He glanced around for tracks, but at this point the floor of the arroyo was almost one sheet of solid rock.
-- Louis L'Amour, Borden Chantry
Billy's last words were like the warbling of a bird about to spring from a twig; just as the roar in an arroyo increases as the wall of water nears, so the confused murmur of the crew rose in the ears of the officers.
-- Herman Melville, Billy Budd
Arroyo is an Americanism, adopted from the Spanish term; akin to Latin arrūgia, "mine shaft."