What does the term “drainage system” refer to in plumbing?

The term "drainage system" in plumbing specifically refers to a system of pipes that is designed to carry wastewater and sewage away from plumbing fixtures, such as sinks, toilets, and bathtubs, to a sewer or a septic system. This system plays a crucial role in ensuring the proper disposal of waste, maintaining sanitary conditions, and preventing backflow or blockages that could lead to health hazards or plumbing issues.

The focus of a drainage system is entirely about the removal of used water and waste materials, rather than the delivery of clean water or the management of rainwater. Understanding this term is vital for plumbing professionals, as it reflects compliance with local codes and ensures that the systems installed will perform effectively and safely.