For a pipe-schedule sprinkler system, the minimum water flow at thebase of the riserdepends on the occupancy hazard classification, as defined inNFPA 13.
ForOrdinary Hazard (Group 1) occupancies, the minimum required flow at the base of the riser is500 gpm (1,893 L/min).
The 500 gpm flow ensures sufficient water supply to the sprinkler system to suppress fires involving moderate combustibles.
Higher flows (e.g., 700 gpm and 850 gpm) are required for more severe hazards (e.g., Extra Hazard occupancies).
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