GULLY, ALSO GULLEY

(1) A channel or miniature valley cut by concentrated runoff but through which water commonly flows only during and immediately after heavy rains or during the melting of snow; may be Dendritic or branching or it may be linear, rather long, narrow, and of uniform width. (2) A small valley or gulch. The distinction between Gully and Rill is one of depth. A gully is sufficiently deep that it would not be obliterated by normal tillage operations, whereas a rill is of lesser depth and would be smoothed by ordinary farm tillage.