Bushfire Hazard Assessment Management Plan v2 - 434 Lake Cooroibah Rd Lake Cooroibah v1 · RAL26/0015

Bushfire Hazard Assessment & Management Plan v2                                       NCES REF: J001445
434 Lake Cooroibah Rd Lake Cooroibah, QLD


3.4 Forest Fire Danger Index (FFDI)
The McArthur Forest Fire Danger Index (or FFDI) is a weather based fire danger index used for
bushfire hazard assessments, emergency management and in regulations such as the Australian
Standard 3959–2018 Construction of buildings in bushfire-prone areas. The index integrates the
combined effect of a range of weather variables including long-term dryness, recent precipitation,
current wind speed, relative humidity and temperature. The FFDI tells us how dangerous the fire
weather is on a given day and therefore changes from season to season and week to week. FFDI
ranges from 0-100+ and informs Fire Danger ratings as follows:
    •    0-11 -No rating
    •    12-23 – Moderate
    •    24-49 –High
    •    50-99 – Extreme
    •    100+ Catastrophic
The FFDI is equivalent to a 5% annual exceedance probability (i.e. 5% chance of occurring in any
given year).
A FFDI of 47 has been assigned to the site by QFES (BRC Map Viewer Forest Fire Danger Rating
h20 layer (refer Plate 6)). This means there is a 1 in 20 chance (i.e. 5%) in any given year that the
FFDI will exceed 47 at the site.




                            Plate 6 – FFDI Rating h20 (Source: QFES BRC Map Viewer)




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