It's called relay pumping.
Making sure where ever there is a fire, they will always have enough water.
Practice is key.
The Marietta Fire Department training Wednesday morning tested the fire boat's capabilities of being a portable hydrant on the river.
They use this if there is a shortage of water for a fire.
They can pump river water through the boat, to the tower and another engine.
Marietta Fire Chief C.W. Durham says they could reach about a block or more down Front Street.
"It gives us the tools we need to better manage an incident if it occurs, because we have already gone through the motions, we know how to do it and it goes much quicker and much more efficiently when we've been out practicing," says Chief Durham.
Wednesday they were able to see how much water the fire boat can handle.
Chief Durham also says they can help other local fire departments, moving the boat to any part of the river and setting up the relay pump.