Automatic fire sprinkler systems and other water-based fire protection systems require a reliable water source. NFPA 13 and other standards provide a list of acceptable water supply options. When water is supplied via connection to a public or private waterworks system, a hydrant flow test is typically conducted to characterize the capabilities of the water supply. NFPA 291 highlights the proper procedures, equipment and data collection for these tests. In addition, NFPA 13 advises to evaluate whether or not an adjustment is needed to the raw flow test data collected and intended to be used for the basis of a system design. The information and requirements have been fluid in NFPA 13 over the past several code revision cycles. The 2025 edition of NFPA 13 provides updated information regarding this issue. It is likely that the requirements provided will remain for at least a short period, and hopefully have achieved consensus. The SFPE Position Statement 2020-1 identifies that engineers are required to evaluate the water supply data to determine if an adjustment is necessary. This is consistent with the requirements identified in NFPA 13. This presentation will discuss the current requirements, changes to the 2025 edition of NFPA 13, and other resources. This presentation will identify factors for consideration in adjusting water supply data and some negative consequences of artificially adjusting water supply data.

Upon completion of this seminar, attendees will be able to:

• Describe the process of assessing water supplies and calculating system demands.
• Identify safety factors inherent in the hydraulic calcuation process.
• Identify factors for consideration in adjusting water supply data, along with potentially negative consequences of artificially adjusting water supply data.