flumes

/F L UW1 M Z/
noun
  1. 1

    A ravine or gorge, usually one with water running through.

  2. 2

    An open channel or trough used to direct or divert liquids.

verb
  1. 1

    To transport (logs of wood) by floating them along a water-filled channel or trough.

Source: https://en.wiktionary.org/wiki/flume, https://en.wiktionary.org/wiki/flumes