Plural of drainage; systems or processes for removing excess water or liquid from land, buildings, or the body.
From 'drain' + '-age' (suffix forming nouns describing processes or conditions) + '-s' (plural). The '-age' suffix appears in many English words describing processes or collections (drainage, storage, voltage).
Drainage systems are invisible infrastructure that shaped civilizations—the Romans' drainage innovations allowed them to build permanent cities on previously swampy ground. Modern city planners still grapple with the same basic problem that concerned ancient engineers: how to move water where it doesn't belong.
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