When choosing relay lines as the supply option, what should be ensured prior to installing the relay?

When selecting relay lines as the supply option, ensuring an adequate initial water supply is critical for effective firefighting operations. Relay operations involve moving water from a source, often a significant distance away, to the fire scene. If there is not enough water available initially, the fire suppression effort could falter before it even begins. Adequate supply ensures that there is sufficient water to maintain pressure and flow rates necessary for firefighting, thereby supporting the firefighters on the front lines in managing the incident effectively.

While apparatus readiness, water quality, and fuel availability are important considerations in the overall operational readiness of responding units, they do not directly address the immediate need for a sufficient volume of water to sustain firefighting efforts during a relay operation, which is the primary focus in this context.