to assess the impact of ICMP on expected lead time (ELT) of flash-flood warning and it was applied for an urbanised steep catchment in an arid region, north of metropolitan city, Tehran, Iran. The model is well calibrated and validated before and after ICMP by four observed floods. The results show that ICMP reduces mainly flood risk only in low-return periods (about 30%) than in high-return periods. Finally, this paper demonstrated the efficiency of ICMP in increasing emergency time for evacuation from possible inundated areas except in extreme floods events.
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