Reference Document - RAL26 0015 - Bushfire Hazard Assessment (As Published) · 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)




Document Set©ID:   24816699
                 2026                                              10
Version: 1, Version Date: 25/05/2026