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Two scuppers cut into either side of this outdoor stairwell prevent water from building up and making the stairs slippery. 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 gunwales of a vessel, or within the curbing or walls of a building.
Water that does not drain off the side of the deck or through a hole in the hull, which it would typically do via a scupper, instead drains down into the ship into the bilge. This water may be from rough seas, rain, leaks in the hull or stuffing box , or other interior spillage.
These elements, as are the other roof drainage system components, gutters, scuppers [3] [4] or downspouts, have to be sized to perform well, according to the amount of precipitation that they are intended to help alleviate. Leader heads can also receive water from scuppers, which are used predominantly through flat roofs’ parapets.
Gunwale: (pronounced "gunnel") the upper longitudinal structural member of the hull, typically fitted with scuppers to drain the deck. Hatch: an opening in the deck or cabin of a vessel, with a hinged, sliding, or removable cover. Heads: a marine toilet, deriving from toileting at the catsheads in square rigger days.
Rainfall could send debris from hillsides charred by wildfires rushing down ravines and through drainage ditches into the Pacific Ocean.
Most flat roof systems (properly called "low-slope roof systems") are designed with a slight pitch to shed water off the sides, usually into gutters, scuppers, internal drains, or a combination of these. [5] When a scupper or drain is clogged or fails for other reasons, storm water tends to pool around that low area.
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