What is the term used to describe the index number that permits the combination of different fixture types to determine probable maximum load on a drainage system?

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The term "drainage fixture unit" (DFU) is used to describe the index number that allows for the combination of different fixture types to determine the probable maximum load on a drainage system. It quantifies the load a fixture places on the drainage system, facilitating the design and sizing of the system to ensure it can handle the anticipated waste water flow.

What Is the Term Used to Describe the Index Number