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Unit 2: Fuels Classification

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Grass Group

Fuel Model Description Common Types/Species Fire Behavior
1. Short Grass Fire spread governed by the fine herbaceous fuels that have cured or are nearly cured. Very little, if any, shrubs or timber is present, generally less than one-third of the area. Best fits grasslands that are not grazed. Also consider savanna types, stubble grass with scattered shrubs, and grass tundra or low tussock with grasses. Surface fires that can burn very rapidly.
2. Timber (Grass and understory) Fire spread is primarily through fine herbaceous fuels, either curing or dead. In addition, litter and dead and down stemwood from open shrub or timber overstory contributes to fire intensity. Shrub or tree cover is approximately one-third to two-thirds of the area. Best fits open pine/grassy understory, wiregrass/scrub oak associations, but can be used for timber/sagebrush grass associations, some pinyon-juniper stands, and southern pine clearcut slash. Surface fires can spread easily. Clumps of fuels that generate higher intensities may produce firebrands.
3. Tall Grass (2 1/2) feet Fire spread is in tall stands of grass averaging about 3 feet where one-third or moreof stand is considered dead or cured. Fire may be carried by wind through the upper heights of grasses standing in water. Best fits tall sawgrasses, fountain grass, eastern marsh vegetation and other grasses such as bluebunch wheat-grass, bluestem, broomsage and panic-grass. Also consider wild or cultivated grains that haven't been harvested, and tall tussock/tundra grass situations. Fires in this fuel are the most intense of the grass group and display high rates of spread under the influence of wind.
Copyright 2008, by the Contributing Authors. Cite/attribute Resource . admin. (2005, October 05). Unit 2: Fuels Classification. Retrieved January 07, 2011, from Free Online Course Materials — USU OpenCourseWare Web site: This work is licensed under a Creative Commons License Creative Commons License