Glossary of Terms
A fire set along the inner edge of a fireline to consume the fuels in the path of a wildfire and/or to change the direction of force of the fire's convection column.
A portable sprayer with a hand pump, fed from a liquid-filled container fitted with straps and worn like a backpack, used mainly in fire and pest control. (See also Bladder Bag)
A collapsible bucket slung beneath a helicopter. Used to dip water or retardant from a variety of sources for fire suppression.
Biomass is any organic matter that is available on a renewable or recurring basis, including trees, plants and associated residues; plant fiber; poultry litter and other animal wastes; industrial waste; and the paper component of municipal waste.
Trees that are knocked down during a windthrow. There is controversy about what action should be taken when Blowdown occurs on forested lands, because some people want the blowdown trees to be left on the ground, but when these trees are not removed from the forests many times there is an infestation of beetles and other unwanted insect species that can weaken the surrounding forests.
A sudden increase in fire intensity or rate of spread strong enough to prevent direct control or to upset control plans. Blow-ups are often accompanied by violent convection and may have other characteristics of a fire storm. (See Flare-up.)
A collective term that refers to stands of vegetation dominated by shrubby, woody plants or low-growing trees, usually of a type undesirable for livestock or timber management.
An area of reduced vegetation that separates wildland areas from vulnerable residential or business developments. This barrier is similar to a greenbelt in that it is often used for another purpose such as agriculture or recreation, or parks or golf courses.
A progressive method of building a fireline on a wildfire without changing firefighters' relative positions in the line. Work is begun with a suitable space between firefighters. Whenever one overtakes another, all crew members ahead move one space forward and resume work on the uncompleted part of the line. The last in line does not move ahead until completing his or her section of line.
The state of the combined factors of the environment that affect fire behavior in a specified fuel type.
An estimate of the potential difficulty of fire containment as it relates to the flame length at the most rapidly spreading portion of a fire's perimeter.