Definitions for "Runnel"
A rivulet or small brook.
A long, narrow channel, typically lined with stone and containing still or moving water.
in common usage a rivulet or brook. In mountaineering, a groove in snow created by a falling cornice. Crossing runnels is slow going. A series of runnels often ends an ascent.
A corrugation or TROUGH formed in the foreshore or in the bottom just OFFSHORE by WAVES or TIDAL CURRENTS.
Keywords:  stream, small
a small stream