Final answer:
Special causes for severe flooding events include a stalled hurricane, prolonged drought followed by intense precipitation, rainfall coinciding with snowmelt and ice dams in a river, and the failure of a dam.
Step-by-step explanation:
Flooding events can be caused by several factors. The special causes for severe flooding events include:
- Stalled hurricane: When a hurricane remains stationary over an area for an extended period, it can result in heavy and prolonged rainfall, leading to flooding.
- Prolonged drought followed by intense precipitation: A dry spell followed by heavy rain can result in the inability of the soil to absorb the water, leading to flooding.
- Rainfall coinciding with snowmelt and ice dams in a river: When rainfall occurs together with the melting of snow and the presence of ice dams in a river, it can lead to rapid rises in water levels and cause flooding.
- Failure of a dam: If a dam fails or is breached, it can release a large amount of water downstream, causing severe flooding.