The aerial ladder waterway delivery system must be capable of flowing how many gpm at what nozzle pressure?

• A. 800 gpm at 90 psi
• B. 1000 gpm at 100 psi
• C. 1200 gpm at 120 psi
• D. 900 gpm at 110 psi

Answer: (B)

Aerial ladder waterway delivery systems are rated to deliver a minimum of 1000 gallons per minute at a nozzle pressure of 100 psi. This rating ensures the elevated stream can be produced with a practical nozzle pressure while accounting for friction losses through the waterway and up to the nozzle. NFPA standards establish this capability so departments can rely on a consistent, substantial flow when attacking fires from height, using common nozzles set around 100 psi to achieve an effective spray or stream.

In practice, 1000 gpm at 100 psi gives enough water volume to handle larger or multi-room fires from an elevated position without requiring excessive pump pressure. The other options describe different flow/pressure combinations that don’t align with the standard aerial waterway rating, so they don’t reflect the expected capability of the system.