colmatage

noun
col·ma·tage | \ˈkälmətij\
plural -s

Definition of colmatage 

New Zealand : the impounding of silt-laden water to build up low-lying areas

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History and Etymology for colmatage

French, from colmater to impound silt-laden water (from colmate silt, from Italian colmata, from colmare to heap up, to build up by silt-laden water, from colmo top, summit, from Latin culmin-, culmen) + -age

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