Question 19

The drainage fixture unit value for a wall-hung water closet is three.

The drainage fixture unit value for a wall-hung water closet is three, which reflects its impact on the plumbing drainage system.

A) flushometer tank-type water closet

This option refers to a different type of fixture, specifically a flushometer that typically has a higher drainage fixture unit value than a wall-hung water closet. Therefore, it does not accurately represent the value associated with wall-hung models.

B) Two

A value of two is lower than the established drainage fixture unit value for a wall-hung water closet. This option fails to account for the proper load that a wall-hung water closet places on the drainage system.

C) Three

The value of three is correct as it accurately represents the drainage fixture unit value for a wall-hung water closet. This designation is important for proper plumbing calculations and ensures that drainage systems are appropriately designed to handle the expected waste flow.

D) Four

A value of four exceeds the actual drainage fixture unit value for a wall-hung water closet. This option incorrectly suggests a higher demand on the drainage system than what is necessary.

E) Five

A value of five is also incorrect, as it indicates an even higher drainage fixture unit value than is appropriate for a wall-hung water closet. This option does not align with the standard values used in plumbing systems.

Conclusion

The correct drainage fixture unit value for a wall-hung water closet is definitively three, as it accurately reflects the demand placed on the plumbing system. All other options either underestimate or overestimate the necessary value, emphasizing the importance of correct calculations in plumbing design. This understanding is crucial for ensuring that drainage systems function effectively and efficiently.