What is the purpose of using a master stream during firefighting operations?

Using a master stream during firefighting operations serves the purpose of providing a concentrated delivery of water over a large area. Master streams are typically deployed from aerial devices or ground-based monitors and are capable of delivering a high flow rate to deliver significant amounts of water quickly when tackling large, aggressive fires. This high volume flow is essential for effectively combating substantial fires, especially when other methods may not provide adequate extinguishing capability.

A master stream is particularly advantageous for suppressing large flames and cooling surrounding hazards, reducing the risk of the fire spreading. Smaller operations or localized firefighting efforts typically do not require the volume or reach of a master stream, which is why this approach is not suited for extinguishing small fires or attacking fires from within. Additionally, while master streams can create some visibility by displacing smoke, their primary function is to control and suppress fire effectively through the strategic application of water.