Headcuts and headward erosion are hallmarks of unstable expanding drainage features such as actively eroding gullies.
[2] The knickpoint, where a head cut begins, can be as small as an overly-steep riffle zone or as a large as a waterfall.
A small plunge pool may be present at the base of the head cut due to the high energy of falling water.
[3] Groundwater seeps and springs are sometimes found along the face, sides, or base of a head cut.
Another common way to control the knickpoint is by sloping the bank face by laying down fabric and rock.