Scupper

 ( Watercraft Components ) 

A scupper is an opening in the side walls of a vessel or an open-air structure, which allows water to drain instead of pooling within the bulwark or Gunwale of a vessel, or within the curbing or walls of a building. There are two main kinds of scuppers:

1. Ships have scuppers at deck level, to allow for ocean or rainwater drain-off.
   William Henry Smyth (2025). 9781934757413, Fireship Press. . ISBN 9781934757413
2. Buildings with railed rooftops may have scuppers to let rainwater drain instead of pooling within the railing. Scuppers can also be placed in a parapet, for the same purpose.

• Schematics employed in hydraulic diagrams