What unit is used to measure master stream flow?

• A. GPM
• B. LPS
• C. LPM
• D. CFM

Answer: (C)

Master stream flow is the amount of water delivered by the appliance per unit time, and in Edmonton’s firefighting practice it’s expressed in liters per minute (LPM). This metric fits the Canadian standard and makes on-scene calculations straightforward, since big water flows are commonly discussed in minutes. Using gallons per minute (GPM) would align with U.S. customary units, which isn’t the norm here; liters per second (LPS) describes volume per second and can be less practical for comparing overall flow over a minute, and cubic feet per minute (CFM) is typically used for air or HVAC contexts, not water flow. So liters per minute is the best fit for describing master stream flow.