What does the term "drainage" refer to in plumbing?

The term "drainage" in plumbing specifically refers to the removal of wastewater and sewage from various fixtures within a building. This process is critical for maintaining sanitation and preventing the buildup of harmful substances that can lead to health hazards and plumbing issues. Drainage systems are designed to direct waste away from sinks, toilets, showers, and other plumbing fixtures to a municipal sewer system or a septic system for treatment and disposal.

The focus of drainage is primarily on the effective and safe transport of waste products, which differentiates it from other plumbing terms related to water usage, such as the flow of potable water or distribution to fixtures. Understanding drainage is essential for ensuring that plumbing installations comply with health and safety standards, and it plays a vital role in overall plumbing system functionality and efficiency.