This drainage system consists normally of scuppers/inlets made at the deck surface.

• A. Closed Drainage System
• B. Open Drainage System
• C. Through-Deck Drainage
• D. Side Drainage

Answer: (A)

The situation tests how deck drainage is conveyed. Scuppers and inlets on the deck surface gather rainwater and surface water, but the key distinction is what happens after those openings. A closed drainage system takes water collected by deck outlets and carries it away through an enclosed network of gutters and pipes to a discharge point, rather than letting it spill over the deck edge or onto exterior surfaces. This arrangement protects the deck and substructure from standing water, reduces debris and corrosion issues, and allows drainage to be routed to a specific discharge location.

Open drainage, by contrast, would typically discharge water directly overboard or onto an exterior area without an enclosed piping path, which can lead to splash, debris buildup, and more maintenance. Through-deck drainage and side drainage refer to other routing configurations for draining water, but the defining feature here is that the deck outlets feed into a concealed piping system, i.e., a closed drainage system.