What is the purpose of a drainage system?

The purpose of a drainage system is fundamentally about managing waste. It is designed to convey sewage and liquid waste from various fixtures within a building to a treatment facility or a disposal site. This system ensures that waste is efficiently removed from living or working spaces in a safe and sanitary manner, preventing contamination and maintaining public health. Proper drainage is essential to prevent backups, overflows, and other plumbing failures that can lead to unsanitary conditions.

The other choices address different aspects of plumbing systems. Supplying clean water to fixtures relates to the supply system rather than drainage. Structural support refers to the framework of plumbing, and preventing leaks pertains to the integrity of plumbing materials and connections, which are separate concerns from the main function of drainage.