In a pumping system, what is the role of suction and discharge piping?

• A. Suction piping discharges water to the irrigation system; discharge piping draws water from the source.
• B. They both store water in separate tanks.
• C. Suction piping connects the water source to the pump; discharge piping carries water from the pump to the irrigation system.
• D. They are only used for air venting.

Answer: (C)

Suction piping is the path that brings water from the source into the pump, while discharge piping carries that water away from the pump to the irrigation system. This separation matters because the pump must first draw water through the suction side, and then deliver it under pressure through the discharge side to push water through the laterals and zones. Suction piping is typically designed to keep the pump primed and free of air, often including components like strainers or foot valves to prevent debris from entering and to maintain flow. Discharge piping is sized and routed to overcome elevation and friction losses so the water reaches the irrigation system with enough pressure for proper distribution. The other descriptions don’t fit because suction and discharge pipes do not store water in tanks, and they are not primarily used for air venting.