Definitions for "Ephemeral stream"
A watercourse generally without a well-defined channel which flows only in response to rainfall or snowmelt. Ephemeral streams flow for less than 20% of the year during normal rainfall conditions.
A stream that flows only during very short periods during and immediately after periods of rainfall.
A stream that is often one of the outer links of a drainage network and which contains flowing water only during and immediately after a rainstorm which may be fairly intense.
a short-lived system for carrying stormwater