Stream Types

There are three types of streams:

Perennial streams
Water flows in the stream at least 90 percent of the time in a well defined channel.

Intermittent streams
Flow generally occurs only during the wet season (50 percent of the time or less).

Ephemeral streams
Flow generally occurs for a short time after extreme storms. The channel is usually not well defined.

Source:

Hewlett, J.D. Principles of Forest Hydrology. Athens, Georgia: University of Georgia Press, 1982.

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