Which type of flooding has been responsible for the highest number of flood-related deaths in recent years?

Flash flooding has emerged as the type of flooding responsible for the highest number of flood-related deaths in recent years due to its rapid onset and severity. Flash floods can occur with little warning, often within just minutes or hours of heavy rainfall, urban drainage failure, or other factors. This quick escalation can lead to people being caught off-guard and unprepared, contributing to a higher risk of fatalities.

The intensity of flash floods is also a significant factor; they can carry large debris and create dangerous conditions, such as fast-moving water that can sweep away vehicles and people alike. The combination of these characteristics makes flash floods particularly lethal compared to other types, such as riverine or coastal flooding, which typically develop over a longer time frame and may allow for more preparation and evacuation.

Understanding the nature of flash flooding helps officials and communities implement better warning systems and emergency responses to mitigate risks and improve safety during such events.