Fuel Moisture Content
The most important fuel factor.
Fuel moisture is the amount of water contained within the fuel, sometimes expressed as a percentage.
Can also mean ratio of live and dead fuels.
Governs how easily fuel can be ignited and how much of it’s mass is available for combustion.
Horizontal uniformity of fuels.
Closely spaced and continuous vs breaks.
Affects fire spread rates.
Continuous Fuels shown in image above.
Scattered Fuels shown in image above.
Wildland fuels are classified into three broad size classes. Size breakdown is based on the drying/ wetting constants that correlate to surface area to mass ratio.
Fine Fuel Size shown in image above.
Medium Fuel Size shown in image above.
Large Fuel Size shown in image above.
Just like arranging kindling when starting a campfire, the vertical and horizontal arrangement of wildland fuels has an impact on how they ignite and burn.
Fuels that due to their positioning, wick or transport fire from surface to aerial fuels.
Can be expressed in tonnes/hectare.
Affects intensity of a fire.
Heavy Fuel Loading shown in image above.
Light Fuel Loading shown in image above.