The interlocking network of water mains that compose a water distribution system is a

• A. Grid
• B. Loop
• C. Gridiron
• D. Network

Answer: (A)

In water distribution, the interlocking arrangement of water mains is called a grid. This term describes a network laid out in a pattern where mains cross-connect to form multiple pathways, providing redundancy so water can reach hydrants from several directions and pressures remain more stable even if part of the system is offline. A loop is a specific feature within such a system—a closed circuit that helps ensure flow around a block—but it’s not the overall name for the entire network. Gridiron is not the standard term for water mains and is more commonly used to describe street layouts, while network is true but too general to capture the specific, orderly cross-connecting pattern that a grid conveys.