In a water system, what is the largest diameter pipe known as?

The largest diameter pipe in a water system is referred to as a primary feeder. This pipe is crucial because it serves the essential role of transporting a substantial flow of water from the water source (like a treatment plant) to different areas within the distribution system. This feeder pipe is designed to handle high volumes of water to ensure that there is adequate supply pressure and capacity to meet the demands of various users, such as residential, commercial, and firefighting needs.

In some contexts, the primary feeder might branch out into smaller pipes or distribution lines that connect to consumers or smaller networks, but the primary feeder itself is crucial in maintaining the integrity of the entire water distribution system. It allows for effective pressure management and helps ensure that water is available even during peak demand times.