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The intensity figures previously calculated allow for an appreciation of fire intensity with respect to suppression thresholds. The following table shows approximate fire suppression thresholds in forests, based on 20 t/ha fuel load.

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Approximate fire suppression thresholds (forest based on 20t/ha)

The following table (Cheney and Sullivan, 1997) indicates levels of suppression difficulty in grassland. Although it pre-dates the introduction of ‘Severe’ and ‘Catastrophic’ to fire danger ratings, it indicates the increasing suppression difficulty as the index moves beyond ‘high’.

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Difficulty of suppression in grassland

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