It often occurs that a stream, after having built a flood plain, ceases to aggrade its bed because of a lessened load or for other reasons, such as an uplift of the region, and begins instead to degrade it.
"The Elements of Geology"
William Harmon Norton
After building this sheet of waste the streams ceased to aggrade and began the work of destruction.
"The Elements of Geology"
William Harmon Norton
It has therefore been slowly subsiding and its streams, although continually carried below grade, have yet been able to aggrade the surface as rapidly as the region sank, and have maintained it, as at present, slightly above sea level.
"The Elements of Geology"
William Harmon Norton