Compared to distribution mains, which characteristics do transmission mains typically have?

• A. More side connections
• B. Lower pressure
• C. Higher pressure and longer distances with fewer side connections
• D. Smaller diameter

Answer: (C)

Transmission mains are built to move large volumes of water over long distances from treatment facilities to the distribution system, so they operate at higher pressure to push water through long runs and across any elevation changes. They also run for long spans with relatively few side connections, which helps keep the hydraulic system simpler and more controllable and reduces potential leaks and pressure fluctuations. In contrast, distribution mains near customers have many connections and branches and operate at lower pressures to safely deliver water at usable pressures to homes and businesses. This combination of high pressure, long runs, and few lateral connections is what makes transmission mains fit the described characteristics.