What type of streams flow at least 350 GPM and are crucial for controlling large fires?

Master streams are essential for controlling large fires because they are designed to deliver high volumes of water quickly, typically at a flow rate of 350 gallons per minute (GPM) or more. This high flow rate is critical when combating large-scale fires, as it helps to quickly suppress fire spread and protect structures or environments at risk.

These streams are generally deployed from aerial devices, like ladder trucks, or portable monitors, and can project water over long distances. The capability to deliver such high volumes enables firefighters to create a protective barrier around the incident and to reach areas that may be difficult for smaller handlines to access effectively.

While other types of streams, such as fog and solid streams, serve important roles in firefighting, they do not typically match the flow rate and application efficiency that master streams provide in large-scale firefighting situations. Handlines, although valuable for tackling fires at close range or in confined spaces, do not flow at the same volume necessary for larger incidents.