Final answer:
In a high-rise operation, the hose should be set up at a steady height above the ground.
Step-by-step explanation:
In a high-rise operation, the hose should be set up at a steady height above the ground. This is because the pressure in the nozzle of the fire hose is less than at ground level, due to the water having to go uphill to reach the nozzle and the increase in speed in the nozzle. The pressure in the water stream becomes equal to atmospheric pressure once it emerges into the air.