man-made ditch or tunnel through which water flows
# road
If your language has a word for a road or path that people have made smooth by filling in the low places and lowering the high places, you can use it here.
A launderer is either 1) a man who washes wool that someone has cut from the sheep, "Wool Washer Field," or 2) a woman who washes dirty clothes, "Clothes Washer Field."