In a relay pumping operation, the _________ should be positioned nearest the water source.

In a relay pumping operation, positioning the largest capacity pumper nearest the water source is essential for maximizing efficiency and effectiveness during firefighting efforts. The largest capacity pumper has the ability to draw significant amounts of water quickly and maintain high flow rates over long distances. This is crucial when the water must be transported to a scene that may be far away, as it ensures that there is a steady and reliable supply of water for the firefighting operation.

By having the largest capacity pumper at the source, firefighters can also manage pressure better throughout the system, which minimizes the risk of losing pressure during the relay. This ensures that the attacking lines at the fire scene have enough pressure to effectively combat the flames. Additionally, larger capacity pumpers can handle larger volumes of water, making them better suited for the initial stage of relay pumping operations where efficiency is paramount.