It looks like the tags drain and drainage are getting blurred. It seems like drain should refer to indoor plumbing issues and drainage should refer to outdoor/landscaping issues (or something along those lines), but I don't know enough about them to write good descriptions to draw that line. Anyone want to take a crack at it?
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1Also the [dwv] tag: diy.stackexchange.com/questions/tagged/dwv– Niall C. ModJul 28, 2012 at 4:36
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2 Answers
Drain: A channel or pipe carrying off surplus liquid, esp. rainwater or liquid waste.
Drainage: The means of removing surplus water or liquid waste; a system of drains.
A drain would refer to a single pipe, channel, or path used to remove liquid. Whereas drainage, refers to the entire system made up of one or many drains.
I would understand drainage to refer to the water flow through a landscape, or a field or subsoil, whereas a drain would be the man-made aspects - pipes, sewers, channels etc.
