What term is used for large mains that act as primary feeders in a water system?

The term "primary feeders" is used to describe large mains in a water system that serve as the main supply lines, transporting water from the water treatment plant or storage facilities to distribution networks. These mains are typically larger in diameter and designed to handle higher flow rates, which is essential for meeting the demands of water supply in urban areas or during fire emergencies.

Primary feeders are crucial because they form the backbone of the water distribution system, ensuring that pressure and flow are maintained throughout the network. They are strategically located to minimize pressure loss and provide adequate service to secondary and tertiary mains that branch off to smaller areas or consumers.

In contrast, options like secondary mains and tertiary mains refer to smaller pipes that distribute water from the primary feeders to the end users, while distribution mains are a more general term that encompasses various sizes of pipes used throughout the water distribution system. These distinctions highlight the critical role that primary feeders play in the overall functionality of a water supply system.