What is the maximum height to which water can realistically be drafted?

The maximum height to which water can realistically be drafted is generally considered to be in the range of 20 to 25 feet. This is based on the principles of atmospheric pressure and the limitations imposed by the vacuum created when attempting to draw water.

When drafting water, the pump system relies on the creation of a vacuum, which depends on the surrounding atmospheric pressure. As one attempts to draft water from a deeper source, the ability to maintain an effective vacuum decreases. Typically, the effective limit is around 25 feet under ideal conditions, but various factors such as temperature, altitude, and the condition of the equipment can influence this height.

In practical firefighting scenarios, it's important to acknowledge that while some may suggest trying to draft from depths greater than 25 feet, the efficiency and reliability of the draft diminish significantly beyond this range. Thus, the understanding that 20 to 25 feet is the maximum practical height provides essential guidance for ensuring effective water sourcing during operations.