fire-danger-index
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Fire Danger Index (FDI)
Standards
the chance of a fire starting, its rate of spread, its intensity and the difficulty of its suppression, according to various combinations of air temperature, relative humidity, wind speed and both the long- and short-term drought effects
FDI in this Standard refers to the Forest Fire Danger Index calculated by the McArthur Mk 5 Forest Fire Danger Meter using the equations published by Noble, I.R., Bary, G.A.V, and Gill, A.M., 1980 (Ref. 5, Appendix B).
Grassland Fire Danger Index values are calculated by the McArthur Mk 4 Grassland Fire Danger Meter using the equations published by Purton, C.M., 1982 (Ref. 6 and Commentary CB2, Appendix B).
Source - AS 3959:2018: Construction of buildings in bushfire-prone areas