The crown weir of a trap is related to which plumbing concept?

The crown weir of a trap is directly related to the concept of drainage. In plumbing, a trap is designed to hold a small amount of water, which serves as a barrier to prevent sewer gases from entering a building. The crown weir refers to the point at which the water in the trap spills over and begins draining. This design is essential for maintaining proper drainage because it allows wastewater to flow out of the system while simultaneously retaining water to create that crucial seal against gas escape. Effective drainage systems rely on properly functioning traps, including their crown weirs, to manage flow and maintain sanitary conditions. Understanding the role of the crown weir helps in appreciating how traps contribute to the broader drainage system within plumbing.