Encyclopedia
Ravine
Gully: a steep-sided valley, often branched, formed as a result of active activity of temporary water flows
Source: "SAFETY IN EMERGENCY SITUATIONS. MONITORING AND FORECASTING OF DANGEROUS GEOLOGICAL PHENOMENA AND PROCESSES. GENERAL REQUIREMENTS. GOST R 22.1.06-99"
(approved by the Decree of the State Standard of Russia dated May 24, 1999 No. 177)