1911 Encyclopædia Britannica/Arroyo
ARROYO (O. Sp. arrogio, Lat. arrogium, a rivulet or stream), the channel of a stream cut in loose earth, found often at the head of a gully, where the water flows only at certain seasons of the year.
See also Arroyo (creek) on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.
ARROYO (O. Sp. arrogio, Lat. arrogium, a rivulet or stream), the channel of a stream cut in loose earth, found often at the head of a gully, where the water flows only at certain seasons of the year.