There Are Seven Types of Flooding

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There are seven different types of flooding that are widely recognized.
1. 1. Riverine (main stem)) flooding occurs when surface runoff gradually rises to flood stage (overflows natural banks)) and later falls.
2. 2. Flash flooding occurs when runoff reaches its peak in less than six hours, which usually occurs in hilly areas with steep slopes and sparse vegetation. It also can occur in urbanized areas with rapid runoff from impermeable surfaces such as streets, parking lots, and building roofs.
3. 3. Alluvial fan flooding occurs in deposits of soil and rock found at the foot of steep valley walls in arid Western regions.
4. 4. Ice/debris dam failures result when an accumulation of material temporarily blocks the flow of water and raises its surface above the stream bank before giving way.
1. 5. Surface ponding occurs when water accumulates in areas so flat that runoff cannot carry away the precipitation fast enough.
2. 6. Fluctuating lake levels can occur over short-term, seasonal, or multi-year periods, especially in lakes that have limited outlets or are entirely landlocked.
3. 7. Control structure (dam or levee)) failure, has many characteristics in common with flash flooding.

There Are Seven Types of Flooding

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