A scupper is an opening in the side walls of a vessel or an open-air structure, that allows water to drain instead of pooling within the bulwark or gunwales (of a vessel), or curbing or walls (of a building).
There are two main kinds of scuppers:
- Ships have scuppers at deck level, to allow for ocean or rainwater drain off.
- Buildings with railed rooftops can construct scuppers to let rainwater drain off, instead of pooling within the railing of the roof. Scuppers can also be placed in a parapet, for the same purpose.
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