- Building Drain
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That part of the lowest piping of a drainage system that receives the discharge from soil, waste, and other drainage pipes inside, and that extends 30 inches (762 mm)in developed length of pipe beyond the exterior walls of the building and conveys the drainage to the building sewer.
- Combined Drain
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A building drain that conveys both sewage and storm water or other drainage.
- Sanitary Drain
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A building drain that conveys sewage only.
- Storm Drain
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A building drain that conveys storm water or other drainage, but not sewage.
(International Plumbing Code® 202.0)