a conduit, ditch, or the like, for draining water from an area.

drainage + way

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Put a stake in the center of the lowest portion of the drainageway where you
  want the berm.
As such, a special use permit for disturbing a major drainageway is not
They are usually installed in a drainageway or other point of discharge from a
  disturbed area.
Partially blocking a drainageway or small ditch to create your wetland by
  trapping storm water needs more planning.
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