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Terms and Definitions
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Dead Fuels
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.
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Debris Burning
A fire spreading from any fire originally set for the purpose of clearing land or for rubbish, garbage, range, stubble or meadow burning.
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Detection
The act or system of discovering and locating fires.
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Direct Attack
Any treatment of burning fuel, such as by wetting, smothering or chemically quenching the fire or by physically separating burning from unburned fuel.
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Dispatch
The implementation of a command decision to move a resource or resources from one place to another.
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Dispatch Center
A facility from which resources are directly assigned to an incident.
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Dispatcher
A person employed who receives reports of discovery and status of fires, confirms their locations, takes action promptly to provide people and equipment likely to be needed for control in first attack, and sends them to the proper place.
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Division
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 within the Incident Command System organization between the branch and the task force/strike team.
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Dozer
Any tracked vehicle with a front-mounted blade used for exposing mineral soil.
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Dozer Line
Fire line constructed by the front blade of a dozer.
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Drip Torch
Hand-held device for igniting fires by dripping flaming liquid fuel on the materials to be burned; consists of a fuel fount, burner arm and igniter. Fuel used is generally a mixture of diesel and gasoline.
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Drop Zone
Target area for air tankers, helitankers, and cargo dropping.
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Drought Index
A number representing net effect of evaporation, transpiration and precipitation in producing cumulative moisture depletion in deep duff or upper soil layers.
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Dry Lightning Storm
Thunderstorm in which negligible precipitation reaches the ground. Also called a dry storm.
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Duff
The layer of decomposing organic materials lying below the litter layer of freshly fallen twigs, needles and leaves and immediately above the mineral soil.
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