rigole

furrow, channel (small trench cut in the soil or rock for irrigation or for planting seeds); groove, fissure, hollow (naturally occurring depression or furrow, often due to a meteorological event); furrow (deep wrinkle, usually in the face); rivulet, streamlet

Inherited from Old French regol, from Middle Dutch regel (“row”), from Latin rēgula (“straight line”). Doublet of rail, règle, reille, and rille.