Which is NOT one of the four primary factors that influence rate of spread?

Which is NOT one of the four primary factors that influence rate of spread?

• A. Fuel moisture.
• B. Wind.
• C. Slope.
• D. Fuels.

Answer: (A)

Moisture in fuels strongly affects how easily they burn, but in this common framework for rate of spread it’s treated as a characteristic of the fuels themselves rather than a separate controlling factor. The main drivers are the fuels (what and how they’re arranged), the weather that provides heat and oxygen (especially wind), and the slope of the terrain that influences heat transfer to the fuels. Since fuel moisture is a property of the fuels rather than an independent factor, it isn’t counted as one of the primary factors.

Moisture in fuels strongly affects how easily they burn, but in this common framework for rate of spread it’s treated as a characteristic of the fuels themselves rather than a separate controlling factor. The main drivers are the fuels (what and how they’re arranged), the weather that provides heat and oxygen (especially wind), and the slope of the terrain that influences heat transfer to the fuels. Since fuel moisture is a property of the fuels rather than an independent factor, it isn’t counted as one of the primary factors.