Firefighters can be called to respond to incidents in different parts of the country,
climate zones, and fuel types.
There are geographic and regional distinctions across the country in regards to the
predominate fuel types in the area.
The amount of water in the soil and elevation change are some of the reasons behind
different fuel types.
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FUEL DISTRIBUTION
For dead fuels, the size and shape of a fuel determines how the fuel reacts to its
environment and how long it takes to dry out or absorb moisture.
Size and shape classifications are:
o 0-1/4" diameter
, o 1/4"-1" diameter
o 1"-3" diameter
o 3"-8" diameter
Fuels within the same size class are assumed to have similar drying and wetting
properties, as well as preheating, and ignite at similar rates during the combustion
process.
Smaller fuels dry out and or absorb moisture faster than larger fuels.
Give this one a try later!
SIZE AND SHAPE
The amount of fuel present expressed quantitatively in terms of weight of fuel per unit
area. This may be available fuel (consumable fuel) or total fuel and is usually dry
weight. Expressed in tons per acre.
Dry weight of fuels refers to what the fuels would weigh dry.
The loading of fuels in any given area does not necessarily mean that fire will burn
with great intensity
Give this one a try later!
FUEL LOADING
Moisture content is the single most important factor in determining how well a fuel
will ignite and burn. Two categories:
1. Live Fuel - Living plants, such as trees, grasses, and shrubs. The moisture content in
live fuels is controlled by plant species, age of the plant, time of year, and drought
conditions.
2. Dead Fuel - Fuels with no living tissue. The moisture content in dead fuels is
controlled by humidity, precipitation, sunlight, wind, and the size, and shape.
In general, at the height of the growing season, live fuel moistures will be at their
highest and will progressively decrease throughout the fire season, whereas dead fuel
moistures can fluctuate frequently throughout the fire season based on immediate
climate zones, and fuel types.
There are geographic and regional distinctions across the country in regards to the
predominate fuel types in the area.
The amount of water in the soil and elevation change are some of the reasons behind
different fuel types.
Give this one a try later!
FUEL DISTRIBUTION
For dead fuels, the size and shape of a fuel determines how the fuel reacts to its
environment and how long it takes to dry out or absorb moisture.
Size and shape classifications are:
o 0-1/4" diameter
, o 1/4"-1" diameter
o 1"-3" diameter
o 3"-8" diameter
Fuels within the same size class are assumed to have similar drying and wetting
properties, as well as preheating, and ignite at similar rates during the combustion
process.
Smaller fuels dry out and or absorb moisture faster than larger fuels.
Give this one a try later!
SIZE AND SHAPE
The amount of fuel present expressed quantitatively in terms of weight of fuel per unit
area. This may be available fuel (consumable fuel) or total fuel and is usually dry
weight. Expressed in tons per acre.
Dry weight of fuels refers to what the fuels would weigh dry.
The loading of fuels in any given area does not necessarily mean that fire will burn
with great intensity
Give this one a try later!
FUEL LOADING
Moisture content is the single most important factor in determining how well a fuel
will ignite and burn. Two categories:
1. Live Fuel - Living plants, such as trees, grasses, and shrubs. The moisture content in
live fuels is controlled by plant species, age of the plant, time of year, and drought
conditions.
2. Dead Fuel - Fuels with no living tissue. The moisture content in dead fuels is
controlled by humidity, precipitation, sunlight, wind, and the size, and shape.
In general, at the height of the growing season, live fuel moistures will be at their
highest and will progressively decrease throughout the fire season, whereas dead fuel
moistures can fluctuate frequently throughout the fire season based on immediate
