A Simple Technique to Estimate the Flammability Index of Moroccan Forest Fuels

Table 1

Flammability index (FI*) as a function of the ignition frequency (IF) and mean time to ignition (MTI) variables [22].

	IF (%)
MTI (s)	<50	50–79	80–84	85–89	90–94	>95
> 32.5	0	0	0	1	1	2
27.5<-≤32.5	0	0	1	1	2	2
22.5<-≤27.5	0	0	1	2	2	3
17.5<-≤22.5	0	1	2	2	3	3
12.5<-≤17.5	1	1	2	3	3	4
≤12.5	1	2	2	3	4	5

*Valette’s classification [22]: very little flammable (FI = 0), little flammable (FI = 1), moderately flammable (FI = 2), flammable (FI = 3), highly flammable (FI = 4), and extremely flammable (FI = 5).