What should be done if a building's standpipe is totally unusable?

• A. Immediately evacuate the building
• B. Lay supply hose up an interior stairwell as a last resort
• C. Use portable pumps exclusively
• D. Retreat to a safe distance

Answer: (B)

In the situation where a building's standpipe is totally unusable, laying supply hose up an interior stairwell as a last resort is the most practical and effective response. This action allows firefighters to connect directly to a water supply and deliver water to the upper floors where it may be needed for firefighting operations.

When the standpipe system fails, relying on it would hinder firefighting efforts, so establishing a new supply line through the stairwell enables access to water for suppression efforts without delay. Firefighters often need to adapt to challenging circumstances, and using an interior stairwell for hose deployment provides a clear path to service multiple floors of the building.

In contrast, immediately evacuating the building or retreating to a safe distance might be necessary if conditions are life-threatening, but these actions do not address the immediate need for water to combat a fire. Portable pumps might be considered, but they may not be as effective as a direct supply hose in many scenarios, particularly in larger buildings where height and distance become factors. Thus, laying supply hose provides a direct and immediate solution to a critical problem during a firefighting operation.