Before revision: This type of swale is created by digging a ditch on contour and piling the dirt on the downhill side of the ditch to create a berm a dug-out, sloped, often grassed or reeded "ditch" or "lull" in the landform.
After revision: This archetypal form of swale is a dug-out, sloped, often grassed or reeded "ditch" or "lull" in the landform.