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

The term "drainage" in plumbing specifically refers to the removal of wastewater from plumbing systems. This involves a network of pipes, fittings, and fixtures that work together to transport waste and used water away from homes and buildings. An effective drainage system is essential for maintaining sanitary conditions, as it ensures that waste does not accumulate in living spaces or contribute to health hazards.

In contrast, the other options pertain to different aspects of plumbing. For instance, the water supply for faucets pertains to the system that delivers clean water for consumption and use, while the water filtration process relates to purifying water for safer usage. Hydraulic pressure management involves controlling the pressure within plumbing systems to ensure optimal flow and prevent issues like bursting pipes or inadequate water pressure. Each of these areas plays an important role in plumbing, but they are distinct from the concept of drainage itself.