knick point(headcut) An abrupt change of gradient in the generally smooth long-profile of a stream, typically separating two concave-up segments. It is often attributed to a fall in base level: this, it is said, initiates a knick point which then slowly travels upstream. It may alternatively be owing to a change in rock type or load size, or to tributary entry.

knick point (headcut) Abrupt change of gradient in the generally smooth longprofile of a stream, and typically separating two concave-up segments. It is often attributed to a fall in base level: this, it is said, initiates a knick point which then slowly travels upstream. It may alternatively be due to a change in rock type or load size, or to tributary entry.