The lower reaches of most streams have aggraded; here, enough gravel has accumulated to promote subsurface flow, except during and immediately after rainfall.    From Wordnik.com.  [Ecoregions of Oklahoma (EPA)] Reference

In this way each part of the fan is aggraded and its symmetric form is preserved.    From Wordnik.com.  [The Elements of Geology] Reference

Valley trains are deposits of stratified drift with which river valleys have been aggraded.    From Wordnik.com.  [The Elements of Geology] Reference

When enough water starts moving, it can scour the aggraded riverbeds, sweeping surplus sediment at frightening speeds.    From Wordnik.com. Reference

Several debris flows have aggraded the debris fan, including a large one that deposited the prominent levee at right between 1940 and 1965.    From Wordnik.com.  [CreationWiki - Recent changes [en]] Reference

Valleys aggraded with fine waste form well-nigh level plains over which streams wind from side to side of a direct course in symmetric bends known as meanders, from the name of a winding river of Asia Minor.    From Wordnik.com.  [The Elements of Geology] Reference

We may conceive, then, of the Connecticut valley and the larger trough to the southwest as basins gradually sinking at a rate perhaps no faster than that of the New Jersey coast to-day, and as gradually aggraded by streams from the neighboring uplands.    From Wordnik.com.  [The Elements of Geology] Reference