Swales
A swale is a wide shallow ditch in which water can flow to a suitable outlet.
The channel should be protected with grass or other vegetation and can be lined with appropriately sized stone to prevent erosion within the swale. Stone or grass is preferable in swales which don't grow vegetation well due to shade or too steep or long for grass to prevent erosion.
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A swale lined with stone is called a Dry Creek Bed.
see also: Erosion Control or Drainage Solutions.