aggrading

These aggrading rivers, which have channels but no valleys, spread their muddy floods -- which in the case of the Oxus sometimes equal the average volume of the Mississippi -- far and wide over the plain, washing the bases of the desert dunes.

The Elements of Geology William Harmon Norton 1900

While aggrading streams thus tend to shift their channels, degrading streams, on the contrary, become more and more deeply intrenched in their valleys.

The Elements of Geology William Harmon Norton 1900

The aggrading streams by which flood plains are constructed gradually build their immediate banks and beds to higher and higher levels, and therefore find it easy at times of great floods to break their natural embankments and take new courses over the plain.

The Elements of Geology William Harmon Norton 1900

At Lucknow an artesian well was sunk to one thousand feet below sea level without reaching the bottom of these river-laid sands and silts, proving a slow subsidence with which the aggrading rivers have kept pace.

The Elements of Geology William Harmon Norton 1900

A river actively engaged in aggrading its valley with coarse waste builds a flood plain of comparatively steep gradient and often flows down it in a fairly direct course and through a network of braided channels.

The Elements of Geology William Harmon Norton 1900

Flood-plain deposits of great thickness may be built by aggrading rivers even in valleys whose rock floors have never been thus widened.

The Elements of Geology William Harmon Norton 1900

In part the loess seems to have been washed from glacial waste and spread in sluggish glacial waters, and in part to have been distributed by the wind from plains of aggrading glacial streams.

The Elements of Geology William Harmon Norton 1900

In either case the stream continues aggrading or degrading until a new gradient is found where the velocity is just sufficient to move the load, and here again it reaches grade.

The Elements of Geology William Harmon Norton 1900

Organic deposits are now forming by the decay of vegetation in swampy tule (reed) lands and in shallow lakes which occupy depressions left by the aggrading streams.

The Elements of Geology William Harmon Norton 1900

Temporary settlement and reconstruction along rapidly aggrading rivers and on unstable slopes should be avoided.

NZ On Screen 2010