In which type of operation are large handlines and master streams more often used?

Large handlines and master streams are more often utilized in defensive operations because these types of operations involve protecting structures and areas from fire spread rather than directly engaging with the fire. Defensive strategies require a significant volume of water to establish a protective boundary, cool hot environments, and control fire spread effectively.

In defensive operations, firefighters focus on maintaining the integrity of structures that are at risk from the fire, which necessitates using larger and more powerful streams to achieve maximum reach and impact. This helps to create a barrier against the flames and reduce the risk of the fire engulfing additional areas or structures. In contrast, offensive operations typically prioritize direct engagement with the fire, often utilizing smaller handlines, as they aim to extinguish the fire at its source. Rescue operations emphasize saving lives and may use various tools and techniques aside from large streams. Ventilation focuses on managing smoke and heat, rather than directly applying water, which is central to the use of large handlines and master streams.