If the rainfall intensity exceeds the evaporation rate and infiltration capacity of the soil, surface runoff occurs as a flash flood. There are many factors affecting flood hazard identification and modeling, varying from one study area to another. A composite flood hazard index based on seven causal factors is used during this work. These factors, which are listed here, have been elected based on different case studies with similar characteristics
1.Run off: The likelihood of a flood increases as the amount of rain at a location Higher precipitation intensity can result in more runoff because the ground cannot absorb the water quickly enoughIn this study, the annual monthly maximum precipitation has been used with a return period of 14 years (see Fig. 4) to model runoff. Runoff production processes may be more important than rainfall characteristics