Noun
flood stage (plural flood stages)
The elevation at which water overflows the natural banks of a river or other body of water in a given portion of the body of water.
The town flooded when the waters were just three feet over flood stage when the sandbags were washed away in three locations.
Flood stage is 10.5 feet. Source: Internet
Flood stage is 9.5 feet. Source: Internet
Flood stage is at 11 feet. Source: Internet