In plumbing, what does the term 'drainage' refer to?

The term 'drainage' specifically refers to the system that carries waste water away from fixtures. In plumbing, drainage systems are designed to remove used water from sinks, toilets, bathtubs, and other plumbing fixtures, ensuring that waste is efficiently transported to the sewer or septic system. This is a fundamental aspect of sanitation and plumbing design, as effective drainage is crucial for preventing water accumulation, odors, and potential health hazards.

The other options pertain to different aspects of plumbing. The delivery of clean water to fixtures falls under the water supply system, which is separate from drainage. The installation process for new plumbing refers to the actual setup and labor involved, while maintenance schedules focus on the upkeep and care of existing plumbing systems. Understanding the distinction between these functions is essential for grasping the overall plumbing system and its components.