How far must apparatus be placed from the flight path of helicopters dipping water?

The correct answer is based on safety considerations and operational protocols designed to protect both personnel and equipment during helicopter water-dipping operations. A distance of 150 feet is specified to ensure a safety buffer that prevents interference with the flight path of helicopters. This distance balances the need for proximity to water sources with the requirement to maintain a safe operating environment, minimizing risks from rotor wash, falling debris, or any other potential hazards associated with helicopter operations.

Being within the specified distance can pose serious dangers not only to personnel but also to the apparatus themselves, as rotor wash can create severe turbulence. Therefore, the established distance of 150 feet is a guideline that ensures both safety and operational efficiency.