Fuel Model Attributes

TU5 (165)

The primary carrier of fire in TU5 is heavy forest litter with a shrub or small tree understory.  TU5 uses a humid type moisture of extinction and is not dynamic.

TU5 is often used to represent the more closed often decadent stand conditions with heavy dead and down fuels or shrubs. TU5 is used in the current LF fuels data in many EVT’s throughout the US. It is also used quite frequently as a model in disturbed areas that suffered heavy mortality to the overstory and after several years had no treatment.  

Fuel Model Statistics:

1-hr 10-hr 100-hr Live Herb Live Woody Fuel Model Type SAV Dead 1-hr SAV Live Herb SAVE Live Woody Fuel Bed Depth ft Dead Fuel Extinction Moisture Heat Content
4.00 4.00 3.00 0.00 3.00 N/A 1500 9999 750 1.0 25% 8000

Rate of Spread:
A series of graphs will look at TU5 rate of spread under average and more severe conditions with no cover, an open stand, and closed stand.

Flame Length:
TU5 is used as a fuel model mainly in the forested setting. This link will provide information on the canopy base height required for passive crown fire in average and dry fuel moisture conditions at windspeeds for open (15 – 30%), moderately closed (30- 50%), and closed canopy(>50%) situations. The resultant rate of spread for canopy fire is also displayed.