is an opening in the side walls of an open-air structure, for purposes of draining water. They are usually placed at or near ground level, and allow rain or liquids to flow off of the side of the open-air structure, instead of pooling within the walls.
There are three main kinds of scupper used:
- Sailing ships would have scuppers at deck level, to allow for ocean or rainwater drainoff
- 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.
- Scuppers placed a level slightly above ground level are known as "overflow" scuppers, limiting the level of the pooling water. These can be used practically or in decoration, as in a tiered fountain.