What is the volume of water that leaves a hose or nozzle, typically measured in gallons per minute (GPM)?

The volume of water that exits a hose or nozzle is referred to as flow. It is a critical metric in firefighting, as it quantifies the amount of water being delivered per minute, measured in gallons per minute (GPM). Understanding flow is essential for firefighters when calculating the adequacy of water supply for a fire suppression effort. Different nozzles or hoses can have varying flow rates based on their design, size, and the pressure applied.

Flow impacts how effectively firefighters can suppress a fire and underscores the importance of assessing flow rates when planning for firefighting operations. This knowledge allows for optimal resource allocation and tactical decisions during emergencies. In summary, flow fundamentally describes the dynamic movement of water, and in the context of firefighting, it directly influences the effectiveness of fire suppression activities.