What is a test for determining the efficiency of a plumbing drainage system?

A smoke test is utilized to determine the efficiency of a plumbing drainage system by introducing non-toxic smoke into the system and observing where the smoke emerges. This test helps identify issues such as leaks, blockages, or improper venting in the drainage system. By observing the smoke's path, inspectors can pinpoint malfunctioning areas, ensuring that the plumbing system is working effectively and efficiently.

The other options focus on different aspects of plumbing systems. A pressure test checks for leaks and the structural integrity of piping under pressure. Water flow analysis assesses the flow rate and pressure in the system to ensure adequate supply but doesn’t specifically evaluate drainage efficiency. A temperature test measures the heat of water in the system, which is useful for identifying issues with hot water supply but does not give insights into drainage efficacy. The smoke test precisely targets the operational efficiency of drainage systems, making it the most relevant method in this context.