Draft marks: when firefighting operations are ongoing, the location where water touches the draft marks should be noted at which times?

Draft marks: when firefighting operations are ongoing, the location where water touches the draft marks should be noted at which times?

• A. Prior and during firefighting operations
• B. Only after firefighting is completed
• C. Only before starting
• D. Not necessary

Answer: (A)

Monitoring the water level relative to the draft marks while drafting is essential for maintaining a reliable suction setup. Before you begin drafting, noting the exact point where the water touches the marks establishes a baseline for prime and confirms there’s enough depth to keep the pump submerged. As firefighting operations continue, the water surface can rise or fall, and the source can be used up or replenished. By continuously recording where water touches the draft marks during the operation, you track changes in suction head, detect potential loss of prime, and know when you may need to reposition the intake, switch to another source, or bring in additional water supply. This practice helps ensure a steady stream of water and reduces the risk of losing prime during critical operations.