What kind of water system does not require pumps to operate?

A gravity-feed system is designed to operate without the need for pumps, relying instead on the force of gravity to move water through the system. In these systems, water is stored at a height—such as in elevated tanks or reservoirs—allowing it to flow naturally downward through pipes due to gravitational pull. This ensures a continuous and reliable water supply without the additional energy and maintenance costs associated with pumps.

In contrast, pumped systems utilize mechanical pumps to move water, often required to increase pressure or overcome elevation changes. Network systems can involve various configurations, including both gravity and pumped components, and may not function without pumps depending on the design. Centrifugal systems are a type of pumped configuration, specifically designed to propel fluids through the use of rotational motion, making them reliant on pumps to operate effectively. Thus, the only option that operates independently of pumps is the gravity-feed system.