What unit measures flow rate in hydrants?

The flow rate in hydrants is typically measured in gallons per minute (GPM). This unit is widely used in the fire service to determine the amount of water available for firefighting efforts. GPM provides a clear understanding of how much water can be supplied from a hydrant over the course of one minute, which is crucial for calculating how effective a water supply can be during fire operations.

While other units like liters per second, liters per minute, and gallons per hour could technically be used to measure water flow, they are not standard in the context of fire hydrants in most regions, particularly in the United States, where gallons per minute is the predominant measurement used by fire departments. This makes it easier for firefighters to communicate and understand the available flow when responding to incidents.