What type of drains do laundry, galley sinks, and showers utilize?

Laundry, galley sinks, and showers utilize waste drains. This type of drain is specifically designed to carry away wastewater produced by various household activities, such as washing clothes or dishes, and by showering. Waste drains are essential for maintaining hygiene and the proper functioning of plumbing systems, as they ensure that wastewater is efficiently removed from living spaces.

While other types of drains exist—such as soil drains for removing excess groundwater or storm drains for managing surface water runoff—these are not applicable to the context of laundry, galley sinks, and showers, which are primarily concerned with the disposal of used water. Overflow drains are meant to prevent flooding by allowing excess water to escape from a fixture; however, they do not serve the same primary purpose as waste drains.