Aggradation (1) The raising of stream beds or flood plains by deposition of sediment eroded and transported from upstream. (2) The build-up of sediments at the headwaters of a lake or reservoir or at a point where streamflow slows to the point that it will drop part or all of its sediment load. (3) The building of a floodplain by sediment deposition, the filling of a depression or drainageway with sediment, the building of a fan by deposition of an alluvial mantle. (4) Modification of the earth’s surface in the direction of uniformity of grade or slope, by Deposition, as in a river bed. Opposite of Degradation.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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