verb (used with object), aggraded, aggrading. Physical Geography.
to raise the grade or level of (a river valley, a stream bed, etc.) by depositing detritus, sediment, or the like.
Compare degrade.

1895–1900; ag- + grade

aggradation [ag-ruh-dey-shuhn] , noun
aggradational, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
aggrade (əˈɡreɪd)
(tr) Compare degrade to build up the level of (any land surface) by the deposition of sediment

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As more water was applied to the land, and because the riverbed continued to aggrade, drainage became an acute problem.
The stream also begins to aggrade, or fill in, with sediment from eroding channel sections upstream.
Marls aggrade behind travertine and tufa structures.
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