What must the receiving pump operator monitor during a water relay operation?

During a water relay operation, it is essential for the receiving pump operator to monitor the intake of the pump to guard against a vacuum. Vacuum conditions can lead to cavitation, which adversely affects the pump's performance and can cause significant damage. When water is being extracted from a supply source through hoses, any significant drop in pressure at the pump intake can create a vacuum, compromising the water flow and potentially leading to pump failure.

By keeping an eye on the intake pressure, the operator ensures that the pump is operating within safe and efficient parameters, which is critical to maintaining an effective water supply for firefighting operations. Proper monitoring can also allow for quick adjustments in the system, such as reducing flow or addressing potential blockages, to maintain optimal operational conditions. This understanding is vital for the overall success and safety of the water relay operation.