In hydrant flow testing, you should maintain flow for at least how many minutes?

In hydrant flow testing, you should maintain flow for at least how many minutes?

• A. 3 minutes
• B. 5 minutes
• C. 1 minute
• D. 2 minutes

Answer: (C)

In hydrant flow testing you want to capture readings that reflect a stable, sustained demand rather than the initial surge when a hydrant is first opened. Keeping the flow for at least one minute allows the hydraulic system to settle, so the flow rate and residual pressure you measure are representative of normal conditions, not transient spikes. This duration is long enough to observe the steady-state behavior without wasting water. Longer runs aren’t generally required for this standard test, though longer tests may be used in other scenarios.

In hydrant flow testing you want to capture readings that reflect a stable, sustained demand rather than the initial surge when a hydrant is first opened. Keeping the flow for at least one minute allows the hydraulic system to settle, so the flow rate and residual pressure you measure are representative of normal conditions, not transient spikes. This duration is long enough to observe the steady-state behavior without wasting water. Longer runs aren’t generally required for this standard test, though longer tests may be used in other scenarios.