Largest pipes in a water distribution system are called what?

• A. Service Lines
• B. Primary Feeder
• C. Distribution mains
• D. Transmission mains

Answer: (B)

In a water distribution system, the largest pipes that carry the highest volume of water to feed the rest of the network are the primary feeders. These trunk lines are bigger in diameter than the distribution mains and service lines, serving as the main arteries that deliver water from the source or storage toward the neighborhood mains. They are designed to handle high flow and pressure and are usually routed along major routes with valves to isolate sections as needed. Service lines connect individual buildings and are much smaller, while distribution mains distribute water to smaller feeders and hydrants. Transmission mains exist to move water over long distances into the distribution system, but within the distribution network the term primary feeders refers to those main trunk pipes that carry the largest capacity.