A small stream channel, narrow and steepsided in cross section. Also called "ravine."
a deep, narrow ravine with steep sides, especially one marking the course of a stream or torrent. [AHDOS
A gulch is a deep V-shaped valley formed by erosion. It may contain a small stream or dry creek bed and is usually larger in size than a gully. Occasionally, sudden intense rainfall may produce flash floods in the area of the gulch.