Glossary of Terms
Fuels with no living tissue in which moisture content is governed almost entirely by atmospheric moisture ( relative humidity and precipitation), dry-bulb temperature, and solar radiation.
An area either natural or manmade where material capable of causing a fire to spread has been treated, cleared, reduced, or changed to act as a barrier between an advancing wildland fire and resources or lives at risk. In practice, defensible space is generally defined as an area of 30 feet or more around a structure that is cleared of flammable brush or vegetation or other fuels.
A facility from which resources are directly assigned to an incident.
A staff person who receives reports of discovery and status of fires, confirms their locations, receives orders for resources and takes action to provide people and equipment needed for control, and sends them to the designated locations.
Divisions are used to divide an incident into geographical areas of operation. Divisions are established when the number of resources exceeds the span-of-control of the operations chief. A division is located with the Incident Command System organization between the branch and the task force or strike team.
Any tracked vehicle with a front-mounted blade used for exposing mineral soil or constructing fireline or safety zones.
A hand-held device for igniting fires by dripping flaming liquid fuel onto the materials or area to be burned; consists of a fuel fount, burner arm, and igniter. The fuel used is generally a mixture of diesel and gasoline.
Target area for airtankers, helicopters, and cargo dropping.
A number representing the net effect of evaporation, transpiration, and precipitation in producing cumulative moisture depletion in deep duff or upper soil layers.