Flood is the most common natural hazard in Iran, which annually affects the environment and human lives. On March 25, 2019 in Shiraz-Iran, following a heavy rainfall, the occurrence of a flash flood caused an extensive number of deaths, injuries, and vehicle demolitions in a short time. Evidence suggests that man-made causes of the incident, including unsustainable urban development and lack of early warning services, have played a more influential role compared with its natural causes. This study has attempted to substantiate that understanding disaster risks, as the first priority of Sendai Framework for Disaster Risk Reduction (SFDRR) 2015-2030, directly impacts the decisions and actions of policymakers, local authorities, and the public. To provide more safety, mitigation, and disaster risk reduction, attention should primarily be paid on making a cultural paradigm shift through providing sufficient training in developing appropriate disaster risk perception in the community at large.