Which concept is the path that determines the limiting condition for system performance?

• A. Looped mains
• B. Critical Path
• C. GPM vs PSI
• D. Surge/hammer

Answer: (B)

The limiting condition for how a system performs is set by the bottleneck path—the one route through the network that has the least capacity relative to demand. In an irrigation layout with multiple feed paths to zones, the overall flow and pressure available to the entire system are constrained by this most restrictive path. Identifying it helps you know where improvements will have the biggest effect, such as expanding a pipe, reducing losses, or adjusting valve settings to raise overall performance. The other options describe different aspects of irrigation design—looped mains as a layout choice for reliability, GPM vs PSI as a flow–pressure relationship, and surge/hammer as a transient pressure event—not the specific path that determines system limits.