Beyond the flats was a country creased with draws and dry arroyos.

There's just a hundred and one of these dry arroyos that you can't see until you are right onto them.

Through the shallows turned and twisted dozens of dry arroyos, all gradually trending toward the Platte,-thedrainage system of the frontier.

Dry arroyos suddenly filled and became swift torrent, rolling big boulders down their courses.