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Journal of Combustion
Volume 2011, Article ID 263531, 11 pages
Research Article

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

1Ecole Nationale Forestière d'Ingénieurs, BP 511, Tabriquet, Salé 11015, Morocco
2Faculté des Sciences Rabat, Université Mohamed V, Agdal, Rabat, Morocco

Received 29 September 2010; Revised 25 March 2011; Accepted 5 May 2011

Academic Editor: D. Morvan

Copyright © 2011 M'Hamed Hachmi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A formula to estimate forest fuel flammability index (FI) is proposed, integrating three species flammability parameters: time to ignition, time of combustion, and flame height. Thirty-one (31) Moroccan tree and shrub species were tested within a wide range of fuel moisture contents. Six species flammability classes were identified. An ANOVA of the FI-values was performed and analyzed using four different sample sizes of 12, 24, 36, and 50 flammability tests. Fuel humidity content is inversely correlated to the FI-value, and the linear model appears to be the most adequate equation that may predict the hypothetical threshold-point of humidity of extinction. Most of the Moroccan forest fuels studied are classified as moderately flammable to flammable species based on their average humidity content, calculated for the summer period from July to September.