What is the function of the fixture flood test?

The function of the fixture flood test is primarily to identify leaks in the entire drainage system. This test involves filling fixtures with water to a specified level and observing whether water escapes from the system over a defined period. By doing so, it comprehensively assesses the integrity of the drainage components, including pipes, joints, and connections within the entire system. This is crucial for ensuring that the drainage system operates effectively and does not contribute to water loss or potential water damage in the surrounding areas.

The other options do not accurately describe the purpose of the fixture flood test. While checking the pressure, ensuring that holding tanks are functioning, and measuring the capacity of holding tanks are important aspects of plumbing systems, they pertain to different testing methods rather than the specific focus of the fixture flood test on leak detection. This distinction underscores the importance of recognizing the specific objectives of various plumbing tests in maintaining system integrity and performance.