ephemeral stream

A stream or reach of a stream that flows only during and for short periods following precipitation is known as an ephemeral stream. Also called a stormwater channel, it receives no extensive long-term water supply from melting snow or other sources, and its channel is, at all times, above the water table. Such streams are common throughout the United States, even in the humid East, where it is small, finger-width streamsrills or rivulets—that are ephemeral. Although stream types are commonly divided according to their behavior over time— ephemeral and perennial—a stream may also be classified as exotic

Jeffery Renard Allen