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Buildup Index (BUI)
Buildup Index (BUI)
The BUI measures the total amount of fuel available for combustion. It combines the Duff Moisture Code and Drought Code.
Color Value Category Description
 0 – 20Very LowMinimal fuel available. Little contribution to fire intensity.
 21 – 40LowSome fuel available. Moderate fire intensity possible.
 41 – 60ModerateSignificant fuel buildup. Higher fire intensity likely.
 61 – 80HighHeavy fuel load. Intense fire behavior expected.
 80+ExtremeExtreme fuel buildup. Maximum fire intensity. Deep burning likely.






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