What is the drainage fixture unit value assigned to a bathtub with a shower head?

The drainage fixture unit value assigned to a bathtub with a shower head is typically 2 DFU. This value is important because it helps plumbing designers and engineers determine the proper sizing of the drainage system to handle the anticipated flow from the fixture.

In this context, a bathtub generally has a fixture unit value that accounts for its drainage capacity and usage. When a shower head is included, the combined usage increases the flow and potential drainage requirements, leading to the assignment of a higher value.

The 2 DFU designation reflects a typical scenario where the bathtub can be used concurrently with the shower, justifying the increase in drainage capacity needed in the plumbing system. This value helps maintain efficient drainage and prevents issues such as clogging or backups by ensuring that the plumbing infrastructure can adequately support the fixtures' demands.

This understanding is critical for those involved in plumbing design and installation, as proper fixture unit assignments are essential for creating effective and compliant drainage systems.