In a major leak, the first consideration is to

• A. Increase the line pressure
• B. Isolate a section and maintain service
• C. Partially or totally shut the line down
• D. Call for downstream damages assessment

Answer: (C)

When a major leak occurs, the first priority is to stop the flow and contain the problem. Shutting the line, either partially or completely, isolates the leaking section so water loss is halted and pressure at the leak site drops. This creates a safer work environment for responders, prevents further damage, and buys time to locate and repair the leak without uncontrolled outflow. After the line is isolated and secured, you can address service restoration and downstream impacts, but those steps come after the immediate risk is controlled. Increasing pressure would worsen the leak, and calling for downstream damages assessment is a follow-up action once the hazard is mitigated.