NFPA 1142 Rural Water Supply
Minimum on-site water supply Q = (V * occupancy * construction) / 5 per NFPA 1142 §5, with 1.5x exposure and 0.5x sprinkler multipliers; recommended tanker trip count.
Formula and source
Q_total = (V * O * H) / 5 per NFPA 1142 §5. 1.5x exposure multiplier when adjacent structure within 50 ft. 0.5x sprinkler reduction when UL-listed system present.
NFPA 1142-2022 (Standard on Water Supplies for Suburban and Rural Firefighting) §5.
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