Do all boats have scuppers?
Virtually all ships, as well as boats large enough to have decks above the waterline, are made with some form of scupper. These often include flap or ball designs that enable water to flow off of the decks, but not back into the ship should the scupper opening dip below the waterline in high seas or rough waters.
What is the difference between a scupper and drain?
Roof scuppers are not the same as roof drains. Roof drains channel water through the deck of the roof into a piping system that carries water away, while a scupper allows water to drain through an opening in the side of the roof edge.
Why is it called a scupper?
All we know for sure is that scupper meant “to ambush and massacre” in 19th-century military slang.