Water Supply, Secondary (Design) : The estimated rate of flow [expressed in gpm (L/min) for a prescribed time period] that is necessary to control a major fire in a building or structure
NFPA 1142 Standard on Water Supplies for Suburban and Rural Fire Fighting, 2001 ed. https://www.nfpa.org/assets/files/AboutTheCodes/11 42/1142-A2001-ROP.PDF, (Std: Wtr Supp for Suburban and Rural Fr Fight - Amer) {383 NFC}