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 (a landform created by running water, eroding sharply...
Mulch
Elmira Gulch was the character in The Wizard of Oz who took Dorothy's dog Toto. In Dorothy's dream she was the Wicked Witch of the West.
The plural form of gulch is gulches.
arroyo