What is the term for the edge of a receptacle from which water overflows?

The correct term for the edge of a receptacle from which water overflows is the flood level rim. This term specifically refers to the physical boundary of a fixture, such as a sink or bathtub, that indicates the highest level to which water can rise before spilling over. Understanding this concept is crucial for plumbing design and installation, as it relates to preventing water damage and ensuring that fixtures function correctly.

In plumbing, the flood level rim serves as a critical reference point. It helps professionals set the proper height for overflow drains, ensuring that the water does not exceed the fixture's capacity, thereby minimizing flooding risks. This level is also a key factor in designing drainage systems and ensuring compliance with plumbing codes.

The other terms may refer to different plumbing concepts. The drain rim could be misunderstood as the edge surrounding the drain opening, while overflow level may imply a general concept rather than a specific definition. Water line typically indicates the level of water in a system but does not denote the edge from which overflow occurs. Thus, flood level rim is the precise term needed in this context.