What two metrics are typically indicated in hydrant test data?

• A. Weather conditions and wind speed.
• B. Available gallons per minute and residual pressure.
• C. Color of the hydrant and age.
• D. Time since last maintenance.

Answer: (C)

When evaluating hydrants, focus is on hydraulic performance: how much water can be delivered and what pressure remains when water is flowing. The two metrics shown in hydrant test data are the available gallons per minute (flow capacity) and the residual pressure (the pressure left in the system under flow). The GPM figure tells whether the hydrant can meet firefighting flow demands, while the residual pressure indicates whether there is enough pressure at the discharge to push water to the scene without excessive losses in the network. Weather conditions or visual attributes like color or age don’t reflect performance, and time since last maintenance is a maintenance record, not a test output. Understanding these two numbers helps determine if the hydrant and its network meet required fire flow and pressure standards.