Which term describes the reliability of the water supply in pre-incident planning?

• A. Residual water pressure
• B. Reliable fire flow estimate
• C. Average flow rate
• D. Probable supply

Answer: (B)

In pre-incident planning, you need to know whether the water system can consistently meet the required fire flow, so the term that best describes the reliability of the water supply is a reliable fire flow estimate. This phrasing emphasizes not just how much water might be available, but how dependable that amount is under real fire conditions, across different times and system stresses. Residual water pressure focuses on the pressure left after demand changes, which is important but doesn’t directly measure reliability. An average flow rate gives a general sense of delivery but overlooks variability and confidence in meeting demands. Probable supply refers to what you expect to have, but it doesn’t explicitly address the dependability of that supply. The reliable fire flow estimate directly communicates confidence in meeting the needed flow, making it the most appropriate choice.