What is the recommended action if there are changes in flow requirements during a water relay operation?

In a water relay operation, communication is key to ensuring efficiency and safety. When there are changes in flow requirements, notifying the engine operator of these alterations is essential. This allows the operator to make necessary adjustments to the pump's output and pressure to meet the new demands.

The engine operator is responsible for maintaining optimal water flow and pressure to support firefighting efforts. If these requirements change—even slightly—failing to inform the operator can lead to inadequate water supply, potentially jeopardizing firefighting operations and increasing risks for firefighters and those they are trying to protect.

Other options would not effectively address the changing conditions. Ignoring changes can result in dangerous situations due to insufficient water supply. Immediately increasing pressure without assessing the situation could lead to system failures or injuries from sudden pressure changes. Reducing throttle aims to save fuel, but it would fail to maintain appropriate water flow, which is critical during a fire scenario. Therefore, notifying the engine operator is the most responsible and effective action to take.