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

Siphonage refers specifically to the unintentional removal of water from a trap. Traps are crucial in plumbing systems as they contain a small amount of water that acts as a barrier, preventing sewer gases from entering a building. When siphonage occurs, the water in the trap is drawn out, typically due to changes in pressure or the action of fixtures being drained, which can create a vacuum effect. This phenomenon compromises the trap’s ability to block gases and can lead to unpleasant odors and potential health hazards.

Understanding siphonage is vital for plumbers, as it can indicate issues within a drainage system that need to be addressed to maintain proper function and hygiene. Proper venting and design of the plumbing system are essential to prevent siphonage and ensure that traps maintain their water seal.