(Irregular plural: gulches).
A narrow gorge with a stream running through it; SYN. flume.

Deep ditch cut by running water (especially after a prolonged downpour).

ETYM French, a place excavated by a torrent, a ravine, from ravir to snatch or tear away, Latin rapere; cf. Latin rapina rapine. Related to Ravish, Rapine, Raven prey.
A deep narrow steep-sided valley (especially one formed by running water).