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  1. Flat-floored, vertically walled channel of an intermittent stream typical of semiarid climates; often applied to such features of southwestern United States. Synonymous with wadi and wash.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A term applied in the arid and semiarid regions of the Southwestern United States to the small, deep, flat-floored channel or gully of an ephemeral stream, usually with vertical or steeply cut banks of unconsolidated material at least 60 cm high; it is usually dry, but may be transformed into a temporary watercourse or short-lived torrent after heavy rainfall. CF: dry wash
  3. The small intermittent stream or rivulet that occupies such a channel.---Etymol: Spanish, stream, brook; gutter, watercourse of a street. See also: wadi; nullah. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms

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