When tying the pumper into a plug, what percentage allows for the addition of three lines?

The correct answer pertains to the understanding of water supply systems and how pumpers operate when connected to a hydrant or plug. When tying into a plug, the guideline is that maintaining a water supply availability of 0-10% allows for the addition of three lines effectively. This range ensures that the pumper can maintain sufficient pressure and flow while also accommodating additional lines being added for various firefighting tactics.

This percentage ensures that there's enough water to support the operations without compromising the pump's capability to provide adequate flow to those lines. In practice, keeping the demand within this range allows for optimized water delivery, which is critical in firefighting scenarios where every second counts and water supply can make the difference between controlling a fire or allowing it to spread further.

In contrast, higher percentages may risk reducing the overall efficiency of the pump, leading to insufficient pressure, which can severely impact firefighting efforts during critical moments. As such, understanding these operational parameters is essential for effective firefighting strategy and resource management.