Fire Hydrant Distribution Analysis Calculator

Analyze fire hydrant distribution and spacing per ISO/PPC and IFC Appendix C requirements.

Input Parameters

Results

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Hydrants Needed for NFF
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Total Available Capacity
gpm
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Flow Surplus/Deficit
gpm
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Max Spacing per ISO
ft
Note: ISO evaluates hydrant distribution as part of the Public Protection Classification (PPC). Hydrants must be within specified distances and provide adequate flow. IFC Appendix C provides additional guidance on hydrant spacing for new developments.

Reference

ISO Hydrant Distribution Credit: Distance Factor: 0-300 ft = 100%, 300-600 ft = 85%, 600-1000 ft = 70%, >1000 ft = 50% Total Capacity = N x Avg Capacity x Distance Factor Hydrants Needed = NFF / (Avg Capacity x Distance Factor) Max Spacing (ISO): <=1000 gpm=600 ft, <=2500=500 ft, <=3500=450 ft, >3500=400 ft IFC Appendix C: 300-600 ft spacing based on fire flow