Final answer:
Plumbing systems do not need to be located above the design flood elevation, but should be protected against flood damage.
Step-by-step explanation:
The statement is false. Plumbing systems are not required to be located above the design flood elevation. However, they should be protected against flood damage, especially in areas prone to flooding. This can be achieved by implementing measures such as backflow preventers, flood-proofing techniques, or elevating critical components above the flood level.