The largest pipes in a water distribution system are:

• A. Secondary feeders
• B. Distributors
• C. Primary feeders
• D. Indicating feeders

Answer: (C)

The largest pipes in a water distribution system are the primary feeders because they form the main backbone that carries the highest flows from the source toward the rest of the network. Their large diameter minimizes friction losses and pressure drop as water moves from treatment facilities or reservoirs into the wider system. From these primary feeders, water is then routed into secondary feeders, which are smaller and carry water deeper into the distribution area, and finally into distributors, which are even smaller and deliver water to individual service lines. The term indicating feeders isn’t a standard part of the typical hierarchy and doesn’t describe the main high-flow mains, so it isn’t competing with the largest-pipe role.